Several methods of treating unhealthy cell in human tissue are used by the physicians. Transferring the heat to the infected cell is one of the methods to remove that cell. Point heating is an available technique to transfer heat to the infected cell. But in this technique, there is a possibility to damage the healthy tissue nearby the infected cell. Only controlling the temperature of the applicator cannot save the unhealthy tissue from damage. In this paper, the two dimensional finite code for bio-heat equation has been developed to measure the temperature during the treatment of point heating. Pennes bio heat equation is the main mathematical model for the transient heat transfer analysis considered in this research. Three cases of point heating techniques are considered to study the temperature profile of the tissue using the developed code. Those are constant point heating, step point heating and temperature controlled point heating. The tissue temperature controlled point heating is designed to restrict the healthy tissue temperature below the damage threshold temperature. Using the temperature profile, tissue damage rate is measured with the help of Arrhenius rate equation. Among these three techniques tissue temperature controlled point heating is shown as better one. The outcome of this research will be helpful for the physicians as well as bio-medical engineer.Several methods of treating unhealthy cell in human tissue are used by the physicians. Transferring the heat to the infected cell is one of the methods to remove that cell. Point heating is an available technique to transfer heat to the infected cell. But in this technique, there is a possibility to damage the healthy tissue nearby the infected cell. Only controlling the temperature of the applicator cannot save the unhealthy tissue from damage. In this paper, the two dimensional finite code for bio-heat equation has been developed to measure the temperature during the treatment of point heating. Pennes bio heat equation is the main mathematical model for the transient heat transfer analysis considered in this research. Three cases of point heating techniques are considered to study the temperature profile of the tissue using the developed code. Those are constant point heating, step point heating and temperature controlled point heating. The tissue temperature controlled point heating is designed to rest...
{"title":"Automatic controlling the tissue temperature during treatment of deep tumor: A numerical study using finite element method","authors":"Mridul Sannyal, A. Mukaddes","doi":"10.1063/1.5115899","DOIUrl":"https://doi.org/10.1063/1.5115899","url":null,"abstract":"Several methods of treating unhealthy cell in human tissue are used by the physicians. Transferring the heat to the infected cell is one of the methods to remove that cell. Point heating is an available technique to transfer heat to the infected cell. But in this technique, there is a possibility to damage the healthy tissue nearby the infected cell. Only controlling the temperature of the applicator cannot save the unhealthy tissue from damage. In this paper, the two dimensional finite code for bio-heat equation has been developed to measure the temperature during the treatment of point heating. Pennes bio heat equation is the main mathematical model for the transient heat transfer analysis considered in this research. Three cases of point heating techniques are considered to study the temperature profile of the tissue using the developed code. Those are constant point heating, step point heating and temperature controlled point heating. The tissue temperature controlled point heating is designed to restrict the healthy tissue temperature below the damage threshold temperature. Using the temperature profile, tissue damage rate is measured with the help of Arrhenius rate equation. Among these three techniques tissue temperature controlled point heating is shown as better one. The outcome of this research will be helpful for the physicians as well as bio-medical engineer.Several methods of treating unhealthy cell in human tissue are used by the physicians. Transferring the heat to the infected cell is one of the methods to remove that cell. Point heating is an available technique to transfer heat to the infected cell. But in this technique, there is a possibility to damage the healthy tissue nearby the infected cell. Only controlling the temperature of the applicator cannot save the unhealthy tissue from damage. In this paper, the two dimensional finite code for bio-heat equation has been developed to measure the temperature during the treatment of point heating. Pennes bio heat equation is the main mathematical model for the transient heat transfer analysis considered in this research. Three cases of point heating techniques are considered to study the temperature profile of the tissue using the developed code. Those are constant point heating, step point heating and temperature controlled point heating. The tissue temperature controlled point heating is designed to rest...","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131110385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Joardder, M. Masud, Shayban Nasif, Jakaria Abed Plabon, Sagit Hasan Chaklader
Drying is one of the oldest food preservation techniques associated simultaneous heat and mass transfer in order to extend the shelf-life of food materials. However, it is an energy intensive process and consumes about 20-25% of the energy used in the food processing industries. Developing of innovative drying system such as intermittent convective microwave (IMC) and utilization of renewable energy like solar energy in drying can be the potential solution of minimizing consumption of conventional energy in drying process. In this study, an innovative solar energy driven IMC dryer has been designed and fabricated. In addition to this, the effectiveness of this dryer over conventional drying process has been performed. Overall, the developed renewable energy based IMC drying shows better performance in energy consumption and quality aspect of the finish food product.
