Study of MHD flow of hybrid nanofluid (Graphene-Al2O3/PAO oil) with variable viscosity and thermal conductivity

Résumé

The investigation explore about heat transfer of (Graphene-Al₂O₃/Poly-alpha-olefin oil) hybrid nanofluid with variable thermal conductivity and viscosity. The MHD hybrid nanofluid is considered into the unsteady radially stretching sheet. The present investigation explore the variation of external heat generation and internal friction on variable thermal conductivity(k_shnf(T)) and viscosity(µ_shnf(T)) of hybrid nanofluid. By utilizing suitable transformation the governing PDE’s transform into nonlinear ODE’s. To solve nonlinear ODE’s in MATLAB, we utilize the bvp4c numerically technique. The variation of different non dimensional parameter on velocity, temperature and heat transfer rate are discussed through graphs, Also nusselt number and skin friction factor are discussed to measured heat transfer rate and friction, as shown in table. The velocity and temperature profiles are degrade, raising into variable viscosity and reverse trend noticed in velocity and temperature, when we rise into thermal conductivity parameter. The temperature profile diminish, acceleration into unsteadiness parameter and prandtl number. Heat transfer rate increased with raising into variable thermal conductivity and viscosity. Heat transfer enhancement increased with raising into volume fractions of nanoparticles.
Keywords: Variable viscosity, Stretching sheet, Variable thermal conductivity, MHD flow, Graphene-Al₂O₃/Poly-alpha-olefin oil mixture, heat transfer.