Enhanced Bioconvection Adjacent to Permeable Cylinder in Hybrid Nanofluids: Bacteria Distribution and Physical Features under Magnetic Field Influence

• Published in: Journal of engineering physics and thermophysics Vol. 98; no. 2; pp. 454 - 467
• Main Authors: Mabrouk, Samah M., Nasr, Ehsan H., Kabeel, Abd Elnaby, Rashed, Ahmed S.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.03.2025; Springer Nature B.V
• Subjects: Bacteria; Classical Mechanics; Complex Systems; Differential equations; Diffusion coefficient; Engineering; Engineering Thermodynamics; Heat and Mass Transfer; Inclination angle; Industrial Chemistry/Chemical Engineering; Magnetic fields; Magnetic properties; Microorganisms; Nanofluids; Nanoparticles; Ordinary differential equations; Parameter modification; Prandtl number; Pseudomonas fluorescens; Shape factor; Thermodynamics; Thermophoresis; Brownian motion coefficient; hybrid fluid; bioconvection
• ISSN: 1062-0125; 1573-871X
• DOI: 10.1007/s10891-025-03119-w

The presence of motile bacteria within hybrid nanofluids induces the phenomenon of bioconvection. The hybrid nanofluid was subjected to the presence and distribution analysis of Bacillus cereus, Bacillus brevis, Salmonella typhimurium, and Pseudomonas fluorescens. This study explains the theoretical analysis of a hybrid fluid with nanoparticles and gyrotactic microorganisms subjected to induced magnetic field in three dimensions. Using the group technique, the governing system of equations has been simplified to a set of ordinary differential equations (ODEs). The present study was motivated by an investigation into the effects of several parameters. The Prandtl number Pr, magnetic parameter M, inclination angle γ, shape factor n, permeability coefficient k p , diffusion coefficient of microorganism D n , Brownian motion coefficient D B , thermophoresis diffusion coefficient D T , and concentration difference δ c are examples of such parameters. For different flow regulating parameters, the modification of physical quantities, such as temperature, velocity, nanoparticle characteristics, and the density of motile microorganisms, is observed with precise physical features.