Analysis of entropy generation for Magnetohydrodynamics peristaltic motion of Carreau-Yasuda nanofluid through a curved channel with variable thermal conductivity and Joule heating

Abstract

Present communication investigates the effects of entropy generation on the MHD peristaltic motion of Carreau–Yasuda nanofluid through a curved geometry with temperature-dependent thermal conductivity. Considered non-Newtonian model depicts the thermophysical properties of graphene nano-powder and Ethylene glycol. The assumed flow situation is modeled considering viscous dissipation, heat absorption/generation, Joule heating, thermophoresis effects, Brownian motion, and slip conditions using lubrication approximation. Numerical computations of resulting non-linear system of equations subject to the related boundary conditions are carried out using NDSolve. Physical behaviors of velocity profile, Bejan number, temperature profile, concentration profile, stresses at the wall, entropy production, mass, and heat transfer rates are computed and presented through graphs and tables. The results indicate that temperature rises and concentration of nanofluids reduces for larger values of thermal slip parameter. In the curved channel, the velocity of fluids decreases by enhancing the Hartman number. Entropy generation is reduced by increasing thermal conductivity parameter. Temperature distribution increases when the Eckert number is assigned higher values. Furthermore, the Hartman number and curvature parameter are observed to enhance the rates of mass and heat transfer at the wall. Additionally, the straight channel results can be obtained for the higher values of the curvature parameter.