Zimmermann, Matthias ; Heinz, Michael ; Sielaff, Axel ; Gambaryan-Roisman, Tatiana ; Stephan, Peter (2019):
Influence of System Pressure on Pool Boiling Regimes on a Microstructured Surface Compared to a Smooth Surface.
In: Experimental Heat Transfer, Taylor & Francis, ISSN 0891-6152,
DOI: 10.1080/08916152.2019.1635228,
[Article]
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 mu m, 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.
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