Pub Date : 2019-11-01DOI: 10.13189/ujme.2019.070614
Akram Louiz
In many industrial fields, there is an ever growing market demand for highly profitable engines. This fact encouraged to produce very developed engine parts, namely sophisticated injection systems. Consequently, the electronically enhanced injection systems are becoming very widespread for their high efficiency and cause the mechanical automatic systems to be neglected without enough studies. However, the electronically commanded injection is difficult to maintain because of the risks of short-circuits, and it is also difficult and expensive to repair since its captors are in high pressure and temperature areas. This paper aims to introduce a mathematical study of the basic direct injection operation by proving formulas representing forces, velocities and the energy involved in the injection mechanical mechanism without any electronic or computational complications. This theoretical mathematical modeling is useful for the efficiency experimental studies in order to improve the manufacturing and maintenance of all direct injection systems.
{"title":"Modeling of the Automatic Mechanical Injection System","authors":"Akram Louiz","doi":"10.13189/ujme.2019.070614","DOIUrl":"https://doi.org/10.13189/ujme.2019.070614","url":null,"abstract":"In many industrial fields, there is an ever growing market demand for highly profitable engines. This fact encouraged to produce very developed engine parts, namely sophisticated injection systems. Consequently, the electronically enhanced injection systems are becoming very widespread for their high efficiency and cause the mechanical automatic systems to be neglected without enough studies. However, the electronically commanded injection is difficult to maintain because of the risks of short-circuits, and it is also difficult and expensive to repair since its captors are in high pressure and temperature areas. This paper aims to introduce a mathematical study of the basic direct injection operation by proving formulas representing forces, velocities and the energy involved in the injection mechanical mechanism without any electronic or computational complications. This theoretical mathematical modeling is useful for the efficiency experimental studies in order to improve the manufacturing and maintenance of all direct injection systems.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121590243","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}
Pub Date : 2019-11-01DOI: 10.13189/ujme.2019.070608
Armand Augustin Fondjo, T. Dzogbewu
The stress raisers factor around circular holes in a plate exposed to uniform tensile load at the edges has been studied using Finite Element Analysis solvers. The effect of mesh quality on stress raisers factor, the maximum Von Mises stresses, the computing time, and the percentage error has been examined. 4 Node Quadrilateral Element and 8 Node Quadrilateral Element were utilized respectively as first-order component (4NQE) and higher-order component (8NQE) to assess the maximum Von Mises stress and the numerical stress raiser factor (Kn) at various mesh sizes. The maximum Von Mises stress and the stress raiser factor were determined using the following finite element solvers: ABAQUS, ANSYS, CATIA, STRAND 7, ALGOR, COSMOS/M, and FEMAP. The estimations of the numerical stress raiser factor (Kn) were compared with the theoretical stress raiser factor (Kt). There were discrepancies observed between the maximum Von Mises stresses of the FEA solvers.
{"title":"Assessment of Stress Raiser Factor Using Finite Element Solvers","authors":"Armand Augustin Fondjo, T. Dzogbewu","doi":"10.13189/ujme.2019.070608","DOIUrl":"https://doi.org/10.13189/ujme.2019.070608","url":null,"abstract":"The stress raisers factor around circular holes in a plate exposed to uniform tensile load at the edges has been studied using Finite Element Analysis solvers. The effect of mesh quality on stress raisers factor, the maximum Von Mises stresses, the computing time, and the percentage error has been examined. 4 Node Quadrilateral Element and 8 Node Quadrilateral Element were utilized respectively as first-order component (4NQE) and higher-order component (8NQE) to assess the maximum Von Mises stress and the numerical stress raiser factor (Kn) at various mesh sizes. The maximum Von Mises stress and the stress raiser factor were determined using the following finite element solvers: ABAQUS, ANSYS, CATIA, STRAND 7, ALGOR, COSMOS/M, and FEMAP. The estimations of the numerical stress raiser factor (Kn) were compared with the theoretical stress raiser factor (Kt). There were discrepancies observed between the maximum Von Mises stresses of the FEA solvers.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115043022","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}
Pub Date : 2019-11-01DOI: 10.13189/ujme.2019.070607
Taoufik Kriflou, M. Rachik, L. Azrar, Khalid El Bikri
The transverse spherical impact on an elastic-plastic beam is formulated and investigated herein. Both semi-analytical procedure and finite element (FEM) solution are elaborated. The semi analytical solution combines a finite difference method with the Hertz contact theory. The transient response of impact beams is computed by considering the loaded and unloaded phases. The contact force calculation is based on the model proposed by Stronge. To validate our semi-analytical model, a 3D finite element model has been developed. The comparison between the predictions from the presented semi-analytical and those from the 3D finite element models shows that the semi analytical model achieves very accurate predictions at a marginal computational time.
