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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F22%3APU147609" target="_blank" >RIV/00216305:26210/22:PU147609 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.doiserbia.nb.rs/img/doi/0354-9836/2022/0354-98362205169Y.pdf" target="_blank" >http://www.doiserbia.nb.rs/img/doi/0354-9836/2022/0354-98362205169Y.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2298/TSCI2205169Y" target="_blank" >10.2298/TSCI2205169Y</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

<a href="/cs/project/EF15_003%2F0000456" target="_blank" >EF15_003/0000456: Laboratoř integrace procesů pro trvalou udržitelnost</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Thermal Science

ISSN

0354-9836

e-ISSN

2334-7163

Svazek periodika

5

Číslo periodika v rámci svazku

25

Stát vydavatele periodika

RS - Srbská republika

Počet stran výsledku

10

Strana od-do

4169-4178

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85140617242