Citation

Hossain, Md. Aslam and Islam, Md. Rafiqul and Alam, Md. Nur and Sagib, Md. and Sajib, M.A.H. and Podder, Chinmayee and Saha, Bijan Krishna and Hossen, Md. Jakir (2025) Impacts of nanoparticle shape and periodic heating on entropy generation inside a tilted nanofluid filled rectangular cavity. International Journal of Thermofluids, 30. p. 101424. ISSN 2666-2027

Text Impacts of nanoparticle shape and periodic heating on entropy generation inside a tilted nanofluid filled rectangular cavity.pdf - Published Version Restricted to Repository staff only Download (21MB)

Abstract

This paper deals with the utilization of TiO2-water nanofluid to investigate the MHD free convection (FC) flow and entropy generation inside a tilted rectangular cavity in the presence of uniform magnetic field. The bottom and the left vertical walls of the cavity are heated periodically, but the right vertical one is kept cool with a comparatively low temperature. The upper wall is a superb insulator. The walls are in no slip boundary con dition. The novelty of this work lies in the fact that, to date, no study has been addressed entropy generation optimization in cavities considering the both effects of inclination and periodic heating, as far as the author know. An analysis is conducted on the optimization of local entropy (LE) that results from the combination of HT and fluid movement throughout FC. The study of temperature distributions in terms of isothermal contours (IC), fluid flow patterns in terms of stream functions (SF) and HT rate in terms of Nu are presented in this investi gation. The simulation is carried out for 103 ≤ Ra ≤ 106 ,0 ≤ φ ≤ 0.04, 300 ≤ ω ≤ 900 ,0 ≤ Ha ≤ 80 and 0.2 ≤ AR ≤ 0.8. The continuity, momentum and energy equations are solved with the help of finite element Galerkin method after transforming them into non-dimensional form using some non-dimensional variables. The findings reveal that heat transfer and entropy generation in nanofluid-filled tilted cavities are strongly influenced by thermal, magnetic, particulate, and geometric parameters. High Ra and lamina-shaped nanoparticles enhance convection and heat transport, though at the expense of increased irreversibility, while moderateHa and low-tomoderate particle concentrations (φ ≈ 0.02) provide an optimal balance of efficiency. Geometric optimization, particularly an inclination angle of ω ≈ 60◦ and aspect ratio AR ≈ 0.4, minimizes entropy generation while maintaining effective circulation. These findings are significant as they establish optimal parameter ranges that enhance heat transfer while maintaining energy efficiency, providing practical design strategies for thermal management. Such insights are highly relevant to applications like electronic cooling, solar collectors, energy storage, and magneto-hydrodynamic systems, where balancing performance with reduced entropy generation is essential for reliable operation.

Item Type:	Article
Uncontrolled Keywords:	Magneto-hydrodynamics
Subjects:	Q Science > QC Physics > QC501-766 Electricity and magnetism > QC501-(721) Electricity > QC717.6-718.8 Plasma physics. Ionized gases
Divisions:	Faculty of Engineering and Technology (FET)
Depositing User:	Ms Rosnani Abd Wahab
Date Deposited:	30 Sep 2025 06:10
Last Modified:	05 Oct 2025 06:26
URII:	http://shdl.mmu.edu.my/id/eprint/14574

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