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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Nucleate Pool Boiling on Copper-Graphite Composite Surfaces and Its Enhancement Mechanism
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Nucleate Pool Boiling on Copper-Graphite Composite Surfaces and Its Enhancement Mechanism

机译：铜-石墨复合材料表面成核池沸腾及其增强机理

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摘要

An experimental study is performed on nucleate pool boiling in a highly wetting liquid, Freon-113, and a moderately wetting liquid, water, on copper-graphite (Cu-Gr) composite surfaces under atmospheric conditions. Boiling heat-flux data on the Cu-Gr surfaces are compared with those on a pure copper surface. Best-fit correlation equations are derived to relate the boiling heat flux to wall superheat and boiling heat-transfer coefficient with the heat flux for each liquid-solid combination. It is disclosed that the nucleate boiling heat transfer in both test liquids is augmented by the presence of graphite fibers and that the composite surface with 25% volume fraction of graphite fibers in the copper matrix exhibited the best enhancing performance in both test liquids. Water is characterized by a stronger enhancement and less degeneracy of the enhancement with an increase in the heat flux than Freon-113. The enhancement mechanism is proposed using a bubble departure model developed by the authors.
机译：在大气条件下，对铜-石墨（Cu-Gr）复合表面上的高润湿性液体Freon-113和中度润湿性液体水中的成核池沸腾进行了实验研究。将Cu-Gr表面的沸腾热通量数据与纯铜表面的沸腾热通量数据进行比较。推导最佳拟合相关方程，将沸腾热通量与壁过热和沸腾热传递系数与每种液固组合的热通量相​​关联。公开了两种测试液体中的核沸腾传热由于石墨纤维的存在而增加，并且在铜基体中具有25％体积分数的石墨纤维的复合表面在两种测试液体中均表现出最佳的增强性能。水的特征是与氟利昂113相比，随着热通量的增加，增强作用更强，退化程度更小。使用作者开发的气泡偏离模型来提出增强机制。

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