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首页> 外文期刊>International Journal of Heat and Mass Transfer >The effect of liquid film evaporation on flow boiling heat transfer in a micro tube
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The effect of liquid film evaporation on flow boiling heat transfer in a micro tube

机译：液膜蒸发对微管中流动沸腾传热的影响

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摘要

Flow boiling in micro channels is attracting large attention since it leads to large heat transfer area per unit volume. Generated vapor bubbles in micro channels are elongated due to the restriction of channel wall, and thus slug flow becomes one of the main flow regimes. In slug flow, sequential bubbles are confined by the liquid slugs, and thin liquid film is formed between tube wall and bubble. Liquid film evaporation is one of the main heat transfer mechanisms in micro channels and liquid film thickness is a very important parameter which determines heat transfer coefficient. In the present study, liquid film thickness is measured by laser focus displacement meter under flow boiling condition and compared with the correlation proposed for an adiabatic flow. The relationship between liquid film thickness and heat transfer coefficient is also investigated. Initial liquid film thickness under flow boiling condition can be predicted well by the correlation proposed under adiabatic condition. Under flow boiling condition, liquid film surface fluctuates due to high vapor velocity and shows periodic pattern against time. Frequency of periodic pattern increases with heat flux. At low quality, heat transfer coefficients calculated from measured liquid film thickness show good accordance with heat transfer coefficients obtained directly from wall temperature measurements.
机译：微通道中的流沸腾引起了很大的关注，因为它导致每单位体积的大的传热面积。由于通道壁的限制，微通道中产生的气泡被拉长，因此团状流成为主要的流态之一。在团状流中，连续的气泡被液态团块限制，并且在管壁和气泡之间形成薄的液膜。液膜蒸发是微通道中的主要传热机制之一，液膜厚度是决定传热系数的非常重要的参数。在本研究中，液膜厚度通过激光聚焦位移计在流动沸腾条件下测量，并与绝热流动的相关性进行了比较。还研究了液膜厚度与传热系数之间的关系。通过在绝热条件下提出的相关性，可以很好地预测流动沸腾条件下的初始液膜厚度。在流动沸腾条件下，液膜表面由于高蒸气速度而波动，并显示出随时间变化的周期性图案。周期性图案的频率随热通量增加。在低质量下，根据测量的液膜厚度计算出的传热系数与直接从壁温测量获得的传热系数表现出良好的一致性。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第4期|p.547-555|共9页
  • 作者

    Youngbae Han; Naoki Shikazono; Nobuhide Kasagi;

  • 作者单位

    Institute of Industrial Science, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 151-0041, Japan;

    rnInstitute of Industrial Science, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 151-0041, Japan;

    rnDepartment of Mechanical Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    micro tube; flow boiling; liquid film; evaporation;

    机译：微管流沸腾液膜蒸发;

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