{"title":"Development and performance test of an innovative solar derived intermittent microwave convective food dryer","authors":"M. Joardder, M. Masud, Shayban Nasif, Jakaria Abed Plabon, Sagit Hasan Chaklader","doi":"10.1063/1.5115881","DOIUrl":"https://doi.org/10.1063/1.5115881","url":null,"abstract":"Drying is one of the oldest food preservation techniques associated simultaneous heat and mass transfer in order to extend the shelf-life of food materials. However, it is an energy intensive process and consumes about 20-25% of the energy used in the food processing industries. Developing of innovative drying system such as intermittent convective microwave (IMC) and utilization of renewable energy like solar energy in drying can be the potential solution of minimizing consumption of conventional energy in drying process. In this study, an innovative solar energy driven IMC dryer has been designed and fabricated. In addition to this, the effectiveness of this dryer over conventional drying process has been performed. Overall, the developed renewable energy based IMC drying shows better performance in energy consumption and quality aspect of the finish food product.","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131273483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Hasan, Md. Jahid Hasan Sagor, S. Barua, S. Saha
Conjugate natural convection heat transfer inside a prismatic enclosure with thick solid bottom wall has been investigated in the present study. The enclosure is filled with air and the solid bottom wall, made of pine wood, has finite thickness of t = 0.10L, where L is the length of the bottom wall of the enclosure. Three different cases such as isothermal, linear and sinusoidally varying heating conditions are applied at the bottom of the enclosure to examine the thermal performance and entropy generation inside the enclosure. The governing Navier-Stokes and energy equations are solved using finite element method. Parametric simulation is carried out for a range of Rayleigh number, 103 ≤ Ra ≤ 107 and the visualization of flow and thermal fields is presented through streamline, isotherm and entropy contour plots. The variations of average fluid temperature inside the enclosure, the average Nusselt number along the top of the thick bottom wall and the total entropy generation are also examined in order to assess the influence of the above three heating conditions.Conjugate natural convection heat transfer inside a prismatic enclosure with thick solid bottom wall has been investigated in the present study. The enclosure is filled with air and the solid bottom wall, made of pine wood, has finite thickness of t = 0.10L, where L is the length of the bottom wall of the enclosure. Three different cases such as isothermal, linear and sinusoidally varying heating conditions are applied at the bottom of the enclosure to examine the thermal performance and entropy generation inside the enclosure. The governing Navier-Stokes and energy equations are solved using finite element method. Parametric simulation is carried out for a range of Rayleigh number, 103 ≤ Ra ≤ 107 and the visualization of flow and thermal fields is presented through streamline, isotherm and entropy contour plots. The variations of average fluid temperature inside the enclosure, the average Nusselt number along the top of the thick bottom wall and the total entropy generation are also examined in order to ...
{"title":"Effect of heating condition on entropy generation of conjugate natural convection in a prismatic enclosure","authors":"A. Hasan, Md. Jahid Hasan Sagor, S. Barua, S. Saha","doi":"10.1063/1.5115846","DOIUrl":"https://doi.org/10.1063/1.5115846","url":null,"abstract":"Conjugate natural convection heat transfer inside a prismatic enclosure with thick solid bottom wall has been investigated in the present study. The enclosure is filled with air and the solid bottom wall, made of pine wood, has finite thickness of t = 0.10L, where L is the length of the bottom wall of the enclosure. Three different cases such as isothermal, linear and sinusoidally varying heating conditions are applied at the bottom of the enclosure to examine the thermal performance and entropy generation inside the enclosure. The governing Navier-Stokes and energy equations are solved using finite element method. Parametric simulation is carried out for a range of Rayleigh number, 103 ≤ Ra ≤ 107 and the visualization of flow and thermal fields is presented through streamline, isotherm and entropy contour plots. The variations of average fluid temperature inside the enclosure, the average Nusselt number along the top of the thick bottom wall and the total entropy generation are also examined in order to assess the influence of the above three heating conditions.Conjugate natural convection heat transfer inside a prismatic enclosure with thick solid bottom wall has been investigated in the present study. The enclosure is filled with air and the solid bottom wall, made of pine wood, has finite thickness of t = 0.10L, where L is the length of the bottom wall of the enclosure. Three different cases such as isothermal, linear and sinusoidally varying heating conditions are applied at the bottom of the enclosure to examine the thermal performance and entropy generation inside the enclosure. The governing Navier-Stokes and energy equations are solved using finite element method. Parametric simulation is carried out for a range of Rayleigh number, 103 ≤ Ra ≤ 107 and the visualization of flow and thermal fields is presented through streamline, isotherm and entropy contour plots. The variations of average fluid temperature inside the enclosure, the average Nusselt