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首页> 外文期刊>International Journal of Heat Exchangers >The Wetted Area Fraction of Dropwise Condensation with Inert Gases and Drop Drainage
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The Wetted Area Fraction of Dropwise Condensation with Inert Gases and Drop Drainage

机译：惰性气体滴落冷凝水的湿润面积分数和液滴排放

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摘要

The main two differences between filmwise and dropwise condensation, viz. condensate topology and heat transfer performance, and their relationship are investigated. A new method to determine the wetted area fraction is presented. It is based on local, instantaneous temperatures measured with infrared thermography, and on validated averaging procedures. With two independent methods, the wetted area fraction of a polymer plate condenser has been measured for gas mixtures of moist air with various concentrations of ethanol. A fraction of about 55% is found, with no systematic dependence on any inlet parameter if the inlet mass fraction of steam exceeds 0.1. The drainage of the condensate off the cooled plates, by gravity and shear, hardly or not affects the wetted area fraction. This result is interpreted with the aid of measurements of drop size distributions.
机译：薄膜冷凝和逐滴冷凝之间的主要两个区别，即。研究了冷凝水拓扑结构和传热性能，以及它们之间的关系。提出了确定润湿面积分数的新方法。它基于用红外热像仪测量的局部瞬时温度以及经过验证的平均程序。用两种独立的方法，已经测量了聚合物板冷凝器的湿面积分数，以了解湿空气与各种浓度乙醇的气体混合物。如果蒸汽的入口质量分数超过0.1，则会发现约有55％的分数，而与系统的任何入口参数无关。冷凝物通过重力和剪切力从冷却的板中排出几乎不影响润湿面积分数。该结果借助于液滴尺寸分布的测量来解释。

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