Critical Heat Flux of Boiling Heat Transfer in a Confined Space
Critical Heat Flux of Boiling Heat Transfer in a Confined Space
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DOI：
10.1299/jsmeb.44.344
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发表时间：
2001-08
期刊：
影响因子：
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通讯作者：
Yaohua Zhao;T. Tsuruta;T. Masuoka
中科院分区：
文献类型：
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作者：
Yaohua Zhao;T. Tsuruta;T. Masuoka
对有限空间中的临界热流密度进行了实验研究和理论分析。密闭空间由两个水平表面组成，下表面加热，上表面有网筛。实验结果表明，网筛上方的蒸汽蘑菇状物的行为与常规池沸腾没有显著差异。当间隙小于某一临界值时，CHF随间隙的减小而减小。理论分析表明，CHF的降低与宏观层的初始厚度随空间间隙的减小而减小，从而使宏观层在蒸汽蘑菇期提前干涸有关。然而，对于足够大的空间，CHF达到由于局部传热的危机，由微层模型，而不是宏层干涸。分析表明，宏观层干涸引起的传热危机（CHF）仅先于微层模型发生，常规宏观层干涸模型是微层模型的特例。CHF的理论预测与实验数据吻合较好。
The critical heat flux (CHF) is studied in a confined space both experimentally and analytically. The confined space is consisted of two horizontal surfaces with the lower surface heated and the upper mesh screen. The observation shows that the behaviors of the vapor mushroom over the mesh screen have not significant differences with that in the conventional pool boiling. However, the CHF reduces with the decrease of the space gap when it is narrower than someone critical value. The theoretical analyses show that the reduced CHF is related to the earlier dryout of macrolayer during the period of vapor mushroom because the initial thickness of the macrolayer reduces with the decrease of the space gap. However, for larger enough space, the CHF is reached due to the crisis of the local heat transfer by the microlayer model but not the macrolayer dryout. Analyses show that the heat transfer crisis (CHF) caused by the macrolayer dryout occurs only in advance of that by the microlayer model and the conventional macrolayer dryout model is a special case of the microlayer model. Theoretic prediction of CHF agrees reasonable well with experimental data.