Pulsating magnetohydrodynamic flow of Fe₃O₄-blood based micropolar nanofluid between two vertical porous walls with Cattaneo–Christov heat flux and entropy generation

The present article is aimed to investigate the impact of entropy generation on pulsating hydromagnetic flow of a micropolar nanofluid between two vertical porous walls using the Cattaneo–Christov heat flux model. Here Fe₃O₄(magnetite) is taken as a nanoparticle and blood as micropolar fluid (base fluid). The significance of viscous dissipation, Ohmic heating, and thermal radiation are considered. This model is noteworthy in the field of magnetic bioseparation, pressure surges, magnetofection agent, biomedical engineering, cancer therapeutic, artificial kidney, brain tumors, and nano-drug delivery in the arteries. The governing partial differential equations are transformed into the system of ordinary differential equations by deploying the perturbation process and then solved numerically by employing the fourth-order Runge–Kutta scheme with the support of the shooting technique. The flow variables like velocity, microrotation, temperature, entropy generation, and Bejan number are depicted graphically and discussed in detail. The heat transfer rate is displayed through a table. The results depict that the velocity is diminishing with the enhancement of coupling parameter, Hartmann number, and nanoparticle volume fraction. The temperature of micropolar nanofluid is increasing with an increment of viscous dissipation, thermal radiation, and heat source while it is reducing with the enhancement of magnetic field, thermal relaxation time, and heat sink parameter. The entropy generation is diminished by increasing the values of Hartmann number, thermal relaxation, and coupling parameter. Further, the Bejan number is enhanced by varying thermal radiation and nanoparticle volume fraction.