{"title":"Modeling and Simulation of Transient Impact Behavior of Elastic-Plastic Beam","authors":"Taoufik Kriflou, M. Rachik, L. Azrar, Khalid El Bikri","doi":"10.13189/ujme.2019.070607","DOIUrl":"https://doi.org/10.13189/ujme.2019.070607","url":null,"abstract":"The transverse spherical impact on an elastic-plastic beam is formulated and investigated herein. Both semi-analytical procedure and finite element (FEM) solution are elaborated. The semi analytical solution combines a finite difference method with the Hertz contact theory. The transient response of impact beams is computed by considering the loaded and unloaded phases. The contact force calculation is based on the model proposed by Stronge. To validate our semi-analytical model, a 3D finite element model has been developed. The comparison between the predictions from the presented semi-analytical and those from the 3D finite element models shows that the semi analytical model achieves very accurate predictions at a marginal computational time.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114210639","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}
Pub Date : 2019-11-01DOI: 10.13189/ujme.2019.070615
M. Lee, J. Y. Chan, J. Ling, Pui San Lee
This study aims to develop a water pump that utilizes natural hydro energy as driving force to deliver water to a higher ground. The conceptual design of using water wheel to extract kinetic energy from water flow and transfer the energy to power multiple piston pump was created based on the extensive literature review findings. The actual prototype is then built and modified to suit the actual environment considerations. Findings show that single pump is able to produce maximum pressure head of 7.14 meters and the maximum volume flowrate achieved is 19.2 l/hr (320ml/min). However, when multiple piston is connected in series (in this research three pistons is used), the maximum water head increased to 13.77 meters and the maximum volume flowrate about 19.2 l/hr. This result shows that the water pump can be used in remote area or places at higher ground that does not have constant water access. Performance of the whole system can be improved by several factors such as adding more blades to the water wheel, steeper angle and better piston shaft design for water pump, and also proper water sealing of the whole system to prevent head loss and increase the overall performance.
{"title":"Design and Development of Zero Electricity Water Pump for Rural Development","authors":"M. Lee, J. Y. Chan, J. Ling, Pui San Lee","doi":"10.13189/ujme.2019.070615","DOIUrl":"https://doi.org/10.13189/ujme.2019.070615","url":null,"abstract":"This study aims to develop a water pump that utilizes natural hydro energy as driving force to deliver water to a higher ground. The conceptual design of using water wheel to extract kinetic energy from water flow and transfer the energy to power multiple piston pump was created based on the extensive literature review findings. The actual prototype is then built and modified to suit the actual environment considerations. Findings show that single pump is able to produce maximum pressure head of 7.14 meters and the maximum volume flowrate achieved is 19.2 l/hr (320ml/min). However, when multiple piston is connected in series (in this research three pistons is used), the maximum water head increased to 13.77 meters and the maximum volume flowrate about 19.2 l/hr. This result shows that the water pump can be used in remote area or places at higher ground that does not have constant water access. Performance of the whole system can be improved by several factors such as adding more blades to the water wheel, steeper angle and better piston shaft design for water pump, and also proper water sealing of the whole system to prevent head loss and increase the overall performance.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131289470","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}
Pub Date : 2019-11-01DOI: 10.13189/ujme.2019.070601
W. Siswanto, Bayu Putra Martama
This study aims to identify the stress concentration and distribution pattern in the mid-cross-section of a concrete block in a four-point bending (FPB) test with notch and without notch using a finite element method (FEM). The research was preceded by a meshing sensitivity analysis (MSA) with verification of reference from FPB test deflection theories. The selected finite element model was then used for numerical FPB testing with load variants of 100 kN, 200 kN and 300 kN. Simulation test results show that the greatest stress and deflection of the model from the FPB simulation with notch occur in the mid-bottom area, while in the model without notch the strongest stress takes place in the mid-bottom area and the largest deflection in the mid-center area. The influence of load variation indicates that the greater the load, the greater the stress concentration and deflection around the notch. Simulation by FEM can replace real material tests by means of the finite element model applied in this study.
