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SUMMARY:Channel-forming instabilities in poroelastic media under pressure-
 driven flow - Joe Webber (Univ. Warwick)
DTSTART:20260225T130000Z
DTEND:20260225T140000Z
UID:TALK242986@talks.cam.ac.uk
CONTACT:Emma
DESCRIPTION:A vast array of processes in geophysics (compaction of sedimen
 tary basins)\, industry (paper manufacture and coffee extraction) and even
  the human body (transport of materials through the digestive system) invo
 lve the compaction of porous\, elastic\, layers by a pressure-driven flow.
  The nature of this compaction has been studied in depth (see\, for exampl
 e\, Hewitt et al. Phys Rev. E. 93:023116 (2016))\, including the dependenc
 e of the flow rate on the pressure head and the amount of elastic deformat
 ion this induces\, but the stability of these compacted profiles has not b
 een investigated as thoroughly. In this talk\, I'll outline some work in p
 rogress (...that I promised Duncan would be ready by sometime in March 202
 4) towards this goal\, showing how a compacted hydrogel layer is\, under c
 ertain circumstances\, unstable to channel formation\, and how the stabili
 ty properties depend on the permeability and pressure head\, as would be e
 xpected\, but also on the proportion of 'bound water' in the gel scaffold 
 and the shear stiffness (in a potentially unexpected way).
LOCATION:MR12
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