光管及窄环隙流道池沸腾换热实验研究

EXPERIMENTAL INVESTIGATION OF POOL BOILING HEAT TRANSFER ON BARE TUBE AND IN NARROW ANNULI

本文在常压下以水为工质，对管外及窄环隙流道池沸腾换热进行了可视化实验，结果表明：汽泡扰动并不是沸腾换热系数高的主要原因，液体过冷使核沸腾的换热能力降低，窄隙流道内的沸腾换热机理与普通的大容积沸腾没有明显区别。文中还根据观察和测量到的结果对一些换热现象重新进行了解释。

Boiling heat transfer from bare tube and in narrow annuli was experimentally studied. The results indicated that the disturbance of vapor bubble is not the major reason why boiling heat transfer coefficient is high, liquid subcooling makes boiling heat transfer capacity decreased, and the mechanism of boiling heat transfer in narrow space has no obvious difference compared with conven- tional pool boiling. Based on the visualization and measurement, some heat transfer phenomena were reinterpreted.