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Analysis of the Interface Curvature Evolution During Bubble Growth

机译：气泡生长过程中界面曲率演化的分析

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摘要

This study presents an experimental investigation on the local curvature of the bubble interface and its relation to local bubble growth regimes and bubble detachment. An experimental facility has been built in order to produce bubbles by nucleating on a 180-μm-diameter artificial nucleation site on a horizontal copper surface. High-speed videography was used to observe and capture the boiling phenomenon, and an image-processing code has been developed in order to determine the local curvature of the bubble interface through the two main radii of curvature. As the evolution of the curvature at the apex of the bubble reflects the evolution of the vapor pressure inside the bubble, it is shown that inertia plays a negligible role and that bubble growth is dictated by thermal diffusion considerations. The measured curvature profile along the bubble has been compared to the hydrostatic Young-Laplace curvature relation. It is observed that the curvature profile near the base diverges from the theoretical prediction as the bubble forms a neck during its growth. This observation can be related both to the successive stages or regimes of growth and to the mechanism of bubble detachment.
机译：这项研究提出了一个实验研究气泡界面的局部曲率及其与局部气泡生长方式和气泡分离的关系。为了通过在水平铜表面上直径为180μm的人工成核位置上成核而产生气泡，已经建立了实验设备。高速摄影用于观察和捕获沸腾现象，并且已经开发了图像处理代码，以便通过两个主要曲率半径确定气泡界面的局部曲率。由于气泡顶点处的曲率演变反映了气泡内部蒸气压的演变，因此表明惯性起的作用可忽略不计，并且气泡的增长是由热扩散因素决定的。沿气泡测得的曲率轮廓已与静压杨-拉普拉斯曲率关系进行了比较。可以看到，由于气泡在其生长过程中形成了颈部，因此靠近底部的曲率轮廓与理论预测有所不同。该观察结果既可以与生长的连续阶段或方式相关，也可以与气泡脱离的机理相关。

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  • 来源
    《Heat Transfer Engineering》 |2014年第8期|528-536|共9页
  • 作者

    SAMUEL SIEDEL; SERGE CIOULACHTJIAN; SERGIO DI BARI; ANTHONY J. ROBINSON; JOCELYN BONJOUR;

  • 作者单位

    Universite de Lyon, CNRS, INSA-Lyon, CETHIL, UMR5008, F-69621 Villeurbanne, France;

    Universite de Lyon, CNRS, INSA-Lyon, CETHIL, UMR5008, F-69621 Villeurbanne, France;

    Universite de Lyon, CNRS, INSA-Lyon, CETHIL, UMR5008, F-69621 Villeurbanne, France;

    Department of Mechanical and Manufacturing Engineering, Parsons Building, Trinity College, Dublin, Ireland;

    Universite de Lyon, CNRS, INSA-Lyon, CETHIL, UMR5008, F-69621 Villeurbanne, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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