Magnetohydrodynamics and Soret Effects on Bioconvection in a Porous Medium Saturated With a Nanofluid Containing Gyrotactic Microorganisms

Journal article

Authors / Editors

Shaw, Sachin

Research Areas

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Publication Details

Author list: Shaw S, Sibanda P, Sutradhar A, Murthy PVSN

Publisher: American Society of Mechanical Engineers (ASME)

Place: NEW YORK

Publication year: 2014

Journal: Journal of Heat Transfer (0022-1481)

Journal acronym: J HEAT TRANS-T ASME

Volume number: 136

Issue number: 5

Number of pages: 10

ISSN: 0022-1481

eISSN: 1528-8943

Languages: English-Great Britain (EN-GB)

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Abstract

We investigate the bioconvection of gyrotactic microorganism near the boundary layer region of an inclined semi infinite permeable plate embedded in a porous medium filled with a water-based nanofluid containing motile microorganisms. The model for the nano-fluid incorporates Brownian motion, thermophoresis, also Soret effect and magnetic field effect are considered in the study. The governing partial differential equations for momentum, heat, solute concentration, nanoparticle volume fraction, and microorganism conservation are reduced to a set of nonlinear ordinary differential equations using similarity transformations and solved numerically. The effects of the bioconvection parameters on the thermal, solutal, nanoparticle concentration, and the density of the microorganisms are analyzed. A comparative analysis of our results with previously reported results in the literature is given. Some interesting phenomena are observed for the local Nusselt and Sherwood number. It is shown that the Peclet number and the bioconvection Rayleigh number highly influence the local Nusselt and Sherwood numbers. For Peclet numbers less than 1, the local Nusselt and Sherwood number increase with the bioconvection Lewis number. However, both the heat and mass transfer rates decrease with bioconvection Lewis number for higher values of the Peclet number.

Keywords

Bioconvection, gyrotactic microorganism, Magnetic field, nanofluid, Porous medium, Soret effect

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