表面加工管束的垂下液膜沸腾换热强化的实验研究

Enhancement of Boiling Heat Transfer of Falling Fluid Film on Horizontal Structured Surface Tube Arraies

常压状态下，对饱和水和饱和Ｒ１１两种工质在光滑管束和两种机械加工管束上的垂下液膜的对流和沸腾传热特性进行了实验研究．发现在低热负荷条件下，加工管束的平均换热系数比光滑管提高了３～１０倍，具有显著的换热强化作用．其机理是，在低热负荷情况时加工管的表面出现了局部沸腾现象，从而使加工管的换热性能得到大幅度改善．

An experimental study is made for enhancing the boiling and evaporating heat transfer of water and R11 film falling on the horizontal smooth tube arraries and two kinds of structured Surface tube arraies under atmospheric Pressure. Experimental results show that the structured surface tubes increase the average heat transfer coefficients three to ten times than the same case of the smooth tubes in the low heat flux regions and have a very effective heat transfer enhancements.