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首页> 外文会议>6th international conference on nanochannels, microchannels and minichannels 2008 >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：微型/微型管沸腾成核过程中液体排放现象的尺度效应

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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，目视观察了微型/微型管中水垢成核作用的基本特征。在1.5至2.5mm的微型管和内径为50至200μm的微型管中观察到沸腾成核和/或气泡的产生。随着热通量的增加，通常会观察到气泡在2.5毫米的管内产生并生长。当管子的直径从1.5毫米减小到0.05毫米时，或者在微型和微型管子中，液体是瞬时喷出的，而不是产生气泡和气泡增长，在本文中称为液体爆炸发射。在D_i = 1.5 mm的微型管中，形成带有大气泡的剧烈喷射流，液体几乎全部从管中喷出。在D_i = 50-200μm的微型管中，发射要强得多，仅观察到雾状喷射流由极小的气泡组成，这表明成核机理与微型管中的成核机理不同。预期规模效应不仅会严重影响排放的开始，而且会严重影响排放的强度和性质。

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  • 来源
  • 会议地点 Darmstadt(DE);Darmstadt(DE)
  • 作者

    D. Wu; X. F. Peng;

  • 作者单位

    Laboratory of Phase Change and Interfacial Transport Phenomena, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

    Laboratory of Phase Change and Interfacial Transport Phenomena, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;

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