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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Scopus Author ID
55252803400
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AAS-2819-2020

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Nanofluid stagnation-point flow using Tiwari and Das model over a stretching/shrinking sheet with suction and slip effects

2020-01-01 , Yashkun, Ubaidullah , Wan Mohd Khairy Adly Wan Zaimi , Nor Ashikin Abu Bakar , Ferdows M.

In this paper, we considered the stagnation point flow and heat transfer of nanofluid over the stretching/shrinking surface by utilizing of Tiwari and Das nanofluid model. Additionally, the impact of suction and the first order slip likewise have been taken into the account. The system of governing partial differential equations (PDEs) is changed into the system of non-linear ordinary differential equations (ODEs) by means of similarity transformation. The resultant ODEs are solved by using BVP solver (bvp4c) in MATLAB software. The impact of some physical parameters, for example the suction parameter and the slip parameter on the skin friction coefficients and the local Nusselt number as well as the temperature and velocity profiles have been investigated, tabulated and graphically presented. These profiles and variations demonstrate that there exist dual solutions for a specific range of the stretching/shrinking parameter. Both suction and slip effects has enhance the local Nusselt number which represent heat transfer rate at the surface. It is also found that inclusion of both suction and slip effects expands the range of the dual solutions exist. The existence of the dual solutions only occurs in in the shrinking region. The flow separation in the boundary layer delay due to suction and slip effects imposed in the boundary condition.

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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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MHD Stagnation-point flow towards a permeable shrinking/stretching sheet in a porous medium with velocity slip and heat generation/absorption effects

2025 , Hisyam Juwaidi Aziz , Wan Mohd Khairy Adly Wan Zaimi , Fatinnabila Kamal , Adnan Asghar , Suliadi Firdaus Sufahani , Liaquat Ali Lund , Ubaidullah Yashkun , Mohammad Ferdows

The analysis of velocity slip and heat generation/absorption in fluid flow problems is crucial due to their significant impact on fluid behavior and heat transfer characteristics. The findings are vital for understanding and optimizing flow and heat transfer in industrial processes involving shrinking/stretching surfaces. Thus, this study aims to examine dual solutions of MHD stagnation-point flow over a stretching/shrinking sheet with suction/injection, velocity slip, and heat generation/absorption effects. The governing nonlinear partial differential equations are transformed into nonlinear ordinary differential equations using a similarity transformation and solved numerically using the boundary value problem solver bvp4c, a built-in MATLAB software. Dual solutions are found for the shrinking case, while the stretching case yields a unique solution. Increasing suction and slip parameters broadens the range of dual solutions. Results show that suction enhances the skin friction coefficient and heat transfer, whereas velocity slip reduces skin friction but increases heat transfer. Heat generation lowers the local Nusselt number. It is observed that the first solution is stable, while the second is unstable.

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Dissipative-radiative micropolar fluid transport in a non-darcy porous medium with cross-diffusion effects

2020-01-01 , Ferdows M. , Shamshuddin M.D. , Wan Mohd Khairy Adly Wan Zaimi

In this work, the micropolar fluid flow and heat and mass transfer past a horizontal stretching sheet through a porous medium are studied including the Soret-Dufour effect in the presence of viscous dissipation. A uniform magnetic field is applied transversely to the direction of the flow. The governing differential equations of the problem are transformed into a system of non-dimensional differential equations which are solved numerically by Nachtsheim-Swigert iteration technique along with the sixth order Runge-Kutta integration scheme. The velocity, microrotation, temperature and concentration profiles are presented for different parameters and interpreted at length. Results show that with an increase in vortex viscosity ratio parameter, suction parameter and radiation parameter, velocity is decreased whereas it increases with the increase of magnetic parameter, Darcy number and Eckert number. Angular velocity significantly elevated by increasing the suction parameter, surface nonlinearity parameter and magnetic parameter. Temperature gradient escalate with the increase of magnetic parameter and Dufour number, while a reverse trend is observed in case of increase of Darcy number, Eckert number and Soret number. Concentration gradient putrefies with Schmidt number and Dufour number. However, concentration grows with Soret number. The present problem finds significant applications in hydromagnetic control of conducting polymeric sheets and magnetic materials processing.

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