ABSTRACT This study focuses on the influence of the system pressure on pool boiling regimes on a microstructured surface compared to a smooth surface. The microstructured surface consists of copper wires with diameters and lengths of 1 and 20 µm, respectively. The saturation pressure of FC-72 is varied between 0.5 and 1.8 bar. Boiling curves are determined and compared to those of a smooth copper surface. The results with the microstructured surface show no distinctive pressure dependency, contrary to those with a smooth surface being in good agreement with a state-of-the-art correlation. The microstructured surface exhibits higher heat transfer coefficients and lower critical heat fluxes than the smooth surface. The Nukiyama-curves of the microstructured and the smooth surface suggest the existence of distinctive sub-regimes of the isolated bubble regime: the partially activated isolated bubble regime and the fully activated isolated bubble regime.

中文翻译：

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与光滑表面相比，微结构表面上系统压力对水池沸腾状态的影响

摘要 本研究的重点是与光滑表面相比，系统压力对微结构表面上的池沸腾状态的影响。微结构表面由直径和长度分别为 1 和 20 微米的铜线组成。FC-72 的饱和压力在 0.5 到 1.8 bar 之间变化。确定沸腾曲线并与光滑铜表面的曲线进行比较。微结构表面的结果没有显示出明显的压力依赖性，这与光滑表面的结果与最先进的相关性非常吻合。与光滑表面相比，微结构表面具有更高的传热系数和更低的临界热通量。