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Two-Phase Structure Underneath a Water Jet Impinging on a Hot Surface

机译:射水撞击热表面下的两相结构

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Jet impingement boiling is a very efficient method for achieving high rates of heat removal. Despite the widespread usage in industry the basic heat transfer mechanisms are not well understood. The objective of this study is therefore to gain a better knowledge of the boiling mechanisms in the stagnation line of a subcooled impinging water jet through investigations of the prevailing two-phase structure. For this purpose, a miniaturized optical probe was applied. Measurements were carried out under steady-state conditions at different surface superheats along the entire boiling curve by means of a temperature-controlled test heater. The investigations provide crucial information on the local void fraction and vapor/liquid contact times and frequencies of the two-phase structure as a function of the distance to the surface. This data is necessitated for the development of a mechanistic model.
机译:射流冲击沸腾是实现高排热速率的非常有效的方法。尽管在工业中得到广泛使用,但基本的传热机制还没有被很好地理解。因此,本研究的目的是通过研究主要的两相结构,更好地了解过冷撞击式水射流停滞管线中的沸腾机理。为此目的,应用了小型化的光学探针。借助于温度控制的测试加热器,在稳态条件下,沿着整个沸腾曲线在不同的表面过热度下进行测量。研究提供了有关局部空隙率,气/液接触时间以及两相结构频率与表面距离的函数关系的重要信息。此数据对于机械模型的开发是必需的。

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