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Study on mechanism of bubble growth within a water droplet under rapid depressurization

机译：快速降压作用下水滴内气泡生长机理的研究

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摘要

Highlights•Bubble growth process within a water droplet under pressure drop was recorded.•Bubble growth induced by mass diffusion is much slower than that by superheating.•Bubble growth experiences initial stage, transition stage and accelerating stage.•Pressure difference, surface tension and friction resistance affect bubble growth.AbstractThis paper reports an experimental and numerical study on mechanism of bubble growth within a water droplet under rapid depressurization. During the experiments, a distilled water droplet was suspended on a thermocouple, which was also used to measure the droplet temperature. A high speed camera was applied to record the bubble expansion. Two mathematical models were developed to describe the bubble growth process. The mass diffusion model considered the bubble growth related to the mass diffusion of nitrogen dissolved in the droplet during pressure drop, and the model was based on the momentum equation of bubble growth coupling with the diffusion equation within the liquid phase. The heat transfer model considered that the droplet superheating resulted in bubble growth. Both of the models considered the influence of thermocouple suspension mode on bubble growth, and a simplified treatment was applied by introducing a friction coefficient. During our experiments, the duration times for bubble growth were mostly 4–8 ms. The verification of mathematical models was achieved by comparing the numerical results with the experimental data. The result shows that the numerical bubble radii calculated by the heat transfer model agree well with the experimental measurement. Through numerical calculations, the factors of pressure difference, droplet diameter and thermocouple suspension mode on bubble growth were analyzed. The results provide insight into the dynamic of bubble growth within a water droplet under rapid depressurization.
机译： 突出显示 • 记录了在压降下水滴在气泡中的生长过程。 • 由质量扩散引起的气泡生长要慢得多 • 气泡增长经历了初始阶段，过渡阶段和加速阶段。 •• 压差，表面张力和摩擦阻力会影响气泡的增长。 摘要 本文报告了在快速减压下水滴内气泡生长机理的实验和数值研究。在实验过程中，将蒸馏水滴悬浮在热电偶上，该热电偶也用于测量水滴温度。应用高速相机记录气泡膨胀。开发了两个数学模型来描述气泡的生长过程。质量扩散模型考虑了气泡生长与压力下降过程中溶解在液滴中的氮的质量扩散有关，该模型基于气泡生长的动量方程与液相内的扩散方程。传热模型认为液滴过热导致气泡增长。这两个模型都考虑了热电偶悬挂模式对气泡生长的影响，并通过引入摩擦系数对其进行了简化处理。在我们的实验中，气泡生长的持续时间大部分为4-8µms。通过将数值结果与实验数据进行比较，对数学模型进行了验证。结果表明，传热模型计算得到的数值气泡半径与实验值吻合良好。通过数值计算，分析了压力差，液滴直径和热电偶悬浮方式对气泡生长的影响。这些结果提供了对快速减压下水滴内气泡生长动态的见解。

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  • 作者

    Lu Liu; Wenjing Ma; Yixin Liu; Jingge Cui;

  • 作者单位

    School of Power, Energy and Mechanical Engineering, North China Electric Power University;

    School of Power, Energy and Mechanical Engineering, North China Electric Power University;

    School of Power, Energy and Mechanical Engineering, North China Electric Power University;

    School of Power, Energy and Mechanical Engineering, North China Electric Power University;

  • 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

    Bubble growth; Droplet; Mass diffusion; Heat transfer; Pressure drop;

    机译：气泡生长;液滴;质量扩散;传热;压降;

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