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首页> 外文期刊>International Journal of Heat and Mass Transfer >A study of nucleate boiling heat transfer on hydrophilic, hydrophobic and heterogeneous wetting surfaces
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A study of nucleate boiling heat transfer on hydrophilic, hydrophobic and heterogeneous wetting surfaces

机译：亲水，疏水和非均质润湿表面上核沸腾传热的研究

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The effect of characteristic of heating surface on nucleate boiling heat transfer is well reported via many previous results. However, until recently, the study of surface influences on nucleate boiling was complicated by coupled surface factors; wettability and surface roughness. This study focuses on nucleate pool boiling under different wetting conditions, in the absence of microscale roughness, which is coupled with wetting phenomena. Heterogeneous boiling occurs on hydrophilic (54°) and hydrophobic (123°) surfaces, even without microstructures that can trap water vapor. In the very low heat flux regime, hydrophobic surfaces offer better nucleate boiling heat transfer than hydrophilic surfaces. Moreover, a heterogeneous wettability surface composed of hydrophobic dots on a hydrophilic surface provides better nucleate boiling heat transfer than a homogeneous wettability surface (hydrophilic or hydrophobic). Analysis of bubble generation and departure was carried out via a high-speed visualization technique in order to understand these experimental results. Based on the bubble analysis, it was inferred that changes in wettability could lead to totally different boiling performance when microstructures are absent. Also, the number of hydrophobic dots and the pitch distance between dots were key parameters for explaining boiling performance under heterogeneous wetting conditions.
机译：通过许多先前的结果已经很好地报道了加热表面的特征对成核沸腾传热的影响。然而，直到最近，有关表面因素对成核沸腾影响的研究还由于耦合的表面因素而变得复杂。润湿性和表面粗糙度。这项研究的重点是在不存在微尺度粗糙度的情况下，在不同润湿条件下的成核池沸腾，这与润湿现象有关。异质沸腾发生在亲水性（54°）和疏水性（123°）表面上，即使没有会捕获水蒸气的微结构。在非常低的热通量范围内，疏水性表面比亲水性表面提供更好的成核沸腾传热。此外，由亲水性表面上的疏水性点组成的非均质润湿性表面比均质的润湿性表面（亲水性或疏水性）可提供更好的成核沸腾传热。为了了解这些实验结果，通过高速可视化技术对气泡的产生和离开进行了分析。根据气泡分析，可以推断，当不存在微观结构时，润湿性的变化可能导致完全不同的沸腾性能。而且，疏水点的数量和点之间的间距是用于解释在非均质润湿条件下沸腾性能的关键参数。

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