Dynamics of bioconvection-driven fluid flow through Riga plates in presence of triple stratifications and multiphase slip effects

Abstract

This study explores the dynamics of an unsteady 2D bioconvection-driven fluid flow confined between Riga plates focusing on microfluidics. The proposed model incorporates the synergistic effects of gyrotactic microorganisms, thermal and solutal stratification, and activation energy under multiphase slip boundary conditions. By employing similarity alterations, the governing equations are converted into a system of dimensionless ordinary differential equations. To tackle the amenable numerical outcomes the bvp4c package within MATLAB is applied. This study explores fluid flow features through a squeezed Riga plate channel emphasizing the influence of microorganisms and concentration dynamics. It innovatively integrates triple stratifications in heat, solutal, and microorganism density transfer mechanisms. The investigation details how various parameters, including the bioconvection Lewis number, stratification factors, and activation energy influence the projected fluid model. The results are presented graphically emphasizing their physical significance. Combined effects of thermal stratification and radiation significantly enhance heat transfer within the fluid. Motile microorganism slips and a higher Peclet parameter decrease local microorganism concentration. Porosity reduces velocity at low values but increases it at high values while promoting heat dissipation and microorganism growth.