Cu–Al2O3/engine oil Williamson hybrid nanofluid flow over a stretching/shrinking Riga plate with viscous dissipation and radiation effect

Abstract

AbstractThe current effort aims to analyze fluid flow characteristics in engine oil Williamson hybrid nanofluid flow past a Riga‐plate. The employed model is influenced by thermal radiation effect, viscous dissipation, and convective surface boundary conditions. The composed equations are distorted into dimensionless form by an appropriate similarity technique. Dual solutions (a stable and an unstable solution) to the resultant highly nonlinear coupled system are found using the shooting approach. In the restricted situation, the results attained agree with published work. The impact of the necessary controlling parameters on velocity profile, temperature profile, skin friction coefficient, and reduced Nusselt number are illustrated graphically. Numerically calculated values of skin friction coefficients in both and directions and reduced Nusselt numbers are also presented in the tabular form. The notable finding of the problem analyzed is that a sufficient amount of suction is necessary for the shrinking flow to be possible. Biot number, Eckert number, and radiation parameter do not affect boundary layer separation whereas an upsurge in width of electrodes and magnets decreases the range of the first and the second solutions, and modified Hartmann number increases it.