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High-speed visualization of soap bubble blowing and image-processing-based analysis of pinch-off dynamics

机译:肥皂泡吹气的高速可视化以及基于图像处理的挤压动态分析

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摘要

Soap bubble blowing has long been an amusement for humans, and the process involves pinch-off similarly to liquid drops and gas bubbles. To visualize the pinch-off process of soap bubble blowing, we built an apparatus consisting of air jet flow and thin soap film on a circular ring, and replicated human soap bubbling. High-speed videography captured growing soap film tube and following pinch-off, and the minimal neck radius of the tube was measured based on image processing. Scaling law analyses show that regardless of the ring diameter, the scaling exponent of soap bubble pinch-off is about 2/3, which is similar to that of soap film bridge. Also, the speed of the airflow into the tube was evaluated based on volume calculation of the soap film tube, and the Reynolds number of the airflow was estimated to be 1060-2970, which suggests that soap bubbling may involve Bernoulli suction effect.
机译:长期以来,吹肥皂泡一直是人类的娱乐活动,其过程类似于液滴和气泡。为了可视化肥皂泡吹捏的过程,我们建立了一个由气流和圆环上的肥皂薄膜组成的装置,并复制了人类的肥皂泡。高速摄影术捕获了正在生长的肥皂膜管并被夹断,然后根据图像处理测量了该管的最小颈部半径。缩放定律分析表明,无论环的直径如何,肥皂泡夹断的缩放指数约为2/3,这与肥皂膜桥的缩放指数相似。此外,根据肥皂膜管的体积计算评估了进入管中的气流速度,并且估计气流的雷诺数为1060-2970,这表明肥皂泡可能涉及伯努利抽吸效应。

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