Analysis of two-phase pressure drop fluctuations during micro-channel flow boiling

被引：57
作者：
Wang, Yuan [1 ]
Sefiane, Khellil [2 ]
Wang, Zhen-guo [1 ]
Harmand, Souad [3 ]
机构：
[1] Natl Univ Def Technol, Sci & Technol Scramjet Lab, Changsha 410073, Hunan, Peoples R China
[2] Univ Edinburgh, Sch Engn, Edinburgh EH9 3JL, Midlothian, Scotland
[3] Univ Valenciennes, TEMPO, UVHC, F-59313 Valenciennes, France
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2014年 / 70卷
基金：
英国工程与自然科学研究理事会;
关键词：
Flow boiling; Instability; Pressure drop fluctuation; Micro-channel; HEAT-TRANSFER; PARALLEL MICROCHANNELS; SINGLE MICROCHANNEL; ELECTRONIC DEVICES; INSTABILITIES; CHANNEL; SINK;
D O I：
10.1016/j.ijheatmasstransfer.2013.11.012
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Two-phase pressure drop fluctuations during flow boiling in single micro-channel were experimentally investigated. Degassed FC-72 was tested in micro-channels with a hydraulic diameters of 571 mu m, 762 mu m and 1454 pin (the aspect ratio (W-in/d(in)) is 20,20 and 10) at liquid mass fluxes of 11.2 kg m(-2) s(-1), 22.4 kg m(-2) s(-1) and 44.8 kg m(-2) s(-1) and heat fluxes of 0-18.31 kW m(-2). Flow instabilities were analysed based on the two-phase pressure drop, synchronous visualisation results and thermographic measurements of the channel surface temperature profiles. Low-frequency high-amplitude fluctuation and high-frequency low-amplitude fluctuation are identified, the main causes of which were found to be the periodic reverse and rewetting flow and the vapour slug cluster passage respectively. The analysis based on a non-dimensional parameter K-1 helps to better understand the dominant influence on the liquid-vapour interface movement during flow boiling. Effects of heat flux, mass flux and channel hydraulic diameter on the pressure drop fluctuation were discussed. Besides, the coefficient of variation of the pressure drop was calculated to further explore the impact of experimental conditions on the flow boiling instabilities in the high aspect ratio micro-channels. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：353 / 362
页数：10
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