number along the top of the thick bottom wall and the total entropy generation are also examined in order to ...","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115168578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A numerical analysis has been carried out on combined magnetoconvection in a lid driven triangular enclosure with sinusoidal wavy bottom surface filled with hybrid nanofluid composed of equal quantities of Cu and Al2O3 nanoparticles dispersed in water-based fluid. The enclosure left vertical wall is heated while the inclined side of the cavity is cooled isothermally and the bottom wavy wall is insulated. A heat conducting horizontal circular cylinder has been placed at the middle of the enclosure. In this research, the relevant governing equations have been solved by using finite element method of Galerkin weighted residual approach. The implication of Richardson number and solid volume fraction of nanoparticles on the flow structure and heat transfer characteristics has been performed in details while the Reynolds number, Hartmann number and Prandtl number considered as fixed. Results have been presented in terms of streamlines, isotherms and average Nusselt number of the hybrid nanofluid for different values of governing parameters. The numerical results indicate that the Richardson number have significance effect on the flow and heat transfer performance. Moreover, it is noticed that combination of two different nanoparticles suspension has a better performance of heat transfer.
{"title":"Hybrid nanofluid flow in combined convective lid-driven sinusoidal triangular enclosure","authors":"I. Zahan, R. Nasrin, M. Alim","doi":"10.1063/1.5115908","DOIUrl":"https://doi.org/10.1063/1.5115908","url":null,"abstract":"A numerical analysis has been carried out on combined magnetoconvection in a lid driven triangular enclosure with sinusoidal wavy bottom surface filled with hybrid nanofluid composed of equal quantities of Cu and Al2O3 nanoparticles dispersed in water-based fluid. The enclosure left vertical wall is heated while the inclined side of the cavity is cooled isothermally and the bottom wavy wall is insulated. A heat conducting horizontal circular cylinder has been placed at the middle of the enclosure. In this research, the relevant governing equations have been solved by using finite element method of Galerkin weighted residual approach. The implication of Richardson number and solid volume fraction of nanoparticles on the flow structure and heat transfer characteristics has been performed in details while the Reynolds number, Hartmann number and Prandtl number considered as fixed. Results have been presented in terms of streamlines, isotherms and average Nusselt number of the hybrid nanofluid for different values of governing parameters. The numerical results indicate that the Richardson number have significance effect on the flow and heat transfer performance. Moreover, it is noticed that combination of two different nanoparticles suspension has a better performance of heat transfer.","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115695517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Md. Rakib Hossain, Md. Imran Hossain Talukder, M. Rahman
Among the different ways of achieving heat transfer enhancement in pool boiling, modification of surface roughness and the associated change in the surface wettability are two widely studied methods. It is well established that microstructure can play an important role in varying surface roughness and improving interfacial wettability. In the present study, pool boiling heat transfer on a number of micro grooved and flat (brass and copper) surfaces with water as the working fluid is investigated experimentally for enhancement of critical heat flux. The micro structured sample surfaces feature parallel grooves having dimensions of tens of microns and are fabricated using a mechanical micromachining process. Classical pool boiling experiments are conducted for three different values of heat flux (75 kw/m2, 100 kw/m2, 125 kw/m2). The bubble nucleation process is visualized and the bubble departure diameter is measured with the help of a high speed camera. It is observed that the nucleation site density and departing bubble diameter increases, while the bubble departure frequency decreases with an increasing heat flux for both kind of surfaces and materials. Comparison of the results among the flat and micro-grooved surfaces reveals that the boiling on micro-grooved surfaces results in higher heat transfer coefficient, more nucleation sites, lower bubble departure frequency and larger bubble diameter under similar operating conditions.Among the different ways of achieving heat transfer enhancement in pool boiling, modification of surface roughness and the associated change in the surface wettability are two widely studied methods. It is well established that microstructure can play an important role in varying surface roughness and improving interfacial wettability. In the present study, pool boiling heat transfer on a number of micro grooved and flat (brass and copper) surfaces with water as the working fluid is investigated experimentally for enhancement of critical heat flux. The micro structured sample surfaces feature parallel grooves having dimensions of tens of microns and are fabricated using a mechanical micromachining process. Classical pool boiling experiments are conducted for three different values of heat flux (75 kw/m2, 100 kw/m2, 125 kw/m2). The bubble nucleation process is visualized and the bubble departure diameter is measured with the help of a high speed camera. It is observed that the nucleation site density and d...
