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

Abstract : 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˜τ1/3 between the neck width wm and the time τ before breakup indicates that breakup is driven by the inertia of both gas and liquid, not by capillarity.
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https://hal.archives-ouvertes.fr/hal-00674374
Contributor : Dorothée Destouches <>
Submitted on : Monday, February 27, 2012 - 11:20:38 AM
Last modification on : Wednesday, January 13, 2021 - 9:40:33 AM

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Benjamin Dollet, Wim van Hoeve, Jan-Paul Raven, Philippe Marmottant, Michel Versluis. Role of the Channel Geometry on the Bubble Pinch-Off in Flow-Focusing Devices. Physical Review Letters, American Physical Society, 2008, 100 (3), pp.34504. ⟨10.1103/PHYSREVLETT.100.034504⟩. ⟨hal-00674374⟩

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