The rolling of a metal or its alloy has close association with the thermo-mechanical properties, and this phenomenon is important for conducting materials as these materials need to maintain thermal or electrical conductivity along with desirable tensile properties for their useful life. It necessitates looking for the relationship between rolling condition and aging temperature of conductive materials to establish the influences on their mechanical properties. As such, the present research is an attempt to investigate the effect of thermal aging on the mechanical properties and microstructure of commercially available high conductive material. Here, the samples are prepared from copper ingots and copper based alloy collected from local market. From the bulk material, long bars are taken, and they are at first homogenized and then solution treated. Some of the bars are kept free from rolling and others are rolled in two conditions. Few bars are rolled at room temperature to reduce the thickness by 80% and few bars are hot rolled by 40% and then cold rolled by further 40% making final reduction by 80%. Then a series of experiments are carried out to determine the changes in micro-hardness, strength, elongation and microstructure of samples as a function of thermal aging temperature. Most of the mechanical properties after thermal aging are found to be influenced quite significantly by the condition of rolling.
{"title":"Effect of thermal ageing on the tensile properties of hot and cold rolled commercial high conductive metal and its alloy","authors":"M. M. Rahman, M. S. Kaiser, S. R. Ahmed","doi":"10.1063/1.5115955","DOIUrl":"https://doi.org/10.1063/1.5115955","url":null,"abstract":"The rolling of a metal or its alloy has close association with the thermo-mechanical properties, and this phenomenon is important for conducting materials as these materials need to maintain thermal or electrical conductivity along with desirable tensile properties for their useful life. It necessitates looking for the relationship between rolling condition and aging temperature of conductive materials to establish the influences on their mechanical properties. As such, the present research is an attempt to investigate the effect of thermal aging on the mechanical properties and microstructure of commercially available high conductive material. Here, the samples are prepared from copper ingots and copper based alloy collected from local market. From the bulk material, long bars are taken, and they are at first homogenized and then solution treated. Some of the bars are kept free from rolling and others are rolled in two conditions. Few bars are rolled at room temperature to reduce the thickness by 80% and few bars are hot rolled by 40% and then cold rolled by further 40% making final reduction by 80%. Then a series of experiments are carried out to determine the changes in micro-hardness, strength, elongation and microstructure of samples as a function of thermal aging temperature. Most of the mechanical properties after thermal aging are found to be influenced quite significantly by the condition of rolling.","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"150 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":"133947811","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}
Micropump has many attractive features which make them potential for use in biomedical engineering and in a number of miniature technologies. In this study, the effects of geometric parameters on the performance of a viscous micropump consisting of two counter rotating cylinders have been investigated using 3D laminar simulations. These cylinders are placed symmetrically at vertical position inside the micropump. To capture the flow field, the Navier-Stokes equations have been computed based on Finite Volume Method (FVM). Numerical results have been validated with available experimental data for the case of a single rotor micropump. The performance of the viscous micropump was studied in terms of the dimensionless average velocity, driving power and efficiency. To study the effect of geometric parameters, various pumps were simulated by varying the cylinders position, channel height and channel width. Numerical result shows that geometric parameters play a significant role on the pump performance. It is found that for a given pump geometry and operating conditions, there is an optimal cylinder position that results in maximum pump efficiency. Besides, the effect of channel width is found insignificant on the pump performance when the channel width is 20 times the cylinder diameter.Micropump has many attractive features which make them potential for use in biomedical engineering and in a number of miniature technologies. In this study, the effects of geometric parameters on the performance of a viscous micropump consisting of two counter rotating cylinders have been investigated using 3D laminar simulations. These cylinders are placed symmetrically at vertical position inside the micropump. To capture the flow field, the Navier-Stokes equations have been computed based on Finite Volume Method (FVM). Numerical results have been validated with available experimental data for the case of a single rotor micropump. The performance of the viscous micropump was studied in terms of the dimensionless average velocity, driving power and efficiency. To study the effect of geometric parameters, various pumps were simulated by varying the cylinders position, channel height and channel width. Numerical result shows that geometric parameters play a significant role on the pump performance. It is f...
