BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Frictional fluid dynamics and viscously stable pattern formation -
  Bjornar Sandnes\, Swansea University
DTSTART:20230616T150000Z
DTEND:20230616T160000Z
UID:TALK200767@talks.cam.ac.uk
CONTACT:Prof. Jerome Neufeld
DESCRIPTION: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 vis
 cosity fluid into a bed of grains submerged in a low viscosity fluid? We i
 nject water/glycerol into hydrophobic grains “submerged” in air. The b
 ulldozing 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 increas
 ed viscous stabilisation of the frictional fingering pattern\, taking us t
 hrough a transition from a single active finger\, to multiple fingers\, an
 d finally to a fully compact “spoke” pattern.
LOCATION:MR2
END:VEVENT
END:VCALENDAR