Entropy generation in Williamson hybrid nanofluid with inclined magnetic field, non-uniform heat flux, thermal radiation and slip effects

Abstract

The present study provides the influence of entropy generation on steady two-dimensional laminar non-Newtonian Williamson hybrid nanofluid flow past a horizontal stretching sheet under the influence of the inclined magnetic field, radiation, non-uniform heat source/sink and slip effects. The governing partial differential equations are reduced to a system of ordinary differential equations using similarity transformations. The Runge–Kutta-4rth order method and the shooting technique are then adopted to solve the system. Two different kinds of fluids namely the engine oil based Molybdenum disulfide (MoS 2) nanofluid and Zinc Oxide (ZnO)-Molybdenum disulfide (MoS 2) engine oil hybrid nanofluids are considered to investigate the flow. The effect of important parameters on velocity, temperature, entropy generation and Bejan number are displayed in the form of figures and tables. Our results for some special cases are compared with previously published results to check the present study’s correctness and were found to be in good agreement. It is observed that the Williamson parameter increases the temperature but decreases the entropy generation whereas the angle of inclination of the magnetic field increases both the temperature and entropy generation. It is also observed entropy decreases with an increase in either velocity or thermal slips whereas it increases with radiation.