Contraction of a shear-thinning axisymmetric cavity

We investigate the capillary driven collapse of a small contracting cavity or hole in a shear-thinning fluid. We find that shear-thinning effects accelerate the collapse of the cavity by decreasing the apparent liquid viscosity near the cavity’s moving front. Scaling arguments are used to derive a p...

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Bibliographic Details
Published in:Physics of fluids (1994) 2019-12, Vol.31 (12)
Main Authors: Lu, Jiakai, Ferri, Michele, Ubal, Sebastian, Campanella, Osvaldo, Corvalan, Carlos M.
Format: Article
Language:English
Subjects:
Biosensors
Collapse
Fluid dynamics
Food processing industry
Physics
Porosity
Shear
Shear thinning (liquids)
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Summary:We investigate the capillary driven collapse of a small contracting cavity or hole in a shear-thinning fluid. We find that shear-thinning effects accelerate the collapse of the cavity by decreasing the apparent liquid viscosity near the cavity’s moving front. Scaling arguments are used to derive a power-law relationship between the size of the cavity and the rate of collapse. The scaling predictions are then corroborated and fully characterized using high-fidelity simulations. The new findings have implications for natural and technological systems including neck collapse during microbubble pinch-off, the integrity of perforated films and biological membranes, the stability of bubbles and foams in the food industry, and the fabrication of nanopore based biosensors.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.5126475