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SUMMARY:Slippery flows in nature and industry - Katarzyna Kowal\, Universi
 ty of Glasgow
DTSTART:20240223T160000Z
DTEND:20240223T170000Z
UID:TALK210421@talks.cam.ac.uk
CONTACT:Professor Grae Worster
DESCRIPTION:In various settings in nature and industry\, certain types of 
 substrates promote increased fluid flow through sliding. Large-scale examp
 les include the flow of ice sheets\, such as that of Greenland and Antarct
 ica\, over bedrock lubricated by a layer of subglacial till. Small-scale e
 xamples include the lotus leaf and fabricated hydrophobic surfaces\, which
  are of use for various industrial applications\, from microfluidics and f
 low delivery in the pharmaceutical and biotechnology industries\, to drag 
 reduction applications in the aeronautics and maritime industries\, for ex
 ample. What makes these types of surfaces slippery is their microstructure
 \, which cushions the flow from below\, promoting slip. However\, it remai
 ns a challenge to design substrates that are slippery enough for appreciab
 le sliding to be seen for certain types of flows - particularly large-scal
 e viscous flows. This talk goes through the development of a theoretical a
 nd experimental framework for generating slip underneath viscous fluids on
  the large scale while minimising the effects of unwanted fluid-mechanical
  instabilities. We build into this framework the freedom to adjust slip\, 
 as desired\, and capture it by a macroscopic sliding law. We also demonstr
 ate examples of environmental and industrial phenomena\, and related exper
 iments\, where such basal sliding is important.
LOCATION:MR2
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