Numerical analysis of MHD thermal-free bio-convection of nanofluid inside an Γ-shaped enclosure loaded with gyrotactic microorganisms

• Published in: International journal of modern physics. B, Condensed matter physics, statistical physics, applied physics Vol. 37; no. 22
• Main Author: Fereidooni, Jalil
• Format: Journal Article
• Language: English
• Published: Singapore World Scientific Publishing Company 10.09.2023; World Scientific Publishing Co. Pte., Ltd
• Subjects: Convective heat transfer; Enclosures; Finite element method; Free convection; Mathematical analysis; Microorganisms; Nanofluids; Numerical analysis; Oceans; Peclet number; Rayleigh number; Gyrotactic microorganisms; MHD; shaped cavity; bio-convection; nanofluid; FEM
• ISSN: 0217-9792; 1793-6578
• DOI: 10.1142/S0217979223502181

Gyrotactic microorganisms may be mobile ones that exist in surroundings, for instance oceans, pools, and reservoirs. The convective heat transfer due to the movement of these microorganisms in the base fluids is known as bio-convection. In this paper, the analysis of MHD bio-convection of nanofluid in the Γ -shaped enclosure with gyrotactic microorganisms inside is conducted. The effect of thermal Rayleigh number Rat (104–105), bio-convection Rayleigh number (10–100), Lewis number (0.1–0.9), and Peclet number (10 − 3 –10 − 1 ) on the natural convection (NC) and concentration of the micro-organisms (C) is investigated. The Navier–Stokes equations are used as the governing equations and are solved by Finite Element Method. The results reveal that Le may have a reverse impact on Nuavg (upto 42%); however, Pe has a positive impact on both Nuavg (upto 10%) and Shavg (upto 12%) and enhances heat transfer performance.