Numerical study of the interactions and merge of multiple bubbles during convective boiling in micro channels

被引：19
|
作者：
Liu, Qingming [1 ]
Wang, Wujun [1 ]
Palm, Bjorn [1 ]
机构：
[1] Royal Inst Technol KTH, Dept Energy Technol, S-10044 Stockholm, Sweden
来源：
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER | 2017年 / 80卷
关键词：
CFD; Heat transfer; Boiling; Bubbles; Evaporation; Multi-phase flow; Micro-channels; EVAPORATIVE HEAT-TRANSFER; OF-FLUID METHOD; ELONGATED BUBBLES; FLOW; MODEL; MICROCHANNELS; SIMULATION; MECHANISMS; TRANSITION; DYNAMICS;
D O I：
10.1016/j.icheatmasstransfer.2016.11.009
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Multi bubbles interaction and merger in a micro-channel flow boiling has been numerically studied. Effects of mass flux (56, 112, 200, and 335 kg/m(2) * s), wall heat flux (5, 10, and 15 kW/m(2)) and saturated temperature (300.15 and 303.15 K) are investigated. The coupled level set and volume of fluid (CLSVOF) method and non equilibrium phase model are implemented to capture the two-phase interface, and the lateral merger process. It is found that the whole transition process can be divided to three sub-stages: sliding, merger, and post-merger. The evaporation rate is much higher in the first two stages due to the boundary layer effects in. Both the mass flux and heat flux affect bubble growth. Specifically, the bubble growth rate increase with the increase of heat flux, or the decrease of mass flux. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：10 / 17
页数：8
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