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

Dollet, Benjamin and Hoeve van, Wim and Raven, Jan-Paul and Marmottant, Philippe and Versluis, Michel (2008) Role of the Channel Geometry on the Bubble Pinch-Off in Flow-Focusing Devices. Physical Review Letters, 100 (3). 034504. ISSN 0031-9007

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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~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.
Item Type:	Article
Copyright:	© 2008 American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Physics of Fluids (POF)
Link to this item:	http://purl.utwente.nl/publications/59967
Official URL:	http://dx.doi.org/10.1103/PhysRevLett.100.034504
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