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首页> 外文会议>International conference on nanochannels, microchannels and minichannels >SCALE EFFECTS ON LIQUID EMISSION PHENOMENA DURING BOILING NUCLEATION IN MINI/MICRO TUBES
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SCALE EFFECTS ON LIQUID EMISSION PHENOMENA DURING BOILING NUCLEATION IN MINI/MICRO TUBES

机译：迷你/微管沸腾成核期间液体排放现象的规模效应

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摘要

A series of experiments was conducted to visually observe the fundamental features of the scale effect on boiling nucleation in mini/micro tubes. Boiling nucleation and/or bubble generation was observed in mini tubes of 1.5 to 2.5 mm and micro tubes of 50 to 200 μm in inner diameter. As heat flux was increased, bubbles were normally observed generating and growing inside the tubes of 2.5 mm. As tube diameter decreased from 1.5 to 0.05 mm, or in mini and micro tubes, the liquid was emitted instantaneously rather than generating bubbles and bubble growth, which is referred as liquid exploding emission in this paper. In mini tubes of D_i=1.5 mm, violent jet flows with macro bubbles were formed, and the liquid was almost totally emitted out of the tube. While in micro tubes of D_i=50-200 μm, the emission was much stronger, and only fog-like jet flow was observed consisted of extremely tiny bubbles, which indicates the mechanism of nucleation is different from that in mini tubes. It is expected that the scale effects intensely influence on not only the onset of emission, but also the strength and nature of emissions.
机译：进行了一系列实验，以便在视觉上观察到迷你/微管中沸腾成核的显着特征的基本特征。在迷你管中观察到沸腾的成核和/或气泡生成，在1.5至2.5mm，70至200μm的微管内直径。随着热通量增加，通常观察到泡沫在2.5mm的管内产生并生长。由于管直径从1.5〜0.05mm降低，或在迷你和微管中，液体瞬间发射而不是产生气泡和泡沫生长，这在本文中被称为液体爆炸发射。在D_I = 1.5mm的微型管中，形成剧烈的喷射，形成宏泡，液体几乎完全排出管。虽然在D_i =50-200μm的微管中，发射得多，但只观察到雾状的喷射流量，由极小微小的气泡组成，这表明核切割机制与迷你管中的机制不同。预计规模效应不仅对排放的发作产生强烈影响，而且产生了排放的力量和性质。

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