Frictional fluid instabilities shaped by viscous forces

Dawang Zhang, James M. Campbell, Jon A. Eriksen, Eirik G. Flekkøy, Knut Jørgen Måløy, Christopher W. MacMinn and Bjørnar Sandnes ()
Additional contact information
Dawang Zhang: Swansea University
James M. Campbell: Swansea University
Jon A. Eriksen: University of Oslo
Eirik G. Flekkøy: University of Oslo
Knut Jørgen Måløy: University of Oslo
Christopher W. MacMinn: University of Oxford
Bjørnar Sandnes: Swansea University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Multiphase flows involving granular materials are complex and prone to pattern formation caused by competing mechanical and hydrodynamic interactions. Here we study the interplay between granular bulldozing and the stabilising effect of viscous pressure gradients in the invading fluid. Injection of aqueous solutions into layers of dry, hydrophobic grains represent a viscously stable scenario where we observe a transition from growth of a single frictional finger to simultaneous growth of multiple fingers as viscous forces are increased. The pattern is made more compact by the internal viscous pressure gradient, ultimately resulting in a fully stabilised front of frictional fingers advancing as a radial spoke pattern.

Date: 2023
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DOI: 10.1038/s41467-023-38648-6

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