Wan Mohd Khairy Adly Wan Zaimi
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Wan Mohd Khairy Adly Wan Zaimi
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Wan Mohd Khairy Adly, Wan Zaimi
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Wan Mohd Khairy Adly, Wan Zaimi
Zaimi, Wan Mohd Khairy Adly Wan
Zaimi, Khairy
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55252803400
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AAS-2819-2020

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Mhd mixed convection flow and heat transfer of a dual stratified micropolar fluid over a vertical stretching/ shrinking sheet with suction, chemical reaction and heat source

2020-01-01 , Khan A.A. , Wan Mohd Khairy Adly Wan Zaimi , Sufahani S.F. , Ferdows M.

The purpose of this study was to investigate the magnetohydrodynamic (MHD) mixed convection flow and heat transfer of a dual stratified micropolar fluid over a vertical permeable stretching/ shrinking sheet with chemical reaction and heat source. The governing nonlinear partial differential equations are reduced into a system of nonlinear ordinary differential equations using an appropriate similarity transformation. Then, the obtained ordinary differential equations are solved numerically using the boundary value problem solver (bvp4c) in MATLAB software. The numerical results are tabulated and plotted for the heat transfer characteristics, namely, the skin friction coefficient, the local Nusselt number, the local Sherwood number as well as the velocity, temperature and concentration profiles for some values of the governing parameters. The present numerical results also have been compared with the previous reported results for a particular case and the comparisons are found to be in an excellent agreement. The results indicate that the skin friction coefficient and the local Nusselt number increase with chemical reaction and heat source. The magnitude of the local Sherwood number increases with the increasing of chemical reaction parameter. However, the magnitude of the local Sherwood number decreases with heat source effect.

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Stagnation point flow of williamson nanofluid towards a permeable stretching/shrinking sheet with a partial slip

2020-01-01 , Khan A.A. , Wan Mohd Khairy Adly Wan Zaimi , Ying T.Y.

The Williamson stagnation nanofluid flow over a stretching/shrinking surface with active and passive control are numerically studied. The main focus of the present study is to investigate the impacts of partial slip and suction at the boundary on the velocity, temperature, and nanoparticle volume fraction profiles and heat transfer characteristics. It is crucial to analyze the fluid flow and heat transfer problems with the inclusion of partial slip and suction effects due to an extensive variety of applications in the industry. The governing partial differential equations are reduced to a set of coupled nonlinear ordinary differential equation systems using nondimensional variables and then it is solved using the boundary value problem solver (bvp4c) in MATLAB. Results show that both velocity and nanoparticle volume fraction increase as the suction parameter increases while the temperature acts in the opposite manner. The magnitude of the reduced skin friction coefficient, the reduced Nusselt number and the reduced Sherwood number are notably increased for the first solution with the increasing suction parameter. It is seen that the nanofluid velocity increases as the partial slip parameter increases whereas the temperature and nanoparticle volume fraction of the nanofluid are decreased. As partial slip parameter enhanced, the reduced skin friction coefficient has decreased while the magnitude of both the local Nusselt number and the local Sherwood number are increasing. Dual solutions exist up to a certain range of the stretching/shrinking parameter in the shrinking flow region. The critical values of stretching/shrinking parameter increases with the increasing in suction and partial slip effect strength suggest that both parameter widens the range of dual solutions exist. Physically, the increment of the suction and slip effects has delayed the boundary layer separation. The first solution is found to be stable and physically applicable but the second solution is not based on the literature for the similar problem presented by researchers.

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Unsteady mhd stagnation point flow of al2o3-cu/h2o hybrid nanofluid past a convectively heated permeable stretching/shrinking sheet with suction/injection

2022-01-01 , Khan A.A. , Wan Mohd Khairy Adly Wan Zaimi , Ying T.Y.

The numerical investigation of unsteady magnetohydrodynamic (MHD) stagnation point flow of Al2O3-Cu/H2O hybrid nanofluid past a convectively heated permeable stretching/shrinking sheet with suction/injection effect is underlined. The characteristic of MHD and boundary condition with suction/injection has received a lot of consideration due to its across-the-board application in mechanical and chemical engineering. The governing continuity, momentum and energy equations are transformed into a system of nonlinear ordinary differential equations using similarity transformation, which is then solved using the bvp4c routine. Numerical results are obtained for the skin friction coefficient, local Nusselt number as well as the velocity and temperature profiles for certain values of the governing parameters, namely suction/injection parameter, copper nanoparticle volume fraction parameter and MHD parameter. Results showed that both velocity profile and temperature increase as the suction/injection parameter γ increases for the first solution and decreases for the second solution. Similarly, when increase the value of MHD parameter M, the velocity and temperature profiles are decreases for both solutions. The magnitude of the reduced skin friction coefficient and the local Nusselt number are notably increased for the first solution with increasing values of the suction/injection and MHD parameters. Finding also revealed that the skin friction coefficient is intensified in conjunction with the local Nussel number by adding up the copper nanoparticle volume fraction. In general, dual solutions are found to exist to a particular extent of the stretching/shrinking sheet.

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MHD Flow and Heat Transfer of Double Stratified Micropolar Fluid over a Vertical Permeable Shrinking/Stretching Sheet with Chemical Reaction and Heat Source

2020-12-01 , Khan A.A. , Wan Mohd Khairy Adly Wan Zaimi , Sufahani S.F. , Ferdows M.

The present study analyses the magnetohydrodynamic (MHD) flow of a double stratified micropolar fluid across a vertical stretching/shrinking sheet in the presence of suction, chemical reaction, and heat source effects. The governing equations in the form of partial differential equations are transitioned into coupled nonlinear ordinary differential equations by means of similarity transformation. The numerical solutions are obtained with the aid of the boundary value problem bvp4c solver in the MATLAB software. Numerical results have been confirmed with the previous results for a certain case and the comparison is found to be in an excellent agreement. Results for related profiles and heat transfer characteristics are displayed through plots and tabulated for the governing parameters involved. It is found that the reduced skin friction coefficient and the local Nusselt number increase with the increasing chemical reaction and heat source parameters. The rising values of the chemical reaction parameter have increased the magnitude of the local Sherwood number. In contrary, the heat source parameter has the tendency to decrease the magnitude of the local Sherwood number.

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Stagnation Point Flow of MHD Nanofluid towards a Permeable Stretching/Shrinking Sheet with a Partial Slip and Heat Source Effects

2022-06-24 , Khan A.A. , Wan Mohd Khairy Adly Wan Zaimi , Ying T.Y.

The flow of MHD nanofluid towards a permeable stretching/shrinking sheet with chemical reaction, partial slip and heat source effects at the stagnation point has been examined. The state of this partial slip boundary condition and heat source in flow configuration has devoted a considerable attention on account of its widespread application in industrial and chemical engineering. Slip velocity is included to the boundary condition as a part of entrenched stretching/shrinking velocity. The leading partial differential equations are reduced to a set of ordinary differential equation systems with the help of similarity transformations and then it has been clarified utilizing the boundary value problem solver (bvp4c) package in MATLAB. The skin friction coefficient, local Nusselt number, and local Sherwood number, as well as velocity, temperature, and nanoparticle volume fraction profiles for certain values of the leading parameters, namely partial slip parameter and heat source parameter, are calculated numerically in the study. Results indicates that nanoparticle and temperature volume fraction rise as the heat source variable enhances while the velocity remain constant. The size of the skin friction coefficient, Nusselt number, and Sherwood number are all significantly lowered in the first solution when heat source and slip factors rise. For a given range of the stretching/shrinking variable, it is determined that there are two different solutions persist.

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