Abstract

In this study, experiments were performed to investigate the flow boiling of deionized water in a rectangle (1 mm × 2 mm) horizontal long mini channel, and visualization experiments were carried out to study the transformations of flow patterns. Uniform heating (UH for short) and step-changing heating (SCH for short) were studied. The local heat transfer coefficients during both heating methods were compared and analyzed. Heat transfer coefficient curves showed same trends, but the slope of local heat transfer coefficient under of SCH was steeper and the occurrence of the dry-out flow would make the local heat transfer coefficient decrease. Besides, six kinds of flow patterns were observed, and an amendment correlation was proposed for a better prediction of heat transfer coefficient.

中文翻译：

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分步加热对水平长小通道水流沸腾影响的实验研究

摘要

在这项研究中，进行了实验以研究去离子水在矩形（1 mm×2 mm）水平长的微型通道中的流动沸腾，并进行了可视化实验以研究流动模式的转变。研究了均匀加热（简称UH）和步进加热（简称SCH）。比较和分析了两种加热方式下的局部传热系数。传热系数曲线显示出相同的趋势，但是在SCH下局部传热系数的斜率更陡，并且出现干流会降低局部传热系数。此外，观察到了六种流型，并提出了修正相关性，以更好地预测传热系数。