{"title":"Effects of geometric parameters on the performance of a viscous micropump with dual rotating cylinders","authors":"Md Nurunnabi Mondal, A. Hasan","doi":"10.1063/1.5115887","DOIUrl":"https://doi.org/10.1063/1.5115887","url":null,"abstract":"Micropump has many attractive features which make them potential for use in biomedical engineering and in a number of miniature technologies. In this study, the effects of geometric parameters on the performance of a viscous micropump consisting of two counter rotating cylinders have been investigated using 3D laminar simulations. These cylinders are placed symmetrically at vertical position inside the micropump. To capture the flow field, the Navier-Stokes equations have been computed based on Finite Volume Method (FVM). Numerical results have been validated with available experimental data for the case of a single rotor micropump. The performance of the viscous micropump was studied in terms of the dimensionless average velocity, driving power and efficiency. To study the effect of geometric parameters, various pumps were simulated by varying the cylinders position, channel height and channel width. Numerical result shows that geometric parameters play a significant role on the pump performance. It is found that for a given pump geometry and operating conditions, there is an optimal cylinder position that results in maximum pump efficiency. Besides, the effect of channel width is found insignificant on the pump performance when the channel width is 20 times the cylinder diameter.Micropump has many attractive features which make them potential for use in biomedical engineering and in a number of miniature technologies. In this study, the effects of geometric parameters on the performance of a viscous micropump consisting of two counter rotating cylinders have been investigated using 3D laminar simulations. These cylinders are placed symmetrically at vertical position inside the micropump. To capture the flow field, the Navier-Stokes equations have been computed based on Finite Volume Method (FVM). Numerical results have been validated with available experimental data for the case of a single rotor micropump. The performance of the viscous micropump was studied in terms of the dimensionless average velocity, driving power and efficiency. To study the effect of geometric parameters, various pumps were simulated by varying the cylinders position, channel height and channel width. Numerical result shows that geometric parameters play a significant role on the pump performance. It is f...","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"288 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":"115603276","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. Huq, Mahmudur Rahman, A. Islam, Md. Nurul Absar Chowdhury
In view of the severe power crisis in Bangladesh, the government decided to use the quick rental power plants (QRPPs) as its important strategic technique to reduce power shortage in the shortest possible time. Under this strategy, several QRPPs were commissioned with a total capacity of more than 1000 MW. All the quick rental power plants are based on reciprocating engines. About 35.52 % of total generation capacity around 17,043 MW comes from reciprocating engine power plant. The goal of this paper is to perform a life cycle analysis of a 10.2 MW natural gas fired reciprocating engine (RE) power plant, which is being operated to supply electric power to a cement factory, Seven Circle Cement Company at Ghorasal, Narsingdi. The study reveals that the direct combustion of natural gas during the operational phase consumes maximum energy at 91.36% and the contribution of hidden processes is about 9%. Out of this 9%, the production of materials, manufacturing of equipmentand transportation is 0.50%, plant operation and maintenance 0.22%, and fuel cycle 7.91% of the total life cycle energy inputs. However, the energy consumption in decommissioning phases is negligible. This study also reveals that the major GHG emission is accounted for direct combustion of the fuel during operation of the power plant. The total GHG emissions from the 10.2 MW Reciprocating Engine (RE) power plant was estimated to be 672.22 g-CO2eq/kWh with the lifecycle efficiency of 34.21% and plant fuel efficiency of 37.45%.