{"title":"Study of pool boiling on flat and micro-grooved brass and copper surfaces","authors":"Md. Rakib Hossain, Md. Imran Hossain Talukder, M. Rahman","doi":"10.1063/1.5115857","DOIUrl":"https://doi.org/10.1063/1.5115857","url":null,"abstract":"Among the different ways of achieving heat transfer enhancement in pool boiling, modification of surface roughness and the associated change in the surface wettability are two widely studied methods. It is well established that microstructure can play an important role in varying surface roughness and improving interfacial wettability. In the present study, pool boiling heat transfer on a number of micro grooved and flat (brass and copper) surfaces with water as the working fluid is investigated experimentally for enhancement of critical heat flux. The micro structured sample surfaces feature parallel grooves having dimensions of tens of microns and are fabricated using a mechanical micromachining process. Classical pool boiling experiments are conducted for three different values of heat flux (75 kw/m2, 100 kw/m2, 125 kw/m2). The bubble nucleation process is visualized and the bubble departure diameter is measured with the help of a high speed camera. It is observed that the nucleation site density and departing bubble diameter increases, while the bubble departure frequency decreases with an increasing heat flux for both kind of surfaces and materials. Comparison of the results among the flat and micro-grooved surfaces reveals that the boiling on micro-grooved surfaces results in higher heat transfer coefficient, more nucleation sites, lower bubble departure frequency and larger bubble diameter under similar operating conditions.Among the different ways of achieving heat transfer enhancement in pool boiling, modification of surface roughness and the associated change in the surface wettability are two widely studied methods. It is well established that microstructure can play an important role in varying surface roughness and improving interfacial wettability. In the present study, pool boiling heat transfer on a number of micro grooved and flat (brass and copper) surfaces with water as the working fluid is investigated experimentally for enhancement of critical heat flux. The micro structured sample surfaces feature parallel grooves having dimensions of tens of microns and are fabricated using a mechanical micromachining process. Classical pool boiling experiments are conducted for three different values of heat flux (75 kw/m2, 100 kw/m2, 125 kw/m2). The bubble nucleation process is visualized and the bubble departure diameter is measured with the help of a high speed camera. It is observed that the nucleation site density and d...","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129064761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
During past few decades, being amazed by the excellent silent flight of owl, scientists have been trying to demystify the unique features in its wing feathers. Our present study is dedicated to take our understanding further on this phenomenon. In this present study, a numerical investigation was performed to analyse how the shape of the leading-edge serration at owl wing feathers effects the flow induced noise generation. For the analysis, an owl inspired single feather wing model was prepared for both with and without serrations at the leading edge. The serration profiles were taken at different positions of the vane length for a single feather. Broadband noise was studied to quantify the local contribution to the total acoustic power generated by the flow, where the results clearly showed the effect of serrations in reducing the noise generation. It was also clearly visible that the shape of the serration has a very strong influence on noise generation. The frequency spectrum of noise was also analysed and a strong relation was found between the shape of the serration and the noise generation. It showed that, the noise suppression is strongly influenced by the height to length ratio of the serration. With the increase of height to length ratio the noise suppression is enhanced further.During past few decades, being amazed by the excellent silent flight of owl, scientists have been trying to demystify the unique features in its wing feathers. Our present study is dedicated to take our understanding further on this phenomenon. In this present study, a numerical investigation was performed to analyse how the shape of the leading-edge serration at owl wing feathers effects the flow induced noise generation. For the analysis, an owl inspired single feather wing model was prepared for both with and without serrations at the leading edge. The serration profiles were taken at different positions of the vane length for a single feather. Broadband noise was studied to quantify the local contribution to the total acoustic power generated by the flow, where the results clearly showed the effect of serrations in reducing the noise generation. It was also clearly visible that the shape of the serration has a very strong influence on noise generation. The frequency spectrum of noise was also analysed...