{"title":"Stress and Deflection of a Concrete Block in a Four-Point Bending (FPB) Test","authors":"W. Siswanto, Bayu Putra Martama","doi":"10.13189/ujme.2019.070601","DOIUrl":"https://doi.org/10.13189/ujme.2019.070601","url":null,"abstract":"This study aims to identify the stress concentration and distribution pattern in the mid-cross-section of a concrete block in a four-point bending (FPB) test with notch and without notch using a finite element method (FEM). The research was preceded by a meshing sensitivity analysis (MSA) with verification of reference from FPB test deflection theories. The selected finite element model was then used for numerical FPB testing with load variants of 100 kN, 200 kN and 300 kN. Simulation test results show that the greatest stress and deflection of the model from the FPB simulation with notch occur in the mid-bottom area, while in the model without notch the strongest stress takes place in the mid-bottom area and the largest deflection in the mid-center area. The influence of load variation indicates that the greater the load, the greater the stress concentration and deflection around the notch. Simulation by FEM can replace real material tests by means of the finite element model applied in this study.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130003995","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}
Pub Date : 2019-09-01DOI: 10.13189/ujme.2019.070501
Gurdeep Singh, K. Goyal, R. Goyal
The present work investigates the effect of hot corrosion on ASTM-SA213-T-22 Steel with different coatings of Al2O3-TiO2 at 900℃ in molten salt environment (40wt %Na2SO4+60wt%V2O5). The experimentation consisted of 50 cycles of heating coated and uncoated specimens for 1 hour at 900℃ in muffle furnace and cooling for 20 minutes at ambient temperature. The corroded specimens were analyzed using visual examination, weight change measurement, X-ray diffraction technique and Scanning electron microscopy/Energy-disperse X-ray analysis. The results showed that the uncoated substrate had been more affected with corrosion and gained more mass due to formation of iron oxide (Fe2O3) as compared to coated substrate because of better adhesion of Al2O3 coating with base metal SA213-T22 due to presence of TiO2. The presence of TiO2 increased the strength and durability of Al2O3 coating to withstand with high temperatures.
{"title":"Effect of TiO2 on Plasma Sprayed Al2O3 Based Composite Coatings at 900℃ in Molten Salt Environment","authors":"Gurdeep Singh, K. Goyal, R. Goyal","doi":"10.13189/ujme.2019.070501","DOIUrl":"https://doi.org/10.13189/ujme.2019.070501","url":null,"abstract":"The present work investigates the effect of hot corrosion on ASTM-SA213-T-22 Steel with different coatings of Al2O3-TiO2 at 900℃ in molten salt environment (40wt %Na2SO4+60wt%V2O5). The experimentation consisted of 50 cycles of heating coated and uncoated specimens for 1 hour at 900℃ in muffle furnace and cooling for 20 minutes at ambient temperature. The corroded specimens were analyzed using visual examination, weight change measurement, X-ray diffraction technique and Scanning electron microscopy/Energy-disperse X-ray analysis. The results showed that the uncoated substrate had been more affected with corrosion and gained more mass due to formation of iron oxide (Fe2O3) as compared to coated substrate because of better adhesion of Al2O3 coating with base metal SA213-T22 due to presence of TiO2. The presence of TiO2 increased the strength and durability of Al2O3 coating to withstand with high temperatures.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121344539","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}
Pub Date : 2019-09-01DOI: 10.13189/ujme.2019.070506
Mohamad Mustaqim Junoh, F. Ali, N. Arifin, N. Bachok
The steady stagnation-point flow of nanofluid over a stretching or shrinking sheet in its own plane is investigated. The governing nonlinear partial differential equations are transformed into a nonlinear ordinary differential equations via the similarity transformation before they are solved numerically using the bvp4c solver in the MATLAB. Three different types of nanoparticles (Cu; Al2O3; TiO2) in the water-based fluid are analyzed in this paper. Effects of the solid volume fraction ϕ on the fluid flow and heat transfer are evaluated. Numerical results are obtained for velocity and temperature distribution, as well as the skin friction coefficient and local Nusselt number are presented graphically. There exist dual solutions for a certain range of stretching/shrinking parameter ϵ. Therefore, a stability analysis is performed to determine which solution is linearly stable and physically realizable. From the stability analysis it is found that the first solution is stable whilst the second solution is not.
