THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

Jincai Zhu

,

Ding Yuan

,

Fan Sun

,

Yan’e Hu

online first only

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 microchannel containing staggered herringbone microstructures (CM), longitudinal vortex induced by a microchannel containing inclined ribs (SLM), and a smooth microchannel (SM) were comprehensively analyzed through numerical simulations at Reynolds number (Re) 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 (Nu=28), the best comprehensive evaluation factor (PEC) (PEC=2.1), and the lowest thermal resistance RT (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
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Numerical study of longitudinal vortex and chaotic flow on heat transfer characteristic in microchannels