鉴于孟加拉国严重的电力危机，政府决定将快速租赁电厂(QRPPs)作为其重要的战略技术，以在最短的时间内减少电力短缺。在这一战略下，几个总容量超过1000兆瓦的qrpp投入使用。所有的快速租赁发电厂都是基于往复式发动机。往复发动机发电厂的发电量约占总发电量的35.52%，约为17043兆瓦。本文的目标是对10.2 MW天然气往复式发动机(RE)发电厂进行生命周期分析，该发电厂正在运行，为位于Narsingdi Ghorasal的水泥厂Seven Circle cement Company提供电力。研究表明，运行阶段天然气直接燃烧能耗最大，为91.36%，隐藏过程贡献约9%。在这9%的能源投入中，材料的生产、设备的制造和运输占0.50%，工厂的运行和维护占0.22%，燃料循环占7.91%。然而，退役阶段的能源消耗可以忽略不计。该研究还表明，主要的温室气体排放是在电厂运行过程中燃料的直接燃烧。10.2 MW往复式发动机(RE)电厂的总温室气体排放量估计为672.22 g-CO2eq/kWh，生命周期效率为34.21%，工厂燃油效率为37.45%。
{"title":"Life cycle assessment of a reciprocating engine power plant in Bangladesh","authors":"M. Huq, Mahmudur Rahman, A. Islam, Md. Nurul Absar Chowdhury","doi":"10.1063/1.5115937","DOIUrl":"https://doi.org/10.1063/1.5115937","url":null,"abstract":"In view of the severe power crisis in Bangladesh, the government decided to use the quick rental power plants (QRPPs) as its important strategic technique to reduce power shortage in the shortest possible time. Under this strategy, several QRPPs were commissioned with a total capacity of more than 1000 MW. All the quick rental power plants are based on reciprocating engines. About 35.52 % of total generation capacity around 17,043 MW comes from reciprocating engine power plant. The goal of this paper is to perform a life cycle analysis of a 10.2 MW natural gas fired reciprocating engine (RE) power plant, which is being operated to supply electric power to a cement factory, Seven Circle Cement Company at Ghorasal, Narsingdi. The study reveals that the direct combustion of natural gas during the operational phase consumes maximum energy at 91.36% and the contribution of hidden processes is about 9%. Out of this 9%, the production of materials, manufacturing of equipmentand transportation is 0.50%, plant operation and maintenance 0.22%, and fuel cycle 7.91% of the total life cycle energy inputs. However, the energy consumption in decommissioning phases is negligible. This study also reveals that the major GHG emission is accounted for direct combustion of the fuel during operation of the power plant. The total GHG emissions from the 10.2 MW Reciprocating Engine (RE) power plant was estimated to be 672.22 g-CO2eq/kWh with the lifecycle efficiency of 34.21% and plant fuel efficiency of 37.45%.","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"54 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":"114558157","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}
Sk. Reza-E- Rabbi, S. M. Arifuzzaman, T. Sarkar, Md. Shakhaoath Khan, S. Ahmmed
{"title":"Periodic magnetohydrodynamic simulation of Newtonian and non-Newtonian fluids flow behavior past a stretching sheet with nanoparticles","authors":"Sk. Reza-E- Rabbi, S. M. Arifuzzaman, T. Sarkar, Md. Shakhaoath Khan, S. Ahmmed","doi":"10.1063/1.5115913","DOIUrl":"https://doi.org/10.1063/1.5115913","url":null,"abstract":"","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"59 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":"122861630","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. Alif Khan, R. Karmakar, M. Sarker, S. S. Tuly, R. A. Beg
Solar distillation is one of the significant methods of getting fresh water from brackish and sea water by using free energy source from the sun. This is considered as the best solution for water production in remote, barren to semi- barren, small communities where fresh water is inaccessible. An experimental investigation is performed on a single slope solar still in the weather of Rajshahi, Bangladesh. The main purpose of this study is to evaluate the effect of phase change material (PCM) in a solar still and thus enhance its productivity. A single slope solar still with a basin area of 0.44105m2 is designed and constructed for this investigation. In this study,Bitumen has been used as phase change material to store thermal energy in the form of latent heat which offersgreat storage capacity per unit volume and per unit mass and provides heat during sunshine-off period. Results show that the efficiency of current solar still with PCM is comparatively higher than that of the still without PCM.
