Second law analysis of MHD Carreau fluid flow through a microchannel with thermal radiation

The present work projects on constructing a Carreau fluid to investigate the entropy rate for a magnetohydrodynamic (MHD) steady fluid flow in a micro-channel. The second law of thermodynamics and rheological expressions of Carreau fluid are considered. This theoretical study is relevant to a microchannel heat sink, a microchannel heat exchanger, a microwave amplifier manufacturing process, medicine, renewable energies, polymer extrusion, nuclear reactors, fiber production refrigeration, and electrical cooling. The numerical simulations were computed with the Finite element method. The graphical illustrations were constructed to examine the effect of various physical quantities for entropy, Bejan number, velocity, and temperature conditions. Simulated results show that entropy and Bejan number (Be) have the escalating behavior of the magnetic parameter.