{"title":"Stability Analysis of Wang's Stretching/ Shrinking Sheet Problem for Nanofluids","authors":"Mohamad Mustaqim Junoh, F. Ali, N. Arifin, N. Bachok","doi":"10.13189/ujme.2019.070506","DOIUrl":"https://doi.org/10.13189/ujme.2019.070506","url":null,"abstract":"The steady stagnation-point flow of nanofluid over a stretching or shrinking sheet in its own plane is investigated. The governing nonlinear partial differential equations are transformed into a nonlinear ordinary differential equations via the similarity transformation before they are solved numerically using the bvp4c solver in the MATLAB. Three different types of nanoparticles (Cu; Al2O3; TiO2) in the water-based fluid are analyzed in this paper. Effects of the solid volume fraction ϕ on the fluid flow and heat transfer are evaluated. Numerical results are obtained for velocity and temperature distribution, as well as the skin friction coefficient and local Nusselt number are presented graphically. There exist dual solutions for a certain range of stretching/shrinking parameter ϵ. Therefore, a stability analysis is performed to determine which solution is linearly stable and physically realizable. From the stability analysis it is found that the first solution is stable whilst the second solution is not.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121313376","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}
Pub Date : 2019-09-01DOI: 10.13189/ujme.2019.070504
M. Kamal, N. A. Rawi, M. R. Ilias, Anati Ali, S. Shafie
The unsteady three dimensional boundary layer flow near a stagnation point region is studied numerically under the influence of microgravity environment. The boundary layer plate was embedded by the nanofluid with nanosized copper particles and water as a based fluid together with thermal radiation effect. The problem was mathematically formulated in term of coupled governing equations consisting of continuity, momentum and energy equations derived from the fundamental physical principles with Tiwari and Das nanofluid model. Boundary layer and Boussinesq approximation were then applied to the coupled equations and then reduced into non-dimensional equations to lessen the complexity of the problem using semi-similar transformation technique. Implicit finite different method known as Keller box method was used in this problem. The problem was then analyzed in terms of physical quantities of principal interest known as skin frictions and Nusselt number which explained the flow behavior and heat transfer analysis. From the outcome of the analysis, it was found that the parameter values for curvature ratio lead to the different cases of the stagnation point flow which is either plane stagnation flow or asymmetry stagnation flow. On the other hand, by increasing the nanoparticles volume fraction which is one of the nanofluid parameter may increase the skin frictions on both x- and y- directions. The presence of thermal radiation parameter was found to have increased the rate of change of heat transfer at the boundary layer flow.
{"title":"Effect of Thermal Radiation on a Three-dimensional Stagnation Point Region in Nanofluid under Microgravity Environment","authors":"M. Kamal, N. A. Rawi, M. R. Ilias, Anati Ali, S. Shafie","doi":"10.13189/ujme.2019.070504","DOIUrl":"https://doi.org/10.13189/ujme.2019.070504","url":null,"abstract":"The unsteady three dimensional boundary layer flow near a stagnation point region is studied numerically under the influence of microgravity environment. The boundary layer plate was embedded by the nanofluid with nanosized copper particles and water as a based fluid together with thermal radiation effect. The problem was mathematically formulated in term of coupled governing equations consisting of continuity, momentum and energy equations derived from the fundamental physical principles with Tiwari and Das nanofluid model. Boundary layer and Boussinesq approximation were then applied to the coupled equations and then reduced into non-dimensional equations to lessen the complexity of the problem using semi-similar transformation technique. Implicit finite different method known as Keller box method was used in this problem. The problem was then analyzed in terms of physical quantities of principal interest known as skin frictions and Nusselt number which explained the flow behavior and heat transfer analysis. From the outcome of the analysis, it was found that the parameter values for curvature ratio lead to the different cases of the stagnation point flow which is either plane stagnation flow or asymmetry stagnation flow. On the other hand, by increasing the nanoparticles volume fraction which is one of the nanofluid parameter may increase the skin frictions on both x- and y- directions. The presence of thermal radiation parameter was found to have increased the rate of change of heat transfer at the boundary layer flow.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126045388","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}
Pub Date : 2019-09-01DOI: 10.13189/UJME.2019.070502
A. Atak, A. Şık
Design affects the entire lifespan of a product. Humans design ideas in their environments, especially to meet their own needs. People come to design ideas and abilities from various objects and events in nature, and use these to increase their design capabilities. With the increase in human population, proliferation of product needs, and the dangerous use of products, the ethical risks have increased. The risks within unethical designs have now reached all levels of human life. Products have been introduced to the market without considering their ethics, and in many of them, only the material purpose has been pursued, instead of the benefit to humanity. This research focused on the goal of the product designers, which is to design and develop a product, while contributing to the awareness that the product needs to be subjected to both risk and ethical analyses as with all other requirements. The dominant task of this study is to enable designers and their designs to develop their own ethical discourse and concepts. In doing so, the most forward aim is to not damage humans, but to design what is useful. The impact on the designer is to have ethical responsibility for their designs.