{"title":"Experimental investigation of single basin solar still using phase change material (PCM) as an energy storage medium","authors":"Md. Alif Khan, R. Karmakar, M. Sarker, S. S. Tuly, R. A. Beg","doi":"10.1063/1.5115939","DOIUrl":"https://doi.org/10.1063/1.5115939","url":null,"abstract":"Solar distillation is one of the significant methods of getting fresh water from brackish and sea water by using free energy source from the sun. This is considered as the best solution for water production in remote, barren to semi- barren, small communities where fresh water is inaccessible. An experimental investigation is performed on a single slope solar still in the weather of Rajshahi, Bangladesh. The main purpose of this study is to evaluate the effect of phase change material (PCM) in a solar still and thus enhance its productivity. A single slope solar still with a basin area of 0.44105m2 is designed and constructed for this investigation. In this study,Bitumen has been used as phase change material to store thermal energy in the form of latent heat which offersgreat storage capacity per unit volume and per unit mass and provides heat during sunshine-off period. Results show that the efficiency of current solar still with PCM is comparatively higher than that of the still without PCM.","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":"131328650","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}
J. Kasahara, A. Kawasaki, K. Matsuoka, A. Matsuo, I. Funaki, D. Nakata, M. Uchiumi
A detonation is a combustion wave that propagates at supersonic speed (2∼3 km/s) in a combustible mixture. There are many fundamental studies of detonation waves and detonation engine systems. The detonation cycle has a higher thermal efficiency than a conventional constant-pressure combustion cycle. Therefore, it is expected that a high-efficiency propulsion system can be realized using detonation waves.A rotating detonation engine (RDE) uses continuous detonation propagating at a bottom in an annular combustor. As detonation waves propagate at a supersonic speed only in the bottom region of the RDEs, the combustor can be shortened. However, the combustor needs cooling system due to high heat flux to the combustor wall. In this experimental study, we performed combustion tests of RDE system using gaseous ethylene and oxygen as the propellant. This RDE system performance will also be demonstrated in space environment by the sounding rocket. We measured the combustor pressure, temperatures, heat flus, mass flow rate and thrust. The RDE system used in this study is shown in Figure 1. We performed the long-duration rotating detonation engine combustion tests for at sea level condition. The stable trust histories were obtained.
{"title":"Research and development of rotating detonation engine system for the sounding rocket flight experiment S520-31","authors":"J. Kasahara, A. Kawasaki, K. Matsuoka, A. Matsuo, I. Funaki, D. Nakata, M. Uchiumi","doi":"10.1063/1.5115842","DOIUrl":"https://doi.org/10.1063/1.5115842","url":null,"abstract":"A detonation is a combustion wave that propagates at supersonic speed (2∼3 km/s) in a combustible mixture. There are many fundamental studies of detonation waves and detonation engine systems. The detonation cycle has a higher thermal efficiency than a conventional constant-pressure combustion cycle. Therefore, it is expected that a high-efficiency propulsion system can be realized using detonation waves.A rotating detonation engine (RDE) uses continuous detonation propagating at a bottom in an annular combustor. As detonation waves propagate at a supersonic speed only in the bottom region of the RDEs, the combustor can be shortened. However, the combustor needs cooling system due to high heat flux to the combustor wall. In this experimental study, we performed combustion tests of RDE system using gaseous ethylene and oxygen as the propellant. This RDE system performance will also be demonstrated in space environment by the sounding rocket. We measured the combustor pressure, temperatures, heat flus, mass flow rate and thrust. The RDE system used in this study is shown in Figure 1. We performed the long-duration rotating detonation engine combustion tests for at sea level condition. The stable trust histories were obtained.","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"229 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":"116444762","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}
{"title":"Gasification characteristics of Bangladeshi Barapukurian coal in a high-temperature entrained flow gasifier under CO2 atmosphere","authors":"M. Shahabuddina, S. Bhattacharya","doi":"10.1063/1.5115884","DOIUrl":"https://doi.org/10.1063/1.5115884","url":null,"abstract":"","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"62 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":"133946709","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}
Imtiaz Taimoor, L. Rahman, Nazneen Sultana Aankhy, M. Khalid
