Detail publikace
EXPERIMENTAL STUDY ON HEAT TRANSFER PERFORMANCE AND FLOW VISUALIZATION IN MICROCHANNELS WITH MICROPILLARS
Ye M. Yan T. Wang J. He Y. Klemeš J.J.
Anglický název
EXPERIMENTAL STUDY ON HEAT TRANSFER PERFORMANCE AND FLOW VISUALIZATION IN MICROCHANNELS WITH MICROPILLARS
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
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. Re-sults show that the Nusselt number of microchannels with two horizontal mi-cropillars 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 ex-plore the enhanced mechanism of the heat transfer for microchannels with vari-ous micropillar arrangements. When the flow rate is 7 mLpm, the maximum ve-locities 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. © 2022 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This is an open access article distributed under the CC BY-NC-ND 4.0 terms and conditions.
Anglický abstrakt
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. Re-sults show that the Nusselt number of microchannels with two horizontal mi-cropillars 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 ex-plore the enhanced mechanism of the heat transfer for microchannels with vari-ous micropillar arrangements. When the flow rate is 7 mLpm, the maximum ve-locities 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. © 2022 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This is an open access article distributed under the CC BY-NC-ND 4.0 terms and conditions.
Klíčová slova anglicky
Heat transfer enhancement; Microchannel; Micropillar; Particle image velocimetry; Stagnation region
Vydáno
23.04.2022
Nakladatel
VINČA Institute of Nuclear Sciences
Místo
Mike Petrovića Alasa 12, 11000 Belgrade, Vinča, Serbia
ISSN
0354-9836
Ročník
5
Číslo
25
Strany od–do
4169–4178
Počet stran
10
BIBTEX
@article{BUT182757,
author="Jin {Wang} and Jiří {Klemeš},
title="EXPERIMENTAL STUDY ON HEAT TRANSFER PERFORMANCE AND FLOW VISUALIZATION IN MICROCHANNELS WITH MICROPILLARS",
year="2022",
volume="5",
number="25",
month="April",
pages="4169--4178",
publisher="VINČA Institute of Nuclear Sciences",
address="Mike Petrovića Alasa 12, 11000 Belgrade, Vinča, Serbia",
issn="0354-9836"
}