Entropy optimization in cubic autocatalysis chemical reactive flow of Williamson fluid subjected to viscous dissipation and uniform magnetic field

Abstract

This research elaborates magnetohydrodynamics (MHD) impact on non-Newtonian (Williamson) fluid flow by stretchable rotating disks. Both disks are rotating with different angular velocities and different stretching rates. Viscous dissipation aspect is considered for energy expression formulation. Entropy generation analysis is described via implementation of thermodynamic second law. Chemical processes (heterogeneous and homogeneous) subjected to entropy generation are introduced first time in literature. Boundary-layer approach is employed for modeling. Apposite variables are introduced for non-dimensionalization of governing systems. Homotopy procedure yields convergence of solutions subjected to computations of highly nonlinear expressions. The significant characteristics of sundry factors against thermal, velocity and solutal fields are described graphically. Besides, tabular results are addressed for engineering quantities (skin-friction coefficient, Nusselt number). The outcomes certify an increment in temperature distribution for Weissenberg (We) and Eckert (Ec) numbers.

Keywords

entropy generation / viscous dissipation / Williamson fluid / uniform magnetic felid / quartic autocatalysis chemical reaction

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