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SUMMARY:Ice melting in salty water: layering and non-monotonic dependence 
 on the mean salinity - Detlef Lohse (Universiteit Twente)
DTSTART:20240117T111500Z
DTEND:20240117T120000Z
UID:TALK208489@talks.cam.ac.uk
DESCRIPTION:The presence of salt in ocean water strongly affects the melt 
 rate and the shape evolution of ice\, both of utmost relevance in geophysi
 cal and ocean flow and thus for the climate. To get a better quantitative 
 understanding of the physical mechanics at play in ice melting in salty wa
 ter\, we numerically investigate the lateral melting of an ice block in st
 ably stratified saline water\, using a realistic\, nonlinear equation of s
 tate. The developing ice shape from our numerical results shows good agree
 ment with the famous experiments and theory from Huppert & Turner from the
 ir JFM in 1980. Furthermore\, we find that the melt rate of ice depends no
 n-monotonically on the mean ambient salinity: It first decreases for incre
 asing salt concentration until a local minimum is attained\, and then incr
 eases again. This non-monotonic behavior of the ice melt rate is due to th
 e competition among salinity-driven buoyancy\, temperature-driven buoyancy
 \, and salinity-induced stratification. We develop a theoretical model bas
 ed on the energy balance which gives a prediction of the salt concentratio
 n for which the melt rate is minimal\, and is consistent with our data. Ou
 r findings give insight into the interplay between phase transitions and d
 ouble-diffusive convective flows. The talk will also elaborate on other me
 lting phenomena.
LOCATION:Seminar Room 1\, Newton Institute
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