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首页> 外文期刊>International Journal of Heat and Mass Transfer >Interfacial heat transfer of condensing bubble in subcooled boiling flow at low pressure
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Interfacial heat transfer of condensing bubble in subcooled boiling flow at low pressure

机译：低压过冷沸腾流中冷凝气泡的界面传热

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摘要

The interfacial heat transfer coefficient is an important parameter for the analysis of multi-phase flow. In subcooled boiling flow, bubbles condense through the interface of phases and the interfacial heat transfer determines the condensation rate which affects the two-phase parameters such as void fraction and local liquid temperature. Thus, the present experiments are conducted to correlate the interfacial heat transfer coefficient at low pressure in the subcooled boiling flow. The local liquid temperature is measured by microthermocouple and the bubble condensation rate is estimated by orthogonal, two-image processing. The condensate Nusselt number, which is a function of bubble Reynolds number, local liquid Prandtl number, and local Jacob number, is obtained from the experimental results. The bubble history is derived from the newly proposed correlation and the condensate Nusselt number is compared with the previous models.
机译：界面传热系数是分析多相流的重要参数。在过冷沸腾流中，气泡通过相的界面冷凝，界面传热决定了凝结率，凝结率影响两相参数，例如空隙率和局部液体温度。因此，进行本实验以使过冷沸腾流中的低压下的界面传热系数相关。通过微热电偶测量局部液体温度，并通过正交的两个图像处理估算气泡的凝结率。从实验结果中得出冷凝物努塞尔数，该数值是气泡雷诺数，局部液体普朗特数和局部雅各布数的函数。气泡历史是从新提出的相关性中得出的，冷凝物的努塞尔数与以前的模型进行了比较。

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