| 核态沸腾中汽化核心密度的分形分布 |
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| 作者姓名： | 贾 涛 刁彦华 |
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| 作者单位： | 中国科学院研究生院，工程热物理研究所，北京100080 |
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| 摘 要： | 本文首先回顾了在核态沸腾传热中影响汽化核心密度分布的几个关键因素，然后运用分形理论讨论了加热壁面微结构和汽化核心密度之间的关系并分析了两个核态沸腾实验中汽化核心密度的数据。一个实验是考察加热壁面在老化过程中汽化核心密度的变化，另一个实验是考察两个不同材料制成的加热壁面上汽化核心密度的差异。实验数据分析结果表明汽化核心密度与最小成核半径之间呈分形关系。不同加热壁面对应不同的分形维数，分形维数是一个定量描述加热壁面状况的参数。
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| 关 键 词： | 汽化核心密度 最小成核半径 分形维数 |
Fractal Distribution of Nucleation Site Density in Nucleate Boiling |
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| Authors: | JIA Tao DIAO Yan-Hua |
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| Institution: | Graduate school of Chinese Academy of Sciences, Institute of Engineering Thermophysics,Beijing,100080, China |
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| Abstract: | This paper reviews the factors affecting the distribution of nucleation site density in nucleate boiling and then uses fractal theory to discuss the relationship between boiling surface microstructure information and nucleation site density and study the data of nucleation site density in two boiling experiments: one is to investigate the change of nucleation site density during the course of aging process, the other is to investigate the difference of the nucleation site density on two boiling surfaces made of different materials. The result of experimental data analysis shows that the relationship between nucleation site density and minimum nucleation radius is fractal. Fractal dimensions are calculated and different fractal dimensions correspond to different boiling surfaces. Fractal dimension is a quantitative parameter describing boiling surface character. |
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| Keywords: | nucleation site density minimum nucleation radius fractal dimension |
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