Entropy generation in chemically reactive pulsatile flow of Carreau-Yasuda nanofluid with Joule heating and thermal radiation: A Buongiorno model

Abstract

This work provides a thermodynamic analysis of entropy-optimized heat and mass transfer in a Carreau-Yasuda nanofluid flow through a channel, with blood considered as the base fluid. It takes into account various factors, such as Brownian movement, thermophoresis, chemical reaction, thermal radiation, and viscous dissipation, with a particular emphasis on magnetohydrodynamic pulsating flow. Non-dimensional analysis facilitated the derivation of nonlinear dimensionless partial differential equations (PDEs), which were systematically reduced to ordinary differential equations (ODEs) using perturbation theory. The ‘bvp4c’ algorithm in MATLAB is then harnessed to produce the findings for the group of ODEs. The findings presented herein support the hypothesis that as the power law index, Hartmann number, and Carreau-Yasuda constant get higher, the velocity shrinks. Amplifying the Brownian motion, Eckert number, and thermophoresis parameters results in temperature surge. The concentration diminishes as thermophoresis, Lewis number, and chemical reaction rise, and it intensifies with larger levels of Brownian motion. Moreover, the rate of heat transmission is enhanced through improvements in the thermophoresis parameter and Weissenberg number, whereas contrasting features are noticed for the mass transfer rate at the bottom wall. Higher values of the Eckert number and Brownian motion parameter significantly proliferate entropy generation, while also causing Bejan number to diminish.