Abstract
The purpose of the present study is to examine the effects of geothermal viscosity on an unsteady flow of incompressible magnetic nanofluids (C1-20B & Taiho-W40) due to a heated rotating disk. The modeled system of nonlinear coupled partial differential equations governing the unsteady flow together with the two point variable boundary conditions have been transformed into the set of non-linear coupled ordinary differential equations. The resultant set of equations is then solved by fourth order Runge-Kutta method in MATLAB using ODE45 with shooting technique for initial guess. The influences of geothermal viscosity variations ( for temperature & for depth) along with the ferro-hydro-dynamic (FHD) interaction parameter and rotational parameter R on the flow and temperature field generated on the plate surface are elucidated. Besides the above profiles; effects of both, depth and temperature dependent viscosity parameters are also examined on the skin frictions, rate of heat transfer and boundary layer displacement thickness. The computed results for stronger (C1-20B) and weaker (Taiho-W40) convective magnetic nanofluids (MNF) have been discussed and compared vis-a-vis.
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