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Bubble Collisions in Microchannels Affected by Hydrodynamic Pressures

机译：受流体动压影响的微通道中的气泡碰撞

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摘要

A microfluidic device was fabricated to study the collision of bubbles with controlled approaching speed of 0.01-10 mm/s. The collision of bubbles resulted in instant coalescence, delayed coalescence and elastic collision as their approaching speeds gradually decreased. This velocity-dependent coalescence is attributed to the variation of the rotation speed of the bubbles under different approaching speeds, which is observed by adhering fluorescent particles on the bubble surfaces. The theoretical predictions illustrate that the rotation of the bubble helps to reduce the hydrodynamic pressures between two approaching bubbles, which accelerates the drainage of the thin liquid film in between and the coalescence.
机译：制造了一种微流体装置来研究气泡的碰撞，受控接近速度为0.01-10 mm / s。气泡的碰撞导致它们的接近速度逐渐降低，从而导致瞬时聚结，延迟聚结和弹性碰撞。这种与速度有关的聚结归因于气泡在不同接近速度下的旋转速度变化，这是通过将荧光颗粒附着在气泡表面上观察到的。理论上的预测表明，气泡的旋转有助于降低两个接近的气泡之间的流体动力压力，从而加速了中间的液膜的排出和合并。

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