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.
Original language | Undefined |
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Pages (from-to) | 034504-1-034504-4 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 100 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2008 |
Keywords
- IR-59967
- METIS-245577