摘要
为获得液滴撞击薄液膜换热机理,基于界面法向近似的能量跳跃模型和单元交替算法,建立了新型液滴撞击液膜相变传热传质模型。通过实验验证证明了模型的可靠性。采用该模型研究了有无气泡、液膜厚度、液滴速度3种因素对于液膜内传热的影响。结果表明,3种影响因素中液膜厚度影响最大,液膜越薄越有利于换热,薄液膜情况峰值壁面传热系数约是厚液膜情况的8倍。相对于液膜厚度,液滴速度和有无气泡对壁面传热系数的影响总体上不明显。但是液滴速度的增加明显缩短壁面传热系数峰值点出现的时间,而有气泡情况壁面传热系数随时间波动变化特征更明显。
In order to obtain the heat transfer mechanism of droplet impingement on thin liq-uid film,a novel droplet impingement on liquid film phase change heat and mass transfer model was established based on the energy jump model of interface normal approximation and cell alter-nation algorithm.The reliability of the model was proved by experimental verification.The influ-ence of three factors,namely,the presence or absence of bubbles,the thickness of the liquid film and the droplet velocity,on the heat transfer within the liquid film were investigated using the model.The results show that the liquid film thickness has the greatest influence among the three factors,and the thinner the liquid film is,the more favorable it is for heat transfer,and the peak wall heat transfer coefficient in the case of a thin liquid film is about eight times of that in the case of a thick liquid film.The effects of droplet velocity and the presence or absence of bubbles on the wall heat transfer coefficient were generally insignificant compared to the film thickness.Howev-er,the increase in droplet velocity significantly shortens the time to the peak wall heat transfer co-efficient,and the time-dependent fluctuation of the wall heat transfer coefficient in the presence of bubbles is more pronounced.
作者
侯燕
马新飞
刘学厅
胡鑫
Hou Yan;Ma Xinfei;Liu Xueting;Hu Xin(School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《低温工程》
北大核心
2025年第4期84-91,共8页
Cryogenics
基金
北京市教委科研计划一般项目(KM202410017009)。
关键词
喷雾冷却
液滴撞击
核态沸腾
相变模型
气液界面
spray cooling
droplet impact
nucleate boiling
phase change model
vapor-liquid interface
作者简介
侯燕,女,37岁,博士,讲师。
