核态沸腾中汽化核心密度的预测  

Prediction of the Nucleation Site Density in Nucleate Boiling

作　　者：贾涛[1] 刁彦华[2] 唐大伟[1] 

机构地区：[1]中国科学院工程热物理研究所,北京市海淀区100080 [2]中国科学院电工研究所,北京市海淀区100080

出　　处：《中国电机工程学报》2006年第16期122-125,共4页Proceedings of the CSEE

摘　　要：提出了一种基于沸腾表面微结构分析的预测核态沸腾中汽化核心密度的方法。通过对沸腾表面微结构进行分析,沸腾表面上具备贮藏气体条件的凹坑被识别出来,并且得到一个这些具备贮藏气体条件凹坑的开口半径的数据集合。然后用不同的测量尺度去分析这个数据集合。对于一个特定的测量尺度,存在一个相应的测量结果。这个测量结果是上述数据集合中所包含的大于测量尺度的数据的数量除以沸腾表面上的实际考察的面积。这里的测量尺度和测量结果可以分别被视为最小成核直径和汽化核心密度。上述离散的测量尺度和测量结果的数据可以被拟合成一个数学公式。这个数学公式可以被用以预测汽化核心密度和最小成核半径之间的关系。预测结果和实验数据吻合,并且表明汽化核心密度和最小成核半径之间为分形的关系。A method has been presented to predict the nucleation site density in nucleate boiling based on the investigation of the microstructure of boiling surface. Through the investigation, the gas trapping cavities on boiling surface are identified and a data set of the mouth diameters of gas trapping cavities is got. Then many different measurement scales are employed to analyze the data set. For a certain measurement scale, there is a corresponding measurement result which is division of the number of the data （in the data set） greater than the measurement scale by the actual investigated area on the boiling surface. The measurement scale and the measurement result here can be viewed as the minimum nucleation diameter and the nucleation site density respectively. And then the above discrete data of measurement scales and measurement results are fitted by a mathematical formula which is used to predict the relationship between the nucleation site densities and the minimum nucleation radius. The prediction agrees well with the experimental data and shows that it is the fractal relationship between the nucleation site density and the minimum nucleation radius.

关 键 词：核态沸腾 汽化核心密度 最小成核半径 测量尺度 分形 

分 类 号：TK124[动力工程及工程热物理—工程热物理]