Effect of magnetic field on mixed convection flow of Oldroyd-B nanofluid induced by two infinite isothermal stretching disks

Abstract

This paper is concerned with the study of magnetohydrodynamic mixed convection, axi-symmetric flow of Oldroyd-B nanofluid between two infinite isothermal stretching disks. The Brownian motion and thermophoresis diffusion effects are investigated. An exothermal surface reaction is modeled by Arrhenius kinetics, which supplied heat to the Oldroyd-B fluid. Firstly, the flow analysis is modeled and then computed analytically using HAM for the series solution of velocity, temperature and nanoparticle concentration profiles. Graphs are prepared for parametric study to observe the effects of Archimedes number, thermophoresis parameter, activation energy parameter and Brownian motion parameter. The values of Nusselt numbers and Sherwood number are analyzed through tabulated values for both lower and upper disks. It is observed that buoyancy parameter and Brownian motion parameter have significant impact on fluid temperature and nanoparticle concentration. Results also showed that the temperature and nanoparticle concentration are enhanced due to thermophoresis diffusion parameter.