Entropy generation in a second grade magnetohydrodynamic nanofluid flow over a convectively heated stretching sheet with nonlinear thermal radiation and viscous dissipation

• Published in: Results in physics Vol. 9; pp. 1077 - 1085
• Main Authors: Sithole, Hloniphile, Mondal, Hiranmoy, Sibanda, Precious
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2018; Elsevier
• Subjects: Convective boundary condition; Homogeneous-heterogeneous reaction; Nonlinear thermal radiation; Second grade fluid; Homogeneous-heterogeneous reaction; Nonlinear thermal radiation; Convective boundary condition; Second grade fluid
• ISSN: 2211-3797; 2211-3797
• DOI: 10.1016/j.rinp.2018.04.003

This study addresses entropy generation in magnetohydrodynamic flow of a second grade nanofluid over a convectively heated stretching sheet with nonlinear thermal radiation and viscous dissipation. The second grade fluid is assumed to be electrically conducting and is permeated by an applied non-uniform magnetic field. We further consider the impact on the fluid properties and the Nusselt number of homogeneous-heterogeneous reactions and a convective boundary condition. The mathematical equations are solved using the spectral local linearization method. Computations for skin-friction coefficient and local Nusselt number are carried out and displayed in a table. It is observed that the effects of the thermophoresis parameter is to increase the temperature distributions throughout the boundary layer. The entropy generation is enhanced by larger magnetic parameters and increasing Reynolds number. The aim of this manuscript is to pay more attention of entropy generation analysis with heat and fluid flow on second grade nanofluids to improve the system performance. Also the fluid velocity and temperature in the boundary layer region rise significantly for increasing the values of the second grade nanofluid parameter.