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Role of the Channel Geometry on the Bubble Pinch-Off in Flow-Focusing Devices

机译:通道几何形状在流量聚焦设备中气泡收缩中的作用

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摘要

The formation of bubbles by flow focusing of a gas and a liquid in a rectangular channel is shown to depend strongly on the channel aspect ratio. Bubble breakup consists in a slow linear 2D collapse of the gas thread, ending in a fast 3D pinch-off. The 2D collapse is predicted to be stable against perturbations of the gas-liquid interface, whereas the 3D pinch-off is unstable, causing bubble polydispersity. During 3D pinch-off, a scaling wm~tau1/3 between the neck width wm and the time tau before breakup indicates that breakup is driven by the inertia of both gas and liquid, not by capillarity.
机译:在矩形通道中通过气体和液体的流动聚焦形成的气泡显示出强烈取决于通道的纵横比。气泡破裂的原因在于,气体线缓慢地线性2D塌陷,最终以快速3D夹断而告终。预计2D塌陷对气液界面的扰动是稳定的,而3D夹断则不稳定,从而导致气泡多分散性。在3D压缩期间,颈部宽度wm和破裂前的时间tau之间的比例wm〜tau1 / 3表示破裂是由气体和液体的惯性驱动的,而不是由毛细管现象驱动的。

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