Visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon

Flat thermosyphon (FTS) has gained wide attention in solving heat dissipation problems of data centers. The miniaturization of densely packed electronics has led to a demand for compact heat sinks. In this paper, a confined FTS consisting of an evaporator, condenser and customized quartz-glass chamb...

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Main Authors: Qin, Siyu, Liu, Yijia, Yang, Changming, Jin, Liwen, Yang, Chun, Meng, Xiangzhao
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/173314
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1733142024-01-24T00:41:24Z Visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon Qin, Siyu Liu, Yijia Yang, Changming Jin, Liwen Yang, Chun Meng, Xiangzhao School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Electronic Cooling Phase Change Heat Transfer Flat thermosyphon (FTS) has gained wide attention in solving heat dissipation problems of data centers. The miniaturization of densely packed electronics has led to a demand for compact heat sinks. In this paper, a confined FTS consisting of an evaporator, condenser and customized quartz-glass chamber was developed. Bubble behaviors were investigated by the visualization approach under vacuum conditions. Effects of the space height, nominal heating power, and liquid filling ratio on the thermal characteristics were involved. Experimental results found that the bubble behaviors with 10 mm height are different from others. For 10 mm height, bubble contacts the condensation surface and then bounces back to the evaporator. The quantitative analysis shows that the boiling heat transfer coefficient with 10 mm height is 65.5 % of that with 25 mm height, and a condensation heat transfer coefficient with 10 mm height is 58.9 % of that with 20 mm height. Increasing heating power deteriorates the condensation heat transfer via forming a bubble film on the condensation surface. A small filling ratio (30 %) with 10 mm height is beneficial for the phase change heat transfer. It is hoped that these results can offer guidance for designing effective cooling devices. The authors are grateful for the support of the National Natural Science Foundation of China (52376073), and the Key Research and Development Program of Shaanxi (2023-GHZD-54). 2024-01-24T00:41:24Z 2024-01-24T00:41:24Z 2023 Journal Article Qin, S., Liu, Y., Yang, C., Jin, L., Yang, C. & Meng, X. (2023). Visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon. Energy, 285, 129392-. https://dx.doi.org/10.1016/j.energy.2023.129392 0360-5442 https://hdl.handle.net/10356/173314 10.1016/j.energy.2023.129392 2-s2.0-85175003753 285 129392 en Energy © 2023 Elsevier Ltd. 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
Electronic Cooling
Phase Change Heat Transfer
spellingShingle Engineering::Mechanical engineering
Electronic Cooling
Phase Change Heat Transfer
Qin, Siyu
Liu, Yijia
Yang, Changming
Jin, Liwen
Yang, Chun
Meng, Xiangzhao
Visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon
description Flat thermosyphon (FTS) has gained wide attention in solving heat dissipation problems of data centers. The miniaturization of densely packed electronics has led to a demand for compact heat sinks. In this paper, a confined FTS consisting of an evaporator, condenser and customized quartz-glass chamber was developed. Bubble behaviors were investigated by the visualization approach under vacuum conditions. Effects of the space height, nominal heating power, and liquid filling ratio on the thermal characteristics were involved. Experimental results found that the bubble behaviors with 10 mm height are different from others. For 10 mm height, bubble contacts the condensation surface and then bounces back to the evaporator. The quantitative analysis shows that the boiling heat transfer coefficient with 10 mm height is 65.5 % of that with 25 mm height, and a condensation heat transfer coefficient with 10 mm height is 58.9 % of that with 20 mm height. Increasing heating power deteriorates the condensation heat transfer via forming a bubble film on the condensation surface. A small filling ratio (30 %) with 10 mm height is beneficial for the phase change heat transfer. It is hoped that these results can offer guidance for designing effective cooling devices.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Qin, Siyu
Liu, Yijia
Yang, Changming
Jin, Liwen
Yang, Chun
Meng, Xiangzhao
format Article
author Qin, Siyu
Liu, Yijia
Yang, Changming
Jin, Liwen
Yang, Chun
Meng, Xiangzhao
author_sort Qin, Siyu
title Visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon
title_short Visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon
title_full Visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon
title_fullStr Visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon
title_full_unstemmed Visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon
title_sort visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon
publishDate 2024
url https://hdl.handle.net/10356/173314
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