Point heat sink induced by droplet train impingement

A point heat sink is produced by impinging a high frequency microscale droplet stream onto a superheated copper substrate. Although the overall target surface area is larger than the liquid-solid interface by two or three orders of magnitude, the thermal energy is mainly removed through the point he...

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Main Authors: Qiu, Lu, Dubey, Swapnil, Choo, Fook Hoong, Duan, Fei
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2017
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Online Access:https://hdl.handle.net/10356/83318
http://hdl.handle.net/10220/42566
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-833182021-01-13T07:08:58Z Point heat sink induced by droplet train impingement Qiu, Lu Dubey, Swapnil Choo, Fook Hoong Duan, Fei School of Mechanical and Aerospace Engineering Energy Research Institute @ NTU (ERI@N) Thermocouples Fluid drops A point heat sink is produced by impinging a high frequency microscale droplet stream onto a superheated copper substrate. Although the overall target surface area is larger than the liquid-solid interface by two or three orders of magnitude, the thermal energy is mainly removed through the point heat sink rather than the rest dry area. Therefore, the spherical conduction patterns in the solid materials are observed with a “nozzle-shifting” method which requires only two temperature probes. The temperature gradient in the vicinity of the impingement stagnation point is tremendously high, suggesting that the liquid-solid interface temperature is significantly lower than the far-field bulk temperature of the substrate. Moreover, the liquid-to-solid heat transfer is measured, which agrees well with the theoretical prediction. The maximum interface heat flux can reach around 80 W/mm2. It is insensitive to the substrate temperature in a relatively wide temperature range, which brings conveniences to the potential industrial applications. NRF (Natl Research Foundation, S’pore) Published version 2017-06-02T08:29:05Z 2019-12-06T15:19:52Z 2017-06-02T08:29:05Z 2019-12-06T15:19:52Z 2017 Journal Article Qiu, L., Dubey, S., Choo, F. H., & Duan, F. (2017). Point heat sink induced by droplet train impingement. Applied Physics Letters, 110(19), 191903-. 0003-6951 https://hdl.handle.net/10356/83318 http://hdl.handle.net/10220/42566 10.1063/1.4983463 en Applied Physics Letters © 2017 American Institute of Physics (AIP). This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: [http://dx.doi.org/10.1063/1.4983463]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 4 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Thermocouples
Fluid drops
spellingShingle Thermocouples
Fluid drops
Qiu, Lu
Dubey, Swapnil
Choo, Fook Hoong
Duan, Fei
Point heat sink induced by droplet train impingement
description A point heat sink is produced by impinging a high frequency microscale droplet stream onto a superheated copper substrate. Although the overall target surface area is larger than the liquid-solid interface by two or three orders of magnitude, the thermal energy is mainly removed through the point heat sink rather than the rest dry area. Therefore, the spherical conduction patterns in the solid materials are observed with a “nozzle-shifting” method which requires only two temperature probes. The temperature gradient in the vicinity of the impingement stagnation point is tremendously high, suggesting that the liquid-solid interface temperature is significantly lower than the far-field bulk temperature of the substrate. Moreover, the liquid-to-solid heat transfer is measured, which agrees well with the theoretical prediction. The maximum interface heat flux can reach around 80 W/mm2. It is insensitive to the substrate temperature in a relatively wide temperature range, which brings conveniences to the potential industrial applications.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Qiu, Lu
Dubey, Swapnil
Choo, Fook Hoong
Duan, Fei
format Article
author Qiu, Lu
Dubey, Swapnil
Choo, Fook Hoong
Duan, Fei
author_sort Qiu, Lu
title Point heat sink induced by droplet train impingement
title_short Point heat sink induced by droplet train impingement
title_full Point heat sink induced by droplet train impingement
title_fullStr Point heat sink induced by droplet train impingement
title_full_unstemmed Point heat sink induced by droplet train impingement
title_sort point heat sink induced by droplet train impingement
publishDate 2017
url https://hdl.handle.net/10356/83318
http://hdl.handle.net/10220/42566
_version_ 1690658357552087040