THERMAL INVESTIGATION OF ELECTROOSMOTIC-PERISTALTIC PUMPING IN A POROUS MICROCHANNEL WITH A TAPERED CROSS SECTION

This study investigates the electrohydrodynamic transport and thermal transfer of intrauterine fluid within a tapered porous microfluidic channel affected by axial electric and transverse magnetic fields. The aim is to examine the synergistic impacts of electroosmosis, fluid, and thermal transfer within physiological flow systems. A two-dimensional unsteady mathematical model is formulated utilizing the Nernst-Planck, Poisson, and momentum equations, integrated with energy conservation under the Debye-Huckel approximation. The Sisko fluid model is utilized to describe non-Newtonian fluid behavior. The numerical solutions of the governing equations are corroborated with prior research. The results underscore significant findings: axial velocity diminishes toward the centerline while exhibiting contrasting behavior near the channel borders. Increased Hartmann numbers diminish velocity, entrapment, and peristaltic pumping. The electroosmotic parameter, medium mobility, and porous permeability substantially affect wall shear stress and trapping. Temperature rises with the Hartmann number, electroosmotic parameter, zeta potential, and Brinkman number and is elevated for shear thickening fluids in comparison to shear thinning or Newtonian fluids. This work emphasizes the significance of zeta potential in fluid management and underscores the critical role of external fields and fluid characteristics in governing flow and heat transmission. Applications encompass biomicrofluidics, including zygote implantation and medication delivery systems.