THERMAL SCIENCE

International Scientific Journal

Xuechun Wan

,

Ding Yuan

,

Zhiyong Che

,

Zhujun Li

,

Yifei Liu

,

Jincai Zhu

ANALYSIS OF HEAT TRANSFER MECHANISMS IN MICRO-CHANNELS WITH DIFFERENT VORTEX-INDUCING MICRO-STRUCTURES

ABSTRACT
In this study, the flow characteristics and heat transfer mechanism of longitudinal vortices induced by a micro-channel containing double-row rib micro-structures (DLM), a micro-channel containing single-row rib micro-structures (SLM), and a smooth micro-channel (SM) were comprehensively analyzed through numerical simulations at Reynolds numbers (Re = 164-965). It was found that the SLM had the highest Nusselt number (Nu =2 8) and the best comprehensive evaluation factor (PEC) (PEC = 2.1). The study revealed that the primary mechanism for enhancing heat transfer in SLM was the disruption of the thermal boundary-layer. This led to improved heat transfer performance in SLM, despite its fewer longitudinal vortices compared to DLM. Flow analysis revealed that the formation of two longitudinal vortices created a lubrication-like effect in DLM. Consequently, the pressure drop observed in DLM was 28% lower than that in SLM, and the intensity of the vortices was also found to be less than that of SLM.
KEYWORDS
microchannel, Longitudinal Vortices, thermal-hydraulic characteristics, Heat Transfer Enhancement
PAPER SUBMITTED: 2025-04-05
PAPER REVISED: 2025-06-15
PAPER ACCEPTED: 2025-06-23
PUBLISHED ONLINE: 2025-07-05
DOI REFERENCE: https://doi.org/10.2298/TSCI250405121W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 5, PAGES [3591 - 3601]
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Analysis of heat transfer mechanisms in micro-channels with different vortex-inducing micro-structures

2025 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