Nucleation site interaction in pool boiling on the artificial surface
Nucleation site interaction in pool boiling on the artificial surface
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DOI：
10.1016/s0017-9310(02)00291-0
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发表时间：
2003
影响因子：
5.2
通讯作者：
Lei Zhang;M. Shoji
中科院分区：
文献类型：
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作者：
Lei Zhang;M. Shoji
本工作旨在研究池式沸腾中成核位相互作用的物理机制。对不同无量纲腔间距S/Db，即腔间距与气泡平均偏离直径之比，进行了一系列实验，研究了薄硅表面上两个人工腔体的平均气泡偏离频率fd。在综合观察和分析的基础上，找出了影响成核位相互作用的三个重要因素：气泡之间的流体动力相互作用；成核位之间的热相互作用；水平和下降的气泡聚并。这三个因素的强度、竞争和优势关系决定了四个不同的互动区：I区(S/DB>；3)、H区(S/DB⩽3)、H+T区(1.5；S/DB⩽2)和H+T+C区(S/DB⩽1.5)。在“I”区，气泡偏离频率与单腔情况相似，这三个因素的影响都可以忽略不计。对于‘H’区，因子的影响越大，气泡偏离频率越高。在“H+T”区域内，要素与要素之间存在共存与竞争关系。影响气泡偏离频率的主要因素是气泡偏离频率较低。对于“H+T+C”区域，虽然这三个因素都很强且同时竞争，但最终促进作用占主导地位，气泡偏离频率再次增加。通过本文的研究，揭示了池式沸腾中成核位相互作用的一些基本方面，这对于更好地理解沸腾机理具有重要意义。
The present work aims at studying the physical mechanisms of nucleation site interaction in pool boiling. A series of experiments have been carried out to investigate the average bubble departure frequency fdof two artificial cavities on the thin silicon surface for different dimensionless cavity spacing S/ Db, that is the ratio of the cavity spacing to the average bubble departure diameter. Based on the comprehensive observation and analysis, three significant effect factors of nucleation site interaction are found out: hydrodynamic interaction between bubbles; thermal interaction between nucleation sites; horizontal and declining bubble coalescences. The intensity, competition and dominance relations of these three factors determine four different interaction regions: ‘I’ region (S/ Db>3) , ‘H’ region (2<S/ Db⩽3) , ‘H+T’ region (1.5<S/ Db⩽2) and ‘H+T+C’ region (S/ Db⩽1.5) . In the ‘I’ region, the bubble departure frequency is similar to that in the single cavity condition as a result of the negligible effect of all the three factors. For the ‘H’ region, the stronger influence of factor results in a higher bubble departure frequency. Within the ‘H+T’ region, the co-existence and competition relation occurs between factors and . The dominance of factor causes the lower bubble departure frequency. As for the ‘H+T+C’ region, although all the three factors are strong and compete simultaneously, the promotive effect becomes dominant finally and the bubble departure frequency increases again. Through the present study, some essential aspects of the nucleation site interaction in pool boiling have been revealed, which is significant for better understanding the boiling mechanisms.