{"title":"The effect of leading-edge serration at owl wing feathers on flow induced noise generation","authors":"S. Islam, Sifat Ullah Tanzil","doi":"10.1063/1.5115902","DOIUrl":"https://doi.org/10.1063/1.5115902","url":null,"abstract":"During past few decades, being amazed by the excellent silent flight of owl, scientists have been trying to demystify the unique features in its wing feathers. Our present study is dedicated to take our understanding further on this phenomenon. In this present study, a numerical investigation was performed to analyse how the shape of the leading-edge serration at owl wing feathers effects the flow induced noise generation. For the analysis, an owl inspired single feather wing model was prepared for both with and without serrations at the leading edge. The serration profiles were taken at different positions of the vane length for a single feather. Broadband noise was studied to quantify the local contribution to the total acoustic power generated by the flow, where the results clearly showed the effect of serrations in reducing the noise generation. It was also clearly visible that the shape of the serration has a very strong influence on noise generation. The frequency spectrum of noise was also analysed and a strong relation was found between the shape of the serration and the noise generation. It showed that, the noise suppression is strongly influenced by the height to length ratio of the serration. With the increase of height to length ratio the noise suppression is enhanced further.During past few decades, being amazed by the excellent silent flight of owl, scientists have been trying to demystify the unique features in its wing feathers. Our present study is dedicated to take our understanding further on this phenomenon. In this present study, a numerical investigation was performed to analyse how the shape of the leading-edge serration at owl wing feathers effects the flow induced noise generation. For the analysis, an owl inspired single feather wing model was prepared for both with and without serrations at the leading edge. The serration profiles were taken at different positions of the vane length for a single feather. Broadband noise was studied to quantify the local contribution to the total acoustic power generated by the flow, where the results clearly showed the effect of serrations in reducing the noise generation. It was also clearly visible that the shape of the serration has a very strong influence on noise generation. The frequency spectrum of noise was also analysed...","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128744960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Asekin, F. Tabassum, R. Shakif, M. S. Kaiser, S. R. Ahmed
The optimization of some processing and post-processing conditions is experimentally investigated for the improved physical and mechanical properties of a jute-fiber reinforced polymer composite. The individual effects of pressure and temperature as well as their combined effect have been investigated during processing of the composite. The polyester resin based natural fiber composite samples are then thermally aged at different temperatures ranging from 0 to 250°C for a period of one hour. The results show that temperature induced processing of the polymer based composite leads to better mechanical properties compared to the other conditions. This thermal treatment during processing allows the composite to enjoy the curing effect as well as avoid part distortion caused by uneven expansion and contraction. Furthermore, the major physical and mechanical properties are found to improve more when the composite samples are thermally aged at a temperature of around 125°C. The investigation of optical images reveals that the original color of the composite samples remains unchanged up to an ageing temperature of 100°C, however, thermal degradation of the composites becomes evident in terms of both color and mechanical properties when the samples are aged beyond 200°C. The comparison of micro structural images of the samples obtained at room temperature and 125°C also verifies the improvement of micro structures, thereby leading to improved physical and mechanical properties of the present biodegradable fiber reinforced composites.The optimization of some processing and post-processing conditions is experimentally investigated for the improved physical and mechanical properties of a jute-fiber reinforced polymer composite. The individual effects of pressure and temperature as well as their combined effect have been investigated during processing of the composite. The polyester resin based natural fiber composite samples are then thermally aged at different temperatures ranging from 0 to 250°C for a period of one hour. The results show that temperature induced processing of the polymer based composite leads to better mechanical properties compared to the other conditions. This thermal treatment during processing allows the composite to enjoy the curing effect as well as avoid part distortion caused by uneven expansion and contraction. Furthermore, the major physical and mechanical properties are found to improve more when the composite samples are thermally aged at a temperature of around 125°C. The investigation of optical images r...
