微重力池沸腾现象中的汽泡脱落直径  

BUBBLE DEPARTURE DIAMETER IN MICROGRAVITY POOL BOILING

作　　者：刘刚[1] 赵建福[1] 万士昕[1] 闫娜[1] 

机构地区：[1]中国科学院力学研究所国家微重力实验室,北京100080

出　　处：《工程热物理学报》2008年第1期93-95,共3页Journal of Engineering Thermophysics

基　　金：中国科学院知识创新工程(No.KJCX2-SW-L05);国家自然科学基金(No.10432060)

摘　　要：本文报道了空间微重力池沸腾过程中的汽泡脱落现象,观测到微重力条件下小汽泡行为与常重力时相似,但在中等尺寸范围内,汽泡往往粘附在加热丝上做横向振动,并不断合并所碰到的小汽泡,直到超过临界尺寸后脱落。本文在Lee模型(1992)的基础上引入热毛细作用力,成功地解释了实验观测到的独特的汽泡动力学行为特征。In the present paper, the phenomenon of the bubble departure pool boiling in microgravity are reported. The same behavior of tiny bubbles can be observed both in microgravity and in normal gravity. On the contrary, the bigger bubbles with about several millimeters in diameter stay on the wire, oseilate along the wire, and coalesce with adjacent bubbles till its size exceeds another critical value. Considering the Marangoni effect, a mechanistic model about bubble departurement is presented, based on the model of Lee （1992）, to reveal the mechanism underlying this phenomenon. The predictions consist with the experimental observations qualitatively.

关 键 词：微重力 池沸腾 汽泡脱落直径 铂丝 

分 类 号：TK124[动力工程及工程热物理—工程热物理]