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SUMMARY:Self-sculpting of a dissolvable body due to gravitational convecti
 on - Megan Davies Wykes (University of Cambridge)
DTSTART:20180607T103000Z
DTEND:20180607T113000Z
UID:TALK104416@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Natural sculpting processes such as erosion or dissolution oft
 en yield universal shapes that bear no imprint or memory of the initial co
 nditions. I will present the results of laboratory experiments aimed at as
 sessing the shape dynamics for the simple case of a dissolvable boundary i
 mmersed in a fluid. Though no external flow is imposed\, dissolution and c
 onsequent density differences lead to buoyancy-driven flows that in turn s
 trongly affect local dissolving rates and shape changes\, and we identify 
 two distinct behaviours. A flat boundary dissolving from its lower surface
  tends to retain its overall shape while developing small-scale roughness 
 that reflects complex near-body flows. A boundary dissolving from its uppe
 r surface tends to erase its initial shape and form an upward spike struct
 ure that sharpens indefinitely. We propose an explanation for these differ
 ent outcomes based on observations of the coupled shape dynamics\, concent
 ration fields\, and flows.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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