THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Jincai Zhu

,

Ding Yuan

,

Fan Sun

,

Yan’e Hu

NUMERICAL STUDY OF LONGITUDINAL VORTEX AND CHAOTIC FLOW ON HEAT TRANSFER CHARACTERISTIC IN MICROCHANNELS

ABSTRACT
In this study, the flow characteristics and heat transfer mechanism of the chaotic flow induced by a micro-channel containing staggered herringbone micro-structures (CM), longitudinal vortex induced by a micro-channel containing inclined ribs (SLM), and a smooth micro-channel (SM) were comprehensively analyzed through numerical simulations at Reynolds number of 164 to 965. The results demonstrated that the primary enhanced heat transfer mechanism of the single longitudinal vortex was the disruption of the thermal boundary-layer, whereas the chaotic flow enhanced heat transfer by facilitating fluid mixing. Furthermore, the longitudinal vortex decay is slower than that of the chaotic flow, resulting in SLM having a superior heat transfer performance at lower pressure drops compared with the CM. Further results showed that the SLM had the highest Nusselt number (Nu = 28), the best comprehensive evaluation factor (PEC = 2.1), and the lowest thermal resistance (RT = 0.6 K/W).
KEYWORDS
microchannels, Single longitudinal vortex, Chaotic flow, heat transfer, Flow analysis
PAPER SUBMITTED: 2024-06-18
PAPER REVISED: 2024-06-28
PAPER ACCEPTED: 2024-08-08
PUBLISHED ONLINE: 2024-11-09
DOI REFERENCE: https://doi.org/10.2298/TSCI240618252Z
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 6, PAGES [4805 - 4814]
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Numerical study of longitudinal vortex and chaotic flow on heat transfer characteristic in microchannels

© 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