微重力流动沸腾气泡脱离机制  

Bubble departure mechanism in microgravity flow boiling

作　　者：高旭[1,2] 王学会[2] 雷刚 郑豪策 韩晓红[2] 陈光明[2] 

机构地区：[1]航天低温推进剂技术国家重点实验室,北京100028 [2]浙江大学制冷与低温研究所,杭州310027

出　　处：《低温工程》2015年第2期7-11,27,共6页Cryogenics

基　　金：航天低温推进剂技术国家重点实验室基金课题(SKLTSCP1205、SKLTSCP1314)

摘　　要：为了研究微重力条件下的流动沸腾换热过程气泡脱离的特点,研究了气泡在脱离过程中的受力情况,推导并给出了气泡在切向方向和垂直方向上的粘滞力、浮力、附加压力、惯性力的表达式,并在此基础上提出了气泡从加热表面脱离特性的分析模型。研究结果表明,在微重力下气泡的长大时间明显比常重力下大,对应的气泡脱离直径比常重力下也大。随着工质流速的增加,气泡的脱离直径逐步变小,当工质流速达到一定值后,常重力和微重力下气泡的脱离半径差别可以忽略不计。In order to figure out the characteristics of the bubble departure of the flow boiling in the microgravity,the force exerted on the bubble were analyzed.The expressions of the viscous force,buoyancy force,additional force caused by the surface and the inertia force of the bubble were deduced both in the direction of the tangential and normal.Furthermore,the analysis model of the bubble departure from the heating surface was proposed.The conclusions indicated that the growing time of the bubble in the microgravity was much longer than that in the normal gravity,and the departure diameter of the bubble was larger,too.With the increasing of the velocity of the working fluid,the departure diameter of the bubble decreased.The difference of the departure diameter in the microgravity and in the normal gravity could be ignored when the velocity of the working fluid beyond a certain value.

关 键 词：微重力 沸腾 传热 气泡动力学 脱离直径 

分 类 号：TB611[一般工业技术—制冷工程]