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The effect of the liquid motion induced by air and vapor bubbles on heat transfer around a cylinder

机译：气泡和气泡引起的液体运动对圆柱体周围传热的影响

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摘要

This paper reports on a study into the effects of bubble-induced motion on heat transfer around a cylinder. Local heat flux due to vapor or air injected bubble motion is measured at different positions around a heated copper cylinder using a hot film technique as well as a heat flux sensor. The first set of experiments, carried out during the first stages of nucleate boiling, showed a dependence of the heat transfer on surface orientation. A similar conclusion was reached in the second set of experiments where the air bubbles were injected using an external source. Average heat flux values computed in the two cases on the upper part of the cylinder were shown to compare relatively well. Finally, the mechanisms involved in the heat transfer enhancement at the same location, on the upper part of the cylinder, in the two sets of experiments are described using a simultaneous analysis of the heat flux time-series and bubble motion.
机译：本文报道了气泡引起的运动对圆柱体周围传热的影响的研究。使用热膜技术和热通量传感器在加热的铜圆柱体周围的不同位置测量由于蒸气或空气注入的气泡运动引起的局部热通量。在成核沸腾的第一阶段进行的第一组实验表明，传热与表面取向有关。在第二组实验中得出了类似的结论，其中使用外部源注入了气泡。两种情况下在圆柱体上部计算出的平均热通量值显示比较好。最后，通过同时分析热通量时间序列和气泡运动，描述了两组实验中气缸上部相同位置的传热增强机制。

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