摘要
狭窄空间中的池沸腾传热强度高于大空间池沸腾，其主导传热机理是受压变形气泡底部的微液膜蒸发机理。而极限偏心环缝通道不仅有利于微膜蒸发机理的有效实现，更有其自身特点：尖角处具有人工气化核心作用，还兼有宽缝区的供液功能。文中以液氮为工质进行了相关实验，结果表明，该结构形式的通道具有很好的换热性能，换热系数为同等热流密度下光管的３～５倍。
The boiling heat transfer rate in a narrow gap is much higher than that in a pool, and its heat transfer mechanism is dominated by the evaporation of thin liquid film under deformed bubbles. The extreme eccentric annulus has the same effective heat transfer mechanism, as well as its own characteristics: the sharp-angled region acts as an artificial vaporization nucleation, and the wide gap region supplies liquid. An experiment is performed for liquid nitrogen in this paper. It is assumed from the study result that this type channel has a well heat transfer behavior, and its heat transfer coefficient is about 3-5 times of that of smooth tube.
出处
《低温与超导》
CAS
CSCD
北大核心
1998年第3期47-52,共6页
Cryogenics and Superconductivity
关键词
极限偏心
微膜蒸发
传热强化
液氮
沸腾换热
Extreme eccentric, Narrow channel, Thin liquid film evaporation, Heat transfer enhancement.
