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SUMMARY:Capturing gas in soft granular media - Sungyon Lee (University of 
 Minnesota)
DTSTART:20170918T111000Z
DTEND:20170918T113000Z
UID:TALK80381@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Bubble   migration through a soft granular material involves a
  strong coupling between   the bubble dynamics and the deformation of the 
 material. This is relevant to   a variety of natural processes such as gas
  venting from sediments and gas   exsolution from magma. Here\, we study t
 his process experimentally by   injecting air into a quasi-2D packing of s
 oft hydrogel beads and measuring   the morphology of the bubbles as they r
 ise due to buoyancy. We systematically   modulate the overall elasticity o
 f the packing by confining it to different   degrees with a rigid but flui
 d-permeable upper boundary. We find that this   new combination of buoyanc
 y\, capillarity\, and elasticity under confinement   leads to complex morp
 hologies of air migration\, as well as nontrivial   dynamics in the amount
  of trapped air in the system. Surprisingly\, more   confined packings are
  able to capture larger volumes of air\, with a sharp   transition between
  the so-called &ldquo\;small&rdquo\; and &ldquo\;large&rdquo\; air-capture
  regimes.   This result alludes to the possibility of utilizing soft parti
 cles to enable   control of the gas migration in practical applications\, 
 such as carbon   capture and storage.&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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