{"title":"Designer's Ethical Responsibility and Ethical Design","authors":"A. Atak, A. Şık","doi":"10.13189/UJME.2019.070502","DOIUrl":"https://doi.org/10.13189/UJME.2019.070502","url":null,"abstract":"Design affects the entire lifespan of a product. Humans design ideas in their environments, especially to meet their own needs. People come to design ideas and abilities from various objects and events in nature, and use these to increase their design capabilities. With the increase in human population, proliferation of product needs, and the dangerous use of products, the ethical risks have increased. The risks within unethical designs have now reached all levels of human life. Products have been introduced to the market without considering their ethics, and in many of them, only the material purpose has been pursued, instead of the benefit to humanity. This research focused on the goal of the product designers, which is to design and develop a product, while contributing to the awareness that the product needs to be subjected to both risk and ethical analyses as with all other requirements. The dominant task of this study is to enable designers and their designs to develop their own ethical discourse and concepts. In doing so, the most forward aim is to not damage humans, but to design what is useful. The impact on the designer is to have ethical responsibility for their designs.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128606094","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}
Pub Date : 2019-09-01DOI: 10.13189/ujme.2019.070503
F. Zulkiflee, A. Q. Mohamad, M. R. Ilias, S. Shafie
This paper studied unsteady free convection flow between two parallel plates with mass diffusion. One of the plates is considered oscillating. Appropriate non-dimensional variables are used to reduce the dimensional governing equations along with imposed initial and boundary conditions. The exact solution to velocity, temperature and concentration profiles are obtained using the Laplace Transform technique. The graphical results of the solutions are presented to illustrate the behavior of the fluid flow with the influence of Schmidt number, Prandtl number, oscillating parameter, Grashof and mass Grashof number. The corresponding expressions for skin friction, Nusselt number and Sherwood number are also calculated. It is observed that increasing Prandtl and Schmidt numbers will increased the Nusselt number but decreased the skin friction.
{"title":"Oscillating Free Convection Flow between Two Parallel Plates with Mass Diffusion","authors":"F. Zulkiflee, A. Q. Mohamad, M. R. Ilias, S. Shafie","doi":"10.13189/ujme.2019.070503","DOIUrl":"https://doi.org/10.13189/ujme.2019.070503","url":null,"abstract":"This paper studied unsteady free convection flow between two parallel plates with mass diffusion. One of the plates is considered oscillating. Appropriate non-dimensional variables are used to reduce the dimensional governing equations along with imposed initial and boundary conditions. The exact solution to velocity, temperature and concentration profiles are obtained using the Laplace Transform technique. The graphical results of the solutions are presented to illustrate the behavior of the fluid flow with the influence of Schmidt number, Prandtl number, oscillating parameter, Grashof and mass Grashof number. The corresponding expressions for skin friction, Nusselt number and Sherwood number are also calculated. It is observed that increasing Prandtl and Schmidt numbers will increased the Nusselt number but decreased the skin friction.","PeriodicalId":275027,"journal":{"name":"Universal Journal of Mechanical Engineering","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126584489","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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