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首页> 外文期刊>International Journal of Heat and Mass Transfer >Pool boiling CHF on a laser heated thin plate
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Pool boiling CHF on a laser heated thin plate

机译：激光加热薄板上的池沸腾CHF

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摘要

The technique of laser heating a thin metal foil was used to experimentally observe local phenomena in pool boiling CHF on a small flat surface. The experiments were performed with saturated water boiling on 25 μm thick copper and titanium foils with heating surface diameters ranging from 2.27 to 9 mm. The number of simultaneously active nucleation sites depends on the heat flux and the size and material of the laser heated surface. A reduction in the heating surface diameter D_H moves the transition between one and several simultaneously active nucleation sites towards higher heat fluxes. CHF for small heating surfaces is lower than that for entirely heated surfaces. The variation of the ratio of bubble/vapour mass diameter to the heating surface diameter. D_B/D_H, with D_H is similar to the variation of CHF with D_H CHF is significantly influenced by the number of simultaneously active nucleation sites. The influence of heating of the surrounding surface on decreasing DH, which was observed using two laser beams with different diameters was more intense at higher D_H on Cu foil than on Ti foil.
机译：激光加热薄金属箔的技术被用于实验观察在小的平面上的池沸腾CHF中的局部现象。实验是在加热表面直径为2.27至9 mm的25μm厚的铜箔和钛箔上用饱和水沸腾进行的。同时活跃的成核位点的数量取决于热通量以及激光加热表面的大小和材料。加热表面直径D_H的减小使一个和几个同时激活的成核位置之间的过渡朝着更高的热通量移动。小加热表面的CHF低于完全加热表面的CHF。气泡/蒸气质量直径与加热表面直径之比的变化。 D_B / D_H和D_H相似，CHF随D_H的变化CHF受同时活动的成核位点数量的影响很大。使用不同直径的两个激光束观察到，周围表面加热对DH降低的影响在较高的D_H下在Cu箔上比在Ti箔上更强烈。

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