Influence of air on heat transfer of a closed-loop spray cooling system

The influence of air must be considered when designing a direct spray cooling system for electronics because of its inevitable existence. In the present study, the influence of air on spray cooling is experimentally investigated with the air volume concentration ranging from 0.06 to 0.65 and the cha...

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Main Authors: Liu, Pengfei, Kandasamy, Ranjith, Feng, Huicheng, Wong, Teck Neng, Toh, Kok Chuan
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/160943
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1609432022-08-08T05:12:41Z Influence of air on heat transfer of a closed-loop spray cooling system Liu, Pengfei Kandasamy, Ranjith Feng, Huicheng Wong, Teck Neng Toh, Kok Chuan School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Spray Cooling Non-Condensable Gas The influence of air must be considered when designing a direct spray cooling system for electronics because of its inevitable existence. In the present study, the influence of air on spray cooling is experimentally investigated with the air volume concentration ranging from 0.06 to 0.65 and the chamber total pressure from 0.44 bar to 1.07 bar. Two dielectric fluids (PF-5060 and FC-3284) are studied due to their compatibility with electronics. The results show that in the current experimental range the spray cooling is mainly affected by the liquid subcooling and surface superheat when air is present. The chamber total pressure appears to have a negligible influence on the spray cooling heat transfer, which differs from the spray cooling behavior without air. This argument holds true from the incidence of nucleate boiling to near the transition boiling regime as long as there is a sufficient amount of air present in the system. The air-entrainment-induced secondary nucleation can possibly leads to the insensitivity of the spray cooling heat transfer to the system pressure. A correlation is developed by incorporating the influence of the spray characteristics, the liquid properties, the chamber pressure, the degree of liquid subcooling, and the surface superheat. It provides a good prediction of the heat transfer rate for air-present spray cooling under current experimental conditions. National Research Foundation (NRF) This research is supported by National Research Foundation, Prime Minister’s Office, Singapore under its Green Data Centre Research Programme (NRF2015ENC-GDCR01001-010). 2022-08-08T05:12:41Z 2022-08-08T05:12:41Z 2020 Journal Article Liu, P., Kandasamy, R., Feng, H., Wong, T. N. & Toh, K. C. (2020). Influence of air on heat transfer of a closed-loop spray cooling system. Experimental Thermal and Fluid Science, 111, 109903-. https://dx.doi.org/10.1016/j.expthermflusci.2019.109903 0894-1777 https://hdl.handle.net/10356/160943 10.1016/j.expthermflusci.2019.109903 2-s2.0-85073993999 111 109903 en NRF2015ENC-GDCR01001-010 Experimental Thermal and Fluid Science © 2019 Published by Elsevier Inc. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Spray Cooling
Non-Condensable Gas
spellingShingle Engineering::Mechanical engineering
Spray Cooling
Non-Condensable Gas
Liu, Pengfei
Kandasamy, Ranjith
Feng, Huicheng
Wong, Teck Neng
Toh, Kok Chuan
Influence of air on heat transfer of a closed-loop spray cooling system
description The influence of air must be considered when designing a direct spray cooling system for electronics because of its inevitable existence. In the present study, the influence of air on spray cooling is experimentally investigated with the air volume concentration ranging from 0.06 to 0.65 and the chamber total pressure from 0.44 bar to 1.07 bar. Two dielectric fluids (PF-5060 and FC-3284) are studied due to their compatibility with electronics. The results show that in the current experimental range the spray cooling is mainly affected by the liquid subcooling and surface superheat when air is present. The chamber total pressure appears to have a negligible influence on the spray cooling heat transfer, which differs from the spray cooling behavior without air. This argument holds true from the incidence of nucleate boiling to near the transition boiling regime as long as there is a sufficient amount of air present in the system. The air-entrainment-induced secondary nucleation can possibly leads to the insensitivity of the spray cooling heat transfer to the system pressure. A correlation is developed by incorporating the influence of the spray characteristics, the liquid properties, the chamber pressure, the degree of liquid subcooling, and the surface superheat. It provides a good prediction of the heat transfer rate for air-present spray cooling under current experimental conditions.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Liu, Pengfei
Kandasamy, Ranjith
Feng, Huicheng
Wong, Teck Neng
Toh, Kok Chuan
format Article
author Liu, Pengfei
Kandasamy, Ranjith
Feng, Huicheng
Wong, Teck Neng
Toh, Kok Chuan
author_sort Liu, Pengfei
title Influence of air on heat transfer of a closed-loop spray cooling system
title_short Influence of air on heat transfer of a closed-loop spray cooling system
title_full Influence of air on heat transfer of a closed-loop spray cooling system
title_fullStr Influence of air on heat transfer of a closed-loop spray cooling system
title_full_unstemmed Influence of air on heat transfer of a closed-loop spray cooling system
title_sort influence of air on heat transfer of a closed-loop spray cooling system
publishDate 2022
url https://hdl.handle.net/10356/160943
_version_ 1743119590918979584