Heat transfer enhancement has been a major concern in modern days in designing heat generating equipment. In the present study an experimental demonstration has been investigated to analyze the thermal performance of solid plate fin arrays and plate fin arrays with hexagonal perforations where the perforations are along the length of the fin, in the turbulent flow regime under steady state forced convection. The air velocity was varied ranging from 4ms−1 to 12ms−1 and data were recorded after a certain period of time at a constant heat flux. The performance of solid plate fin and plate fin with hexagonal perforation as heat sink was tested and best result was found in case of plate fin with hexagonal perforations. Convective heat transfer co-efficient, fin effectiveness, fin efficiency seem to increase in hexagonal perforation than solid ones. Thermal resistance seems to decrease in plate fin with hexagonal perforations than solid fins. This study suggests that most important parameter that govern the performance of fin is the fin geometry and varied cross section i.e. perforations.Heat transfer enhancement has been a major concern in modern days in designing heat generating equipment. In the present study an experimental demonstration has been investigated to analyze the thermal performance of solid plate fin arrays and plate fin arrays with hexagonal perforations where the perforations are along the length of the fin, in the turbulent flow regime under steady state forced convection. The air velocity was varied ranging from 4ms−1 to 12ms−1 and data were recorded after a certain period of time at a constant heat flux. The performance of solid plate fin and plate fin with hexagonal perforation as heat sink was tested and best result was found in case of plate fin with hexagonal perforations. Convective heat transfer co-efficient, fin effectiveness, fin efficiency seem to increase in hexagonal perforation than solid ones. Thermal resistance seems to decrease in plate fin with hexagonal perforations than solid fins. This study suggests that most important parameter that govern the per...
{"title":"Thermal performance analysis of plate fin arrays with hexagonal perforations under turbulent flow regime","authors":"Imtiaz Taimoor, L. Rahman, Nazneen Sultana Aankhy, M. Khalid","doi":"10.1063/1.5115847","DOIUrl":"https://doi.org/10.1063/1.5115847","url":null,"abstract":"Heat transfer enhancement has been a major concern in modern days in designing heat generating equipment. In the present study an experimental demonstration has been investigated to analyze the thermal performance of solid plate fin arrays and plate fin arrays with hexagonal perforations where the perforations are along the length of the fin, in the turbulent flow regime under steady state forced convection. The air velocity was varied ranging from 4ms−1 to 12ms−1 and data were recorded after a certain period of time at a constant heat flux. The performance of solid plate fin and plate fin with hexagonal perforation as heat sink was tested and best result was found in case of plate fin with hexagonal perforations. Convective heat transfer co-efficient, fin effectiveness, fin efficiency seem to increase in hexagonal perforation than solid ones. Thermal resistance seems to decrease in plate fin with hexagonal perforations than solid fins. This study suggests that most important parameter that govern the performance of fin is the fin geometry and varied cross section i.e. perforations.Heat transfer enhancement has been a major concern in modern days in designing heat generating equipment. In the present study an experimental demonstration has been investigated to analyze the thermal performance of solid plate fin arrays and plate fin arrays with hexagonal perforations where the perforations are along the length of the fin, in the turbulent flow regime under steady state forced convection. The air velocity was varied ranging from 4ms−1 to 12ms−1 and data were recorded after a certain period of time at a constant heat flux. The performance of solid plate fin and plate fin with hexagonal perforation as heat sink was tested and best result was found in case of plate fin with hexagonal perforations. Convective heat transfer co-efficient, fin effectiveness, fin efficiency seem to increase in hexagonal perforation than solid ones. Thermal resistance seems to decrease in plate fin with hexagonal perforations than solid fins. This study suggests that most important parameter that govern the per...","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"24 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":"127813770","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}
Numerical study of MHD mixed convection heat transfer in a lid-driven square cavity with single vertical fin attached to it’s hot wall has been carried out. Finite element method based Galerkin weighted residual technique is used to solve the governing equation. The effect of Richardson number, Hartmann number on the fluid flow and heat transfer characteristic inside the enclosure is investigated. A set of graphical results are presented in terms of streamlines, isotherms, temperature profiles, velocity profiles and fin effectiveness. The results indicate that the heat transfer rate increases with the increase of Richardson number and that, Hartmann number is a good control parameter for heat transfer in the flow having vertical fin in a lid-driven square cavity. The results are validated comparing with the published works.
