Investigation of bubble departure radius in subcooled pool boiling under microgravity condition
(2018) ASME 2018 International Mechanical Engineering Congress and Exposition, IMECE 2018 8A-2018.- Abstract
The bubble departure radius is a very important parameter for bubble dynamics during boiling heat transfer. In this study, experiments of highly subcooled nucleate pool boiling of FC-72 were conducted on two different sized silicon chips (chip S 2×2 and chip S 1×1) in short-term microgravity and normal gravity conditions by utilizing the drop tower in Beijing. During the experimental study, bubble dynamics were captured by a high-speed digital camera. From the images at the bubble departure moment, the bubble departure radius was obtained. Although the traditional force balance model is modified through the addition of a Marangoni force, it still cannot precisely predict the bubble departure radius in the microgravity condition,... (More)
The bubble departure radius is a very important parameter for bubble dynamics during boiling heat transfer. In this study, experiments of highly subcooled nucleate pool boiling of FC-72 were conducted on two different sized silicon chips (chip S 2×2 and chip S 1×1) in short-term microgravity and normal gravity conditions by utilizing the drop tower in Beijing. During the experimental study, bubble dynamics were captured by a high-speed digital camera. From the images at the bubble departure moment, the bubble departure radius was obtained. Although the traditional force balance model is modified through the addition of a Marangoni force, it still cannot precisely predict the bubble departure radius in the microgravity condition, especially in the low heat flux regime. By using the advancing contact angle measured from the bubble departure moment instead of the static contact angle, and considering the bubble asymmetry due to the small bubble coalescence and the surrounding liquid motion, a revised force balance model is proposed. It can predict the experimental bubble departure radius within a deviation of ±3.8% for both silicon chips in the whole heat flux range.
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- author
- Wang, Xueli LU ; Wu, Zan LU ; Wei, Jinjia and Sunden, Bengt LU
- organization
- publishing date
- 2018
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Boiling regime, Bubble departure radius, Force balance model, Microgravity, Pool boiling
- host publication
- Heat Transfer and Thermal Engineering
- volume
- 8A-2018
- publisher
- American Society Of Mechanical Engineers (ASME)
- conference name
- ASME 2018 International Mechanical Engineering Congress and Exposition, IMECE 2018
- conference location
- Pittsburgh, United States
- conference dates
- 2018-11-09 - 2018-11-15
- external identifiers
-
- scopus:85063130675
- ISBN
- 9780791852118
- DOI
- 10.1115/IMECE2018-87741
- language
- English
- LU publication?
- yes
- id
- cb998457-6c74-4f17-b03d-ee9f7101ba34
- date added to LUP
- 2019-04-05 14:56:17
- date last changed
- 2023-09-08 21:18:12
@inproceedings{cb998457-6c74-4f17-b03d-ee9f7101ba34,
abstract = {{<p>The bubble departure radius is a very important parameter for bubble dynamics during boiling heat transfer. In this study, experiments of highly subcooled nucleate pool boiling of FC-72 were conducted on two different sized silicon chips (chip S 2×2 and chip S 1×1) in short-term microgravity and normal gravity conditions by utilizing the drop tower in Beijing. During the experimental study, bubble dynamics were captured by a high-speed digital camera. From the images at the bubble departure moment, the bubble departure radius was obtained. Although the traditional force balance model is modified through the addition of a Marangoni force, it still cannot precisely predict the bubble departure radius in the microgravity condition, especially in the low heat flux regime. By using the advancing contact angle measured from the bubble departure moment instead of the static contact angle, and considering the bubble asymmetry due to the small bubble coalescence and the surrounding liquid motion, a revised force balance model is proposed. It can predict the experimental bubble departure radius within a deviation of ±3.8% for both silicon chips in the whole heat flux range.</p>}},
author = {{Wang, Xueli and Wu, Zan and Wei, Jinjia and Sunden, Bengt}},
booktitle = {{Heat Transfer and Thermal Engineering}},
isbn = {{9780791852118}},
keywords = {{Boiling regime; Bubble departure radius; Force balance model; Microgravity; Pool boiling}},
language = {{eng}},
publisher = {{American Society Of Mechanical Engineers (ASME)}},
title = {{Investigation of bubble departure radius in subcooled pool boiling under microgravity condition}},
url = {{http://dx.doi.org/10.1115/IMECE2018-87741}},
doi = {{10.1115/IMECE2018-87741}},
volume = {{8A-2018}},
year = {{2018}},
}