標題: Experimental study on bubble characteristics of time periodic subcooled flow boiling in annular ducts due to wall heat flux oscillation
作者: Chen, A.
Lin, T. F.
Ali, Hafiz Muhammad
Yan, Wei-Mon
機械工程學系
Department of Mechanical Engineering
關鍵字: Heat flux oscillation;Time periodic subcooled flow boiling;R-134a;Bubble characteristics;Mini-channel
公開日期: 1-Aug-2020
摘要: The significant effects of imposed wall heat flux oscillation on bubble characteristics of subcooled flow boiling with R-134a in horizontal annular ducts are experimentally performed in details. Specific emphasis has been applied on the bubble dynamics of the time periodic subcooled flow boiling characteristics influenced by the mean levels, amplitudes, and periods of the wall heat flux oscillations. The obtained experimental results have disclosed that the bubble parameters like the departure diameter, frequency and active nucleation site density, do oscillate periodically in time and are at the same frequency as the imposed wall heat flux oscillation. Nevertheless, these parameters also increase at long periods, high amplitudes of imposed heat flux oscillation or high values of mean imposed heat flux. Furthermore, the bubble size reduced after the time lag when the imposed heat flux decreases with time. (C) 2020 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.119974
http://hdl.handle.net/11536/154972
ISSN: 0017-9310
DOI: 10.1016/j.ijheatmasstransfer.2020.119974
期刊: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume: 157
起始頁: 0
結束頁: 0
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