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Bioconvection in nanofluid-saturated porous square cavity containing oxytactic microorganisms

Chandra Shekar Balla (Department of Mathematics, Department of Mathematics, Vignana Bharathi Institute of Technology, Hyderabad, India)
C. Haritha (Department of Mathematics, Mahatama Gandhi Institute of Technology, Hyderabad, India)
Kishan Naikoti (Department of Mathematics, Osmania University, Hyderabad, India)
A.M. Rashad (Department of Mathematics, Prince Sattam bin Abdulaziz University, College of Science and Humanity Studies, Al-Kharj, Saudi Arabia and Department of Mathematics, Aswan University, Faculty of Science, Aswan, Egypt)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 27 November 2018

Issue publication date: 6 June 2019

250

Abstract

Purpose

The purpose of this paper is to investigate the bioconvection flow in a porous square cavity saturated with both oxytactic microorganism and nanofluids.

Design/methodology/approach

The impacts of the effective parameters such as Rayleigh number, bioconvection number, Peclet number and thermophoretic force, Brownan motion and Lewis number reduces the flow strength in the cavity on the flow strength, oxygen density distribution, motile isoconcentrations and heat transfer performance are investigated using a finite volume approach.

Findings

The results obtained showed that the average Nusselt number is increased with Peclet number, Lewis number, Brownian motion and thermophoretic force. Also, the average Sherwood number increased with Brownian motion and Peclet number and decreased with thermophoretic force. It is concluded that the flow strength is pronounced with Rayleigh number, bioconvection number, Peclet number and thermophoretic force. Brownan motion and Lewis number reduce the flow strength in the cavity.

Originality/value

There is no published study in the literature about sensitivity analysis of Brownian motion and thermophoresis force effects on the bioconvection heat transfer in a square cavity filled by both nanofluid and oxytactic microorganisms.

Keywords

Citation

Balla, C.S., Haritha, C., Naikoti, K. and Rashad, A.M. (2019), "Bioconvection in nanofluid-saturated porous square cavity containing oxytactic microorganisms", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 29 No. 4, pp. 1448-1465. https://doi.org/10.1108/HFF-05-2018-0238

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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