THERMAL SCIENCE

International Scientific Journal

Mingzheng Ye

,

Tingxiang Yan

,

Jin Wang

,

Yongqing He

,

Jiří Jaromír Klemeš

EXPERIMENTAL STUDY ON HEAT TRANSFER PERFORMANCE AND FLOW VISUALIZATION IN MICROCHANNELS WITH MICROPILLARS

ABSTRACT
This research investigated heat transfer performance and flow characteristics of three polydimethylsiloxane microchannels full of deionised water as a working fluid. A single micropillar, horizontal micropillars, and vertical micropillars along the flow direction were prepared on the microchannels experimentally. Results show that the Nusselt number of microchannels with two horizontal micropillars is 19% higher than that with a single micropillar. The microchannel with two vertical micropillars has the Nusselt number is 29% higher than that with a single micropillar, which shows the best performance on the heat transfer enhancement. Visualization experiments of the flow field were carried out to explore the enhanced mechanism of the heat transfer for microchannels with various micropillar arrangements. When the flow rate is 7 mLpm, the maximum velocities near the single cylinder and the horizontal micro-column are 0.5 m/s and 0.52 m/s. Fluid velocity in a region between two vertical micropillars reaches 0.72 m/s when the flow rate is 7 mLpm. The fluid in the high-speed region is fully mixed around the micropillar, which reduces the stagnation region area down-stream of the vertical micropillar and enhances heat transfer.
KEYWORDS
Heat Transfer Enhancement, microchannel, micropillar, particle image velocimetry, stagnation region
PAPER SUBMITTED: 2022-02-04
PAPER REVISED: 2022-04-03
PAPER ACCEPTED: 2022-04-23
PUBLISHED ONLINE: 2022-10-29
DOI REFERENCE: https://doi.org/10.2298/TSCI2205169Y
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 5, PAGES [4169 - 4178]
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Experimental study on heat transfer performance and flow visualization in microchannels with micropillars

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