Abstract This work presents an experimental study focusing on the interactions between the dispersed and Taylor bubbles in a slug flow pattern. In order to better investigate these interactions, a quasi-real slug flow was studied, where a single Taylor bubble is injected in a bubbly flow background stream, under controlled and repeatable conditions, controlling the bubbly flow superficial gas and liquid velocity, and also the Taylor bubble length. In this way, ensemble averaged results can be obtained over several Taylor bubbles. The flow was analyzed through the laser diode photocell, high-speed camera imaging and PIV techniques. Results revealed that the terminal Taylor bubble velocity is affected by the gas volume fraction of the bubbly background flow. Ensemble average velocity profiles are presented for Taylor bubble nose and tail regions. Since the experimental apparatus used in the present work allowed a large number of instantaneous PIV acquisitions, the turbulent statistics around the Taylor bubble can also be calculated. These experimental results can be used for the implementation and validation of multidimensional CFD models for flows with different interface length scales.

中文翻译：

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存在分散气泡时泰勒气泡周围流动结构的实验研究

摘要 这项工作提出了一项实验研究，重点是段塞流模式中分散气泡和泰勒气泡之间的相互作用。为了更好地研究这些相互作用，研究了一种准真实的段塞流，在受控和可重复的条件下，将单个泰勒气泡注入气泡流背景流中，控制气泡流表面气体和液体速度，以及泰勒气泡长度。通过这种方式，可以在几个泰勒气泡上获得集成平均结果。通过激光二极管光电池、高速相机成像和 PIV 技术分析了流动。结果表明，终端泰勒气泡速度受气泡背景流的气体体积分数影响。给出了泰勒气泡鼻和尾区域的集合平均速度剖面。由于本工作中使用的实验装置允许大量瞬时 PIV 采集，因此还可以计算泰勒气泡周围的湍流统计数据。这些实验结果可用于不同界面长度尺度流动的多维 CFD 模型的实现和验证。