Rohana Abdul Hamid
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Preferred name
Rohana Abdul Hamid
Official Name
Rohana, Abdul Hamid
Alternative Name
Hamid, Rohana Abdul
Abdul Hamid, Rohana
Hamid, R. A.
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Scopus Author ID
36975763800

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Dual solutions of boundary layer flow and heat transfer in hybrid nanofluid over a stretching/shrinking cylinder

2023 , Nor Ashikin Abu Bakar , Rohana Abdul Hamid , Najwa Najib

The boundary layer flow over a stretching/shrinking cylinder in hybrid nanofluid with the effects of suction, partial slip and convective boundary condition is studied. Hybrid nanoparticles Al2O3 and TiO2 with water as based fluid are considered in the study. The partial differential equations are transformed to ordinary differential equations by employing the similarity variables. The numerical results are obtained using the bvp4c solver in MATLAB software. The influence of nanoparticles volume fraction (Al2O3-TiO2 in water-based fluid), curvature parameter, suction parameter, partial slip parameter and Biot number on the velocity profile, temperature profile, skin friction coefficient and heat transfer rate are discussed. The numerical results indicate that for shrinking surface case, the dual solutions exist for a certain range of curvature parameter and suction parameter.

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Marangoni convection boundary layer flow of ferrofluid with the effects of thermal radiation and suction

2020-12 , Mimi Arina Hafizah Mohd Khairon , Rohana Abdul Hamid

The problem of thermal Marangoni convection boundary layer flow in ferrofluid with the presence of radiation and suction is evaluated in this paper. This study considered magnetite ferroparticle (Fe3O4) in two different base fluids, which are water and kerosene. The method of the solution involves similarity transformation, which reduces the governing partial differential equations to a system of an ordinary differential equation. Then, the equations are solved utilizing built-in bvp4c function in MATLAB software. The impacts of the suction parameter and thermal radiation parameter concerning the velocity profiles, temperature profiles, surface velocity and heat transfer are illustrated in graphs and tables. It is revealed that the suction parameter reduces the velocity profiles, temperature profiles and surface velocity. However, the heat transfer increases with the suction parameter; meanwhile, the thermal radiation parameter increases the temperature profiles. However, it reduces heat transfer. The same trends are observed in both water and kerosene ferrofluid. Nevertheless, higher heat transfer is observed in kerosene-based ferrofluid

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Boundary layer flow of dusty Ferrofluid : a comparative analysis of stagnation flow influence

2024-11 , Siti Hajar Abdullah , Rohana Abdul Hamid , Roslinda Nazar

This research examines the characteristics of the boundary layer in the occurrence of dust particles within the ferrofluid boundary layer, aiming to understand the impact of stagnation flow or without stagnation flow in such systems. For this purpose, ferroparticles, namely magnetite (Fe3O4), are taken into consideration with kerosene and water as base fluids. The governing partial differential equations of the problem under consideration are converted into ordinary differential equations (ODEs) through the utilization of similarity transformations. Here, the equations obtained are then numerically solved utilizing MATLAB's built-in bvp4c solver. Moreover, the parameters’ effects, namely the dust particle loading, volume fraction of ferroparticles, and Eckert number to the flow with and without stagnation flow are computed and shown through tables and graphs. The findings indicate that the skin friction coefficient values for the stagnation-point flow are higher than those without stagnation-point flow. The Eckert number increases temperature profiles for both flows but more prominent in the flow without stagnation-point.

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