THERMAL SCIENCE

International Scientific Journal

Kamel Bouaraour

,

Djemoui Lalmi

,

Sidi Mohamed Salem Mohamed

MIXED CONVECTION ANALYSIS OF NANOFLUID FLOW INSIDE AN INDENTED MICROCHANNEL

ABSTRACT
The present investigation employed computational techniques to analyze the heat transfer and fluid-flow properties of a Cu-water nanofluid moving through a rectangular micro-channel. The upper wall of the micro-channel is thermally insulated, while the lower wall is equipped with a ribbed surface maintained at a greater temperature than the fluid entering the channel. The governing equations were discretized using the finite volume method and solved using the ANSYS-FLU-ENT 16.0 CFD software. The study investigated the influence of many parameters, such as the Reynolds number (20 ≤ Re ≤ 200), volume percentages of nanoparticles (1% ≤ φ ≤ 8%), and rib height. The numerical results demonstrate that when the height of the ribs rises, e = 20 μm, e = 30 μm, and e = 40 μm, the contact surface area between the ribs and the nanofluid similarly increases. As a result, the friction factor of the heated surface rises, regardless of whether the Reynolds numbers are low or high. Furthermore, numerical analysis suggest that the aver-age friction factor diminishes as the Reynolds number rises for all rib heights. Ribs in the micro-channel facilitate improved mixing, resulting in heightened heat transfer. The impact is intensified by augmenting the concentration of nanoparticles and the Reynolds numbers at all rib heights.
KEYWORDS
heat transfer, friction factor, nanoparticles, volume fraction
PAPER SUBMITTED: 2024-02-06
PAPER REVISED: 2024-03-04
PAPER ACCEPTED: 2024-04-15
PUBLISHED ONLINE: 2024-06-22
DOI REFERENCE: https://doi.org/10.2298/TSCI240206138B
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 5, PAGES [4321 - 4331]
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Mixed convection analysis of nanofluid flow inside an indented microchannel

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence