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SUMMARY:Impacts and fragmentation in liquid-liquid systems: Planet formati
 on in the lab - Maylis Landeau (DAMTP)
DTSTART:20170213T130000Z
DTEND:20170213T140000Z
UID:TALK70502@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:Impact and fragmentation processes in immiscible liquids occur
 red on a massive scale during the accretion of the Earth when high-speed p
 lanetary collisions melted the Earth's mantle\, releasing the metal core o
 f the impacting planetary body in a deep magma ocean. I will present two s
 eries of experiments on (1) the instability and fragmentation of blobs of 
 a heavy liquid released into a lighter immiscible liquid\, and (2) their i
 mpacts with a stratified interface between two immiscible liquids. For suf
 ficiently turbulent conditions\, we find a previously unobserved regime wh
 ere fragmentation into drops occurs as a sudden and single event inside a 
 self-similar vortex ring. I will discuss implications of our scaling laws 
 on turbulent entrainment for geochemical models of Earth formation and str
 atification of the Earth's core.\n\n
LOCATION:MR5\, Centre for Mathematical Sciences
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