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Effects of Gold Nanoparticles Shapes on Magnetohydrodynamic Flow and Heat Transfer in the Presence of Thermal Radiation

Journal of Magnetics, Volume 25, Number 3, 30 Sep 2020, Pages 319-329
Umair Rashid (CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China), Azhar Iqbal (Mathematics and Natural Sciences, Prince Mohammad Bin Fahd University), Haiyi Liang * (IAT-Chungu Joint Laboratory for Additive Manufacturing), Jamshid ul Rahman (School of Mathematical Science, University of Science and Technology of China)
Abstract
The objective of present study is to examine the effects of nanoparticles shapes on magnetohydrodynamic
(MHD) boundary layer flow and heat transfer of nanofluid over a flat plate in the presences of thermal radiation.
Three categories of fluids such as pure water, ethylene glycol and engine oil with Prandtl number (Pr) =
7.8 containing three different shapes of Gold (Au) nanoparticles i.e. sphere, platelet and lamina have used in
this study. By using unique similarity transformation, the governing partial differential equations (PDEs) are
converted into a system of non-linear ordinary differential equations (ODEs) which have tackled numerically
by bvp4c program. The behaviours of several pertinent parameters i.e. solid volume fraction (φ), magnetic field
(M) and thermal radiation (Rd) for different shapes of nanoparticles also elucidated in detail. The results indicated
that all selected parameters have a significant impact on the thermal boundary layer. The Nusselt number
is presented in graphically form. The nanoparticles of sphere shape in Au-Ethylene glycol are more
significant for temperature disturbance. The heat transfer rate has found greater for lamina shapes in Au-
Engine oil
Keywords: numerical solution; nanoparticles; flat plate; thermal radiation; nanofluids; MHD boundary layer flow
DOI: https://doi.org/10.4283/JMAG.2020.25.3.319
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