Entropy generation in MHD free convection of nanoliquid within a square open chamber with a solid body
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 14 July 2021
Issue publication date: 19 April 2022
Abstract
Purpose
The study aims to investigate magnetohydrodynamics thermal convection energy transference and entropy production in an open chamber saturated with ferrofluid having an isothermal solid block.
Design/methodology/approach
Analysis of thermal convection phenomenon was performed for an open chamber saturated with a nanofluid having an isothermal solid unit placed inside the cavity with various aspect ratios. The left border temperature is kept at Tc. An external cooled nanofluid of fixed temperature Tc penetrates into the domain from the right open border. The nanofluid circulation is Newtonian, incompressible, and laminar. The uniform magnetic field of strength B at the tilted angle of γ is applied. The finite volume technique is used to work out the non-linear equations of liquid motion and energy transport. For Rayleigh number (Ra=1e+7), numerical simulations were executed for varying the solid volume fractions of the nanofluid (ϕ = 0.01–0.04), the aspect ratios of a solid body (As = 0.25–4), the Hartmann number (Ha = 0–100), the magnetic influence inclination angle (γ = 0–π/2) and the non-dimensional temperature drop (Ω = 0.001–0.1) on the liquid motion, heat transference and entropy production.
Findings
Numerical outcomes are demonstrated by using isolines of temperature and stream function, profiles of mean Nusselt number and entropy generations. The results indicate that the entropy generation rate and mean Nu can be decreased with an increase in Ha. The inner solid block of As = 0.25 reflects the maximum heat transfer rate in comparison with other considered blocks. The addition of nano-sized particles results in a growth of energy transport and mean entropy generations.
Originality/value
An efficient computational technique has been developed to solve natural convection problem for an open chamber. The originality of this research is to scrutinize the convective transport and entropy production in an open domain with inner body. The outcomes would benefit scientists and engineers to become familiar with the investigation of convective energy transference and entropy generation in open chambers with inner bodies, and the way to predict the energy transference strength in the advanced engineering systems.
Keywords
Acknowledgements
This work of C. Sivaraj and E. Vignesh was carried out as a part of a research project (Grant No: INT/RUS/RFBR/P-282) awarded by the Department of Science and Technology, India and the work of M.A. Sheremet was conducted as a government task of the Ministry of Science and Higher Education of the Russian Federation (Project Number 0721–2020-0036).
Citation
Chinnasamy, S., E., V. and Sheremet, M. (2022), "Entropy generation in MHD free convection of nanoliquid within a square open chamber with a solid body", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 32 No. 5, pp. 1463-1487. https://doi.org/10.1108/HFF-03-2021-0172
Publisher
:Emerald Publishing Limited
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