{"title":"Optimization of processing and post-processing conditions for improved properties of jute-fiber reinforced polymer composites","authors":"R. Asekin, F. Tabassum, R. Shakif, M. S. Kaiser, S. R. Ahmed","doi":"10.1063/1.5115962","DOIUrl":"https://doi.org/10.1063/1.5115962","url":null,"abstract":"The optimization of some processing and post-processing conditions is experimentally investigated for the improved physical and mechanical properties of a jute-fiber reinforced polymer composite. The individual effects of pressure and temperature as well as their combined effect have been investigated during processing of the composite. The polyester resin based natural fiber composite samples are then thermally aged at different temperatures ranging from 0 to 250°C for a period of one hour. The results show that temperature induced processing of the polymer based composite leads to better mechanical properties compared to the other conditions. This thermal treatment during processing allows the composite to enjoy the curing effect as well as avoid part distortion caused by uneven expansion and contraction. Furthermore, the major physical and mechanical properties are found to improve more when the composite samples are thermally aged at a temperature of around 125°C. The investigation of optical images reveals that the original color of the composite samples remains unchanged up to an ageing temperature of 100°C, however, thermal degradation of the composites becomes evident in terms of both color and mechanical properties when the samples are aged beyond 200°C. The comparison of micro structural images of the samples obtained at room temperature and 125°C also verifies the improvement of micro structures, thereby leading to improved physical and mechanical properties of the present biodegradable fiber reinforced composites.The optimization of some processing and post-processing conditions is experimentally investigated for the improved physical and mechanical properties of a jute-fiber reinforced polymer composite. The individual effects of pressure and temperature as well as their combined effect have been investigated during processing of the composite. The polyester resin based natural fiber composite samples are then thermally aged at different temperatures ranging from 0 to 250°C for a period of one hour. The results show that temperature induced processing of the polymer based composite leads to better mechanical properties compared to the other conditions. This thermal treatment during processing allows the composite to enjoy the curing effect as well as avoid part distortion caused by uneven expansion and contraction. Furthermore, the major physical and mechanical properties are found to improve more when the composite samples are thermally aged at a temperature of around 125°C. The investigation of optical images r...","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"416 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116401554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Patnaik, H. Stauffer, P. Hsu, N. Jiang, P. Wrzesinski, S. Roy
Optical measurement techniques have become powerful tools for the detailed study of the chemistry and physics of reacting flows, and plasmas. Traditional combustion diagnostics based on continuous-wave and low-repetition-rate ns- pulsed lasers continue to dominate fundamental studies and applications; however, revolutionary advances in the science and engineering of both ultrashort-pulse (femtosecond) lasers and high-repetition-rate (burst-mode) lasers are driving the advancement of existing diagnostic techniques and enabling the development of new measurement approaches. The ultrashort pulses afforded by femtosecond laser systems provide tremendous peak powers—allowing nonlinear signal generation with broad spectral coverage—and unprecedented temporal resolution for studying chemical kinetics and dynamics. The high pulse-repetition rates of ultrashort-pulse amplifiers as well as ns- and ps-pulse burst-mode lasers allow previously unachievable data-acquisition bandwidths for the study of turbulent time series and combustion instabilities. More importantly, the high pulse energies emanating from these advanced laser systems afford the ability to extend measurement capabilities beyond point-wise measurements to multi-dimensional (line [1D], planar [2D], or even volumetric [3D]) imaging. The rapid growth of ultrafast laser-based spectroscopic measurements has been fueled by the need to achieve the following: 1) time-resolved single-shot measurements 2) simultaneous detection of multiple species, 3) spatially resolved measurements, 4) interference-free measurements (collisional broadening, photolytic dissociation, etc.), and 5) higher dimensionality (line, planar, or volumetric). Several state-of-art ultrafast-laser–based spectroscopic techniques and their remarkable developments will be reviewed in meeting one or all of the above five needs for measurements of temperature and key chemical species concentrations in reacting flows and plasmas.Optical measurement techniques have become powerful tools for the detailed study of the chemistry and physics of reacting flows, and plasmas. Traditional combustion diagnostics based on continuous-wave and low-repetition-rate ns- pulsed lasers continue to dominate fundamental studies and applications; however, revolutionary advances in the science and engineering of both ultrashort-pulse (femtosecond) lasers and high-repetition-rate (burst-mode) lasers are driving the advancement of existing diagnostic techniques and enabling the development of new measurement approaches. The ultrashort pulses afforded by femtosecond laser systems provide tremendous peak powers—allowing nonlinear signal generation with broad spectral coverage—and unprecedented temporal resolution for studying chemical kinetics and dynamics. The high pulse-repetition rates of ultrashort-pulse amplifiers as well as ns- and ps-pulse burst-mode lasers allow previously unachievable data-acquisition bandwidths for the study of turbulent time se...
