Boundary layer and entropy analysis of non-Newtonian Casson nanofluids moving nonlinearly in a wedge-shaped stretching plate under an unsteady flow

In this paper, the boundary layer and entropy production characteristics of a Casson nanofluid moving nonlinearly in a wedge-shaped stretching plate under an unsteady flow are investigated. In the course of the study, the continuity, momentum, energy and concentration equations are changed into nonlinear ordinary differential equations by similarity transformation, and numerical solution methods are used to obtain the effects of several dimensionless parameters on velocity, temperature, concentration and entropy production. The results show that changes in the magnetic field, buoyancy and Casson parameters lead to changes in the fluid viscosity, which in turn affects the thermal mass-transfer properties of the fluid. It is also found that the Brinkman number is proportional to the entropy production and inversely proportional to the Bejan number. The results of Casson nanofluid heat and mass transfer and entropy production can provide important theoretical support for applications in the field of Casson fluid engineering.