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Nor Ashikin Abu Bakar
Preferred name
Nor Ashikin Abu Bakar
Official Name
Nor Ashikin, Abu Bakar
Alternative Name
Bakar, N. A.A.
Bakar, Nor Ashikin Abu
Abu Bakar, N.
Main Affiliation
Scopus Author ID
56286797000
Researcher ID
AAM-1480-2021
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1 - 3 of 3
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PublicationDual solutions of boundary layer flow and heat transfer in hybrid nanofluid over a stretching/shrinking cylinderThe 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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PublicationSlip effect on unsteady hybrid nanofluid flow over a stretching/shrinking surfaceThe focus on this paper is to investigate the effect of slip in hybrid nanofluid past a stretching/shrinking surface by depending on time. The partial differential equations of governing equations are transformed to ordinary differential equations by employing appropriate similarity transformation. The equations are then solved numerically using bvp4c function in MATLAB software. The results of skin frictions coefficient and heat transfer rate are depicted in tables and graphs. It poses dual solutions for a certain domain of each solution.
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PublicationUnsteady stagnation-point flow and heat transfer over an exponential stretching/shrinking sheet in hybrid nanofluid exhibiting slip effectThis study focuses on the investigation of unsteady stagnation-point flow and heat transfer over an exponential stretching/shrinking sheet immersed in a hybrid nanofluid. Hybrid nanofluid is an engineered fluid and can enhance thermal conductivity and heat transfer efficiency and stagnation-point flow is important in designing heat exchangers. Hence, the heat exchange process such as in power generation, and refrigeration becomes more effective. This mathematical model applied the Tiwari and Das model where Al2O3 - Cu hybrid nanofluid is considered. The base fluid is water, and the shape of the nanoparticle is considered in sphere shape. The ordinary differential equations are solved using the bvp4c function in the Matlab program to obtain the skin friction coefficient, heat transfer rate as well as velocity and temperature profiles. This study provides some tables of the skin-fiction coefficients and heat transfer rate values for the validation with the previous study and new values for the future study. This study reveals that dual solutions exist for suction s > sc. The increase of copper nanoparticles expands the solution and increases the skin friction coefficient at the surface. Meanwhile, by considering the higher effect of the slip parameter, the findings show an increment in both skin friction coefficient and heat transfer rate at the surface. The heat transfer rate is seen increasing by considering the same value of nanoparticle Volume fraction for copper and alumina compared to the different values.