{"title":"Ultrafast diagnostics of reacting flows and plasmas","authors":"A. Patnaik, H. Stauffer, P. Hsu, N. Jiang, P. Wrzesinski, S. Roy","doi":"10.1063/1.5115844","DOIUrl":"https://doi.org/10.1063/1.5115844","url":null,"abstract":"Optical measurement techniques have become powerful tools for the detailed study of the chemistry and physics of reacting flows, and plasmas. Traditional combustion diagnostics based on continuous-wave and low-repetition-rate ns- pulsed lasers continue to dominate fundamental studies and applications; however, revolutionary advances in the science and engineering of both ultrashort-pulse (femtosecond) lasers and high-repetition-rate (burst-mode) lasers are driving the advancement of existing diagnostic techniques and enabling the development of new measurement approaches. The ultrashort pulses afforded by femtosecond laser systems provide tremendous peak powers—allowing nonlinear signal generation with broad spectral coverage—and unprecedented temporal resolution for studying chemical kinetics and dynamics. The high pulse-repetition rates of ultrashort-pulse amplifiers as well as ns- and ps-pulse burst-mode lasers allow previously unachievable data-acquisition bandwidths for the study of turbulent time series and combustion instabilities. More importantly, the high pulse energies emanating from these advanced laser systems afford the ability to extend measurement capabilities beyond point-wise measurements to multi-dimensional (line [1D], planar [2D], or even volumetric [3D]) imaging. The rapid growth of ultrafast laser-based spectroscopic measurements has been fueled by the need to achieve the following: 1) time-resolved single-shot measurements 2) simultaneous detection of multiple species, 3) spatially resolved measurements, 4) interference-free measurements (collisional broadening, photolytic dissociation, etc.), and 5) higher dimensionality (line, planar, or volumetric). Several state-of-art ultrafast-laser–based spectroscopic techniques and their remarkable developments will be reviewed in meeting one or all of the above five needs for measurements of temperature and key chemical species concentrations in reacting flows and plasmas.Optical measurement techniques have become powerful tools for the detailed study of the chemistry and physics of reacting flows, and plasmas. Traditional combustion diagnostics based on continuous-wave and low-repetition-rate ns- pulsed lasers continue to dominate fundamental studies and applications; however, revolutionary advances in the science and engineering of both ultrashort-pulse (femtosecond) lasers and high-repetition-rate (burst-mode) lasers are driving the advancement of existing diagnostic techniques and enabling the development of new measurement approaches. The ultrashort pulses afforded by femtosecond laser systems provide tremendous peak powers—allowing nonlinear signal generation with broad spectral coverage—and unprecedented temporal resolution for studying chemical kinetics and dynamics. The high pulse-repetition rates of ultrashort-pulse amplifiers as well as ns- and ps-pulse burst-mode lasers allow previously unachievable data-acquisition bandwidths for the study of turbulent time se...","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125749970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Md. Tariqul Islam, Samit Chowdhury, M. Islam, Md. Sakhawat Hossain
The process of heat generation or absorption in metals under stress is caused by intermolecular interaction taken place after applying external force. Quantity of generated or absorbed heat depends on the magnitude of the applied force and the induced stress. The relationship between the heat and stress is one of the basic material property that determines the failure of that specific metal. So, it is important to know the relationship between the stress and formation of heat in material while designing a product. Two basic parameters, material property and induced stress, determine the quantity of generated or absorbed heat. Again, induced stress determines the fact if heat would be absorbed or be generated. No significant and to the point research work has been found about this subject, hence the aim of this study is to observe the generation of heat in different metals under different types of load condition. For the analysis, the chosen metals were Cast iron, Aluminum, AISI 4340 and Structural steel. These metals were chosen because of being widely used as engineering metals. The applied load conditions for the experiment were tension, compression and bending. The analysis was conducted using finite element technique in ComsolMultiphysics 5.3. The geometry of the metal was designed in Solidworks Premium 2016 and then imported in thermoelastic physics interface of ComsolMultiphysics. The loading conditions were varied to determine the relationship between the stress and generated heat and later compared with each other. The results show that the rate of generation of heat for AISI 4340 is greater than other metals at its ultimate strength. The temperature distribution shows that, the dissipation of temperature throughout the specimen is greater in aluminum than other three metals. These results will be useful in choosing metals that are to be used for fabricating devices employed in dynamic load condition.The process of heat generation or absorption in metals under stress is caused by intermolecular interaction taken place after applying external force. Quantity of generated or absorbed heat depends on the magnitude of the applied force and the induced stress. The relationship between the heat and stress is one of the basic material property that determines the failure of that specific metal. So, it is important to know the relationship between the stress and formation of heat in material while designing a product. Two basic parameters, material property and induced stress, determine the quantity of generated or absorbed heat. Again, induced stress determines the fact if heat would be absorbed or be generated. No significant and to the point research work has been found about this subject, hence the aim of this study is to observe the generation of heat in different metals under different types of load condition. For the analysis, the chosen metals were Cast iron, Aluminum, AISI 4340 and Structural steel. ...
