Frictional fluid dynamics and viscously stable pattern formation

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• Bjornar Sandnes, Swansea University
• Friday 16 June 2023, 16:00-17:00
• MR2.

If you have a question about this talk, please contact Prof. Jerome Neufeld.

Injection of a low viscosity fluid into a high viscosity fluid produces viscous fingering. The reverse scenario (high viscosity invading fluid) produces compact, viscously stabilised flow – just an expanding disc in a radial Hele-Shal cell. But what happens if we inject a high viscosity fluid into a bed of grains submerged in a low viscosity fluid? We inject water/glycerol into hydrophobic grains “submerged” in air. The bulldozing frictional instability generates fingers through which a viscous liquid flows. The viscous pressure gradient depends on injection rate and fluid viscosity, and we shall see how increasing either produces increased viscous stabilisation of the frictional fingering pattern, taking us through a transition from a single active finger, to multiple fingers, and finally to a fully compact “spoke” pattern.

This talk is part of the Fluid Mechanics (DAMTP) series.

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