Effect of Hall current on the flow and heat transfer of non-Newtonian power-law nanofluid in the presence of Cattaneo–Christov heat flux and free stream

Mohamed Abd El-Aziz () and Abdelraheem M. Aly
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Mohamed Abd El-Aziz: Department of Mathematics, Faculty of Science, Helwan University, Helwan, Cairo 11795, Egypt
Abdelraheem M. Aly: ��Department of Mathematics, College of Science, King Khalid University, Abha 61411, Saudi Arabia‡Department of Mathematics, Faculty of Science, South Valley University, Qena 83523, Egypt

International Journal of Modern Physics C (IJMPC), 2021, vol. 32, issue 11, 1-28

Abstract: The nanofluids are a recent challenging task in a nanotechnology field used in heat transfer enhancement for base fluids. The major purpose of this research is to examine the influences of Hall current on the non-Newtonian power-law nanofluid on an exponentially extending surface. Implementation in the Cattaneo–Christov heat flux and the free stream is performed to analyze the thermal relaxation features. Entropy generation evaluation and Bejan number during the convection flow are investigated. The Runge–Kutta–Fehlberg method is employed to resolve the transformed governing nonlinear equations. The impacts of the key physical factors on the profiles of primary and secondary velocities, temperature and entropy generation are discussed across the graphs. The local skin-friction coefficients, Nusselt and Sherwood numbers are demonstrated in a tabular form under the impacts of key physical parameters. Two different types of power-law indicators including pseudoplastic fluid (n=0.7) and dilatant fluid (n=1.2) are conducted. The results indicated that the flow speed decreases at dilatant fluid compared to pseudoplastic fluid due to higher viscosity. Increasing Hall current parameter powers the axial and secondary velocity profiles. Thermophoresis parameter powers the profiles of the temperature, nanoparticle volume fraction and local entropy generation. The dilatant fluid (n=1.2) gives higher values of Cfx,Cfz,Nux and Shx compared to the pseudoplastic fluid (n=0.7).

Keywords: Boundary layer; Hall current; free stream; magnetohydrodynamic; nanofluid; power-law (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0129183121501485

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