{"title":"A comparative study of heat formation in various metals due to different types of stresses using finite element analysis","authors":"Md. Tariqul Islam, Samit Chowdhury, M. Islam, Md. Sakhawat Hossain","doi":"10.1063/1.5115960","DOIUrl":"https://doi.org/10.1063/1.5115960","url":null,"abstract":"The process of heat generation or absorption in metals under stress is caused by intermolecular interaction taken place after applying external force. Quantity of generated or absorbed heat depends on the magnitude of the applied force and the induced stress. The relationship between the heat and stress is one of the basic material property that determines the failure of that specific metal. So, it is important to know the relationship between the stress and formation of heat in material while designing a product. Two basic parameters, material property and induced stress, determine the quantity of generated or absorbed heat. Again, induced stress determines the fact if heat would be absorbed or be generated. No significant and to the point research work has been found about this subject, hence the aim of this study is to observe the generation of heat in different metals under different types of load condition. For the analysis, the chosen metals were Cast iron, Aluminum, AISI 4340 and Structural steel. These metals were chosen because of being widely used as engineering metals. The applied load conditions for the experiment were tension, compression and bending. The analysis was conducted using finite element technique in ComsolMultiphysics 5.3. The geometry of the metal was designed in Solidworks Premium 2016 and then imported in thermoelastic physics interface of ComsolMultiphysics. The loading conditions were varied to determine the relationship between the stress and generated heat and later compared with each other. The results show that the rate of generation of heat for AISI 4340 is greater than other metals at its ultimate strength. The temperature distribution shows that, the dissipation of temperature throughout the specimen is greater in aluminum than other three metals. These results will be useful in choosing metals that are to be used for fabricating devices employed in dynamic load condition.The process of heat generation or absorption in metals under stress is caused by intermolecular interaction taken place after applying external force. Quantity of generated or absorbed heat depends on the magnitude of the applied force and the induced stress. The relationship between the heat and stress is one of the basic material property that determines the failure of that specific metal. So, it is important to know the relationship between the stress and formation of heat in material while designing a product. Two basic parameters, material property and induced stress, determine the quantity of generated or absorbed heat. Again, induced stress determines the fact if heat would be absorbed or be generated. No significant and to the point research work has been found about this subject, hence the aim of this study is to observe the generation of heat in different metals under different types of load condition. For the analysis, the chosen metals were Cast iron, Aluminum, AISI 4340 and Structural steel. ...","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115901070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abdullah Al Rafi, R. Haque, Faizan Sikandar, Nurul Absar Chowdhury
The present work shows the heat transfer potential of Al2O3 /Water-Ethylene Glycol (EG) and CuO/Water-EG as coolants for car radiators. Generally in automobile Water-EG is used in radiators for coo...
{"title":"Experimental analysis of heat transfer with CuO, Al2O3/water-ethylene glycol nanofluids in automobile radiator","authors":"Abdullah Al Rafi, R. Haque, Faizan Sikandar, Nurul Absar Chowdhury","doi":"10.1063/1.5115878","DOIUrl":"https://doi.org/10.1063/1.5115878","url":null,"abstract":"The present work shows the heat transfer potential of Al2O3 /Water-Ethylene Glycol (EG) and CuO/Water-EG as coolants for car radiators. Generally in automobile Water-EG is used in radiators for coo...","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123747320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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