Analysis of MHD Bioconvection Flow of a Hybrid Nanofluid Containing Motile Microorganisms over a Porous Stretching Sheet

This paper presents a numerical investigation of steady two-dimensional bioconvective MHD flow along with the heat and mass transfer phenomena of a water-based hybrid nanofluid containing motile microorganisms over a porous stretching sheet. The study considers effects of various physical parameters, such as thermal radiation, chemical reactions, Joule heating, and heat generation, on the flow and transport characteristics of the system. Copper (Cu) and alumina (Al2O3) nanoparticles are used with water (H2O) as the base fluid. The governing equations are transformed into a set of nonlinear ordinary differential equations using a standard similarity transformation. The reduced equations are solved numerically using the Keller-box method. The impact of different parameters on the velocity, temperature, concentration, and microorganism concentration profile is illustrated graphically, while their influence on the skin-friction coefficient, local Nusselt number, local Sherwood number, and local density number of motile microorganisms is tabulated. This study provides an excellent agreement with previously published works. The results of the study show that the presence of motile microorganisms significantly enhances the heat transfer rate and mixing efficiency of the nanofluid. The analysis demonstrates that the chemical reaction and thermal radiation play crucial roles in controlling the concentration and temperature distributions of the nanofluid, respectively.