{"title":"Numerical investigation of MHD mixed convection heat transfer having vertical fin in a lid-driven square cavity","authors":"M. Fayz-Al-Asad, M. Hossain, M. Sarker","doi":"10.1063/1.5115868","DOIUrl":"https://doi.org/10.1063/1.5115868","url":null,"abstract":"Numerical study of MHD mixed convection heat transfer in a lid-driven square cavity with single vertical fin attached to it’s hot wall has been carried out. Finite element method based Galerkin weighted residual technique is used to solve the governing equation. The effect of Richardson number, Hartmann number on the fluid flow and heat transfer characteristic inside the enclosure is investigated. A set of graphical results are presented in terms of streamlines, isotherms, temperature profiles, velocity profiles and fin effectiveness. The results indicate that the heat transfer rate increases with the increase of Richardson number and that, Hartmann number is a good control parameter for heat transfer in the flow having vertical fin in a lid-driven square cavity. The results are validated comparing with the published works.","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"55 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":"115552286","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}
Nasimul Eshan Chowdhury, Abdul Karim Miah, A. A. Bhuiyan
Cavitation is a common problem for marine propellers. Introducing water to the cavitation prone area to increase the operating pressure is one of the approaches to mitigate cavitation. The principle goal of this study is to investigate the effectiveness of this method, depending on the positions of the injection source. The k-ω SST turbulence model with the curvature correction and the Zwart cavitation model have been applied on the commercial CFD Code ANSYS to investigate the issue. This combined model has been validated against experimental data and a reasonable agreement has been observed. Finally, the final model has been computed on a modified INSEAN E779a propeller. The method has been found less effective for water, as a working fluid.Cavitation is a common problem for marine propellers. Introducing water to the cavitation prone area to increase the operating pressure is one of the approaches to mitigate cavitation. The principle goal of this study is to investigate the effectiveness of this method, depending on the positions of the injection source. The k-ω SST turbulence model with the curvature correction and the Zwart cavitation model have been applied on the commercial CFD Code ANSYS to investigate the issue. This combined model has been validated against experimental data and a reasonable agreement has been observed. Finally, the final model has been computed on a modified INSEAN E779a propeller. The method has been found less effective for water, as a working fluid.
{"title":"Numerical investigation on the effectiveness of water injection method for mitigating propeller cavitation","authors":"Nasimul Eshan Chowdhury, Abdul Karim Miah, A. A. Bhuiyan","doi":"10.1063/1.5115906","DOIUrl":"https://doi.org/10.1063/1.5115906","url":null,"abstract":"Cavitation is a common problem for marine propellers. Introducing water to the cavitation prone area to increase the operating pressure is one of the approaches to mitigate cavitation. The principle goal of this study is to investigate the effectiveness of this method, depending on the positions of the injection source. The k-ω SST turbulence model with the curvature correction and the Zwart cavitation model have been applied on the commercial CFD Code ANSYS to investigate the issue. This combined model has been validated against experimental data and a reasonable agreement has been observed. Finally, the final model has been computed on a modified INSEAN E779a propeller. The method has been found less effective for water, as a working fluid.Cavitation is a common problem for marine propellers. Introducing water to the cavitation prone area to increase the operating pressure is one of the approaches to mitigate cavitation. The principle goal of this study is to investigate the effectiveness of this method, depending on the positions of the injection source. The k-ω SST turbulence model with the curvature correction and the Zwart cavitation model have been applied on the commercial CFD Code ANSYS to investigate the issue. This combined model has been validated against experimental data and a reasonable agreement has been observed. Finally, the final model has been computed on a modified INSEAN E779a propeller. The method has been found less effective for water, as a working fluid.","PeriodicalId":423885,"journal":{"name":"8TH BSME INTERNATIONAL CONFERENCE ON THERMAL ENGINEERING","volume":"18 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":"124211479","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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