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Viscous instabilities in flowing foams: A Cellular Potts Model approach

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arxiv cond-mat/0505770 v2 pith:SQM4VOJ6 submitted 2005-05-31 cond-mat.soft

Viscous instabilities in flowing foams: A Cellular Potts Model approach

classification cond-mat.soft
keywords bubblelargevelocitycellularflowflowingfoamfoams
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Cellular Potts Model (CPM) succesfully simulates drainage and shear in foams. Here we use the CPM to investigate instabilities due to the flow of a single large bubble in a dry, monodisperse two-dimensional flowing foam. As in experiments in a Hele-Shaw cell, above a threshold velocity the large bubble moves faster than the mean flow. Our simulations reproduce analytical and experimental predictions for the velocity threshold and the relative velocity of the large bubble, demonstrating the utility of the CPM in foam rheology studies.

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