Eur. Phys. J. Spec. Top. (2021) 230: 1355-1370
https://doi.org/10.1140/epjs/s11734-021-00039-7

Regular Article

Unsteady MHD flow of a Williamson nanofluid on a permeable stretching surface with radiation and chemical reaction effects

¹ Department of Mathematics, SAS, VIT, 632014, Vellore, India
² Department of Mathematics, University of Central Florida, 32816-1364, Orlando, FL, USA

^b laxminarayana.pallava@gmail.com

Received: 27 October 2020
Accepted: 31 January 2021
Published online: 12 April 2021

Abstract

In the present work, we emphasize the impacts of an inclined magnetic field, viscous dissipation and radiation on the unsteady flow of a Williamson nanofluid over a vertical stretching porous surface with the presence of non-uniform heat source/sink and chemical reaction. In this study, we considered different kinds of nanoparticles such as silver, copper, aluminium oxide (${\text{Al}}_2{\text{O}}_3)$, titanium oxide (${\text{TiO}}_2)$, and magnesium oxide (MgO). The basic equations of this investigation are transmuted into a system of nonlinear and coupled ODEs using suitable similarity variables and elucidated numerically by R.-K. Fehlberg-based shooting technique. Influences of the pertinent parameters on the velocity, the temperature and the concentration distributions are deliberated with the assistance of graphs and tables. This study depicts that ${\text{Al}}_2{\text{O}}_3$ nanofluid has greater velocity since it has less dense nanoparticles compared to other nanoparticles. However, Cu-nanofluid has greater heat transfer due to greater thermal conductivity. Further, we identified that the thermal boundary layer thickness can be increased with the help of the viscous dissipation parameter. The inclination angle of the magnetic field strengthens the magnetic field on the fluid flow