Impact of five obstacles with constant temperatures on the mixed convection flow of water/copper nanofluid in a rectangular cavity with a magnetic field

Jawed Mustafa; Saeed Alqaed; Shahid Husain; Mohsen Sharifpur

Results in Physics (Feb 2024)

Impact of five obstacles with constant temperatures on the mixed convection flow of water/copper nanofluid in a rectangular cavity with a magnetic field

Jawed Mustafa,
Saeed Alqaed,
Shahid Husain,
Mohsen Sharifpur

Affiliations

Jawed Mustafa: Mechanical Engineering Department, College of Engineering, Najran University, P.O. Box (1988), Najran 61441, Saudi Arabia; Corresponding authors at: Mechanical Engineering Department, College of Engineering, Najran University, Najran, Saudi Arabia (J. Mustafa) and Department of Mechanical and Aeronautical Engineering, University of Pretoria, South Africa (M. Sharifpur).
Saeed Alqaed: Mechanical Engineering Department, College of Engineering, Najran University, P.O. Box (1988), Najran 61441, Saudi Arabia
Shahid Husain: Department of Mechanical Engineering, Zakir Husain College of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, India
Mohsen Sharifpur: Department of Mechanical and Aeronautical Engineering, University of Pretoria, South Africa; Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan; Corresponding authors at: Mechanical Engineering Department, College of Engineering, Najran University, Najran, Saudi Arabia (J. Mustafa) and Department of Mechanical and Aeronautical Engineering, University of Pretoria, South Africa (M. Sharifpur).

Journal volume & issue: Vol. 57
p. 107424

Abstract

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In this research, we conduct a computational investigation into the mixed convection flow of copper/water nanofluids (NFs) within a rectangular cavity, utilizing the Lattice Boltzmann Method (LBM). The cavity is uniquely configured with five high-temperature obstructions (HOBs), and we vary their dimensions and positions to evaluate Nusselt numbers (Nu) across a range of Richardson numbers (Ri). The three walls of the cavity, excluding the moveable top wall, are thermally insulated, while the latter is maintained at a lower temperature. A constant magnetic field (MCF) exerts influence within the cavity, with Ri spanning from 0.01 to 100, HOBs ranging from 0.1 to 0.5, and HOBs at the bottom wall spanning from 0.25 to 0.4. This numerical investigation is executed using a customized in-house code, focusing on examining heat transfer (HTR) dynamics within the cavity. Our findings reveal that augmenting the height of the HOBs and positioning them closer to the cold wall significantly enhances the average Nusselt number (Nuav). Conversely, an increase in Ri leads to a reduction in Nuav on the cold wall. Specifically, the most notable enhancement, with a 66.7 % increase in Nuav, occurs at Ri = 0.01 when HOBs are elevated from 0.1 to 0.5. On the other hand, an increment in Ri from 0.01 to 100 results in a 79.4 % reduction in Nuav. Furthermore, elevating the HOBs from 0.25 to 0.4 produces a substantial 44.3 % increase in Nuav.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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