池式沸腾中单气泡成长的数值模拟  

Numerical Simulation of Single Bubble Growth in Pool Boiling

作　　者：程宁 余述文 宋振国[1] CHENG Ning;YU Shu-wen;SONG Zhen-guo(China Ship Development and Design Center,Wuhan 430064,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国舰船研究设计中心,武汉430064 [2]中国科学技术大学,合肥230026

出　　处：《船海工程》2022年第S02期16-21,共6页Ship & Ocean Engineering

基　　金：国家自然科学基金(51709249;11305169)。

摘　　要：为从机理上研究气泡的成长问题,搭建可视化的单气泡成长实验台架,在常压条件下的过冷沸腾水中进行单个气泡的成长实验。实验中采用高速摄影仪和热电偶分别记录2例气泡成长过程中的气泡尺寸、形状,以及壁面温度,通过假设与理论分析得到热流变化,依据热流对整个过程进行数值模拟,得到气泡尺寸、气泡形状。数值模拟的结果验证了理论分析的合理性与正确性,因为计算得到的气泡尺寸与实验结果十分接近,同时还发现在忽略气泡顶部冷凝的情况下,实验中的2个气泡底部液体微层的蒸发量占总蒸发量的比例均超过45%。In order to study the mechanism of bubble growth,a visual single-bubble growth test bench was set up and the bubble growth experiment in subcooled boiling water under normal pressure condition was conducted.In the experiment,high-speed camera and thermocouple were used to record the bubble size,shape and wall temperature during the growth of two bubbles.The heat flow changes were obtained by hypothesis and theoretical analysis,and then a numerical simulation of the whole process was conducted according to the heat flows.The bubble size and bubble shape were obtained.The simulation results can confirm the rationality and correctness of the theoretical analysis,for the bubble size is highly close to the experiment data and it also indicated that the evaporation of the microlayer accounts for more than 45%of the total evaporation in the case of igniting the condensation of the top of the bubble in this experiment.

关 键 词：池式沸腾 气泡成长 可视化实验 数值模拟 

分 类 号：U661.1[交通运输工程—船舶及航道工程]