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SUMMARY:Reacting plumes and growing icicles: two experiments - Stephen Mor
 ris\, University of Toronto
DTSTART:20110506T150000Z
DTEND:20110506T160000Z
UID:TALK31105@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:I will describe two somewhat unrelated experiments with moving
  fluids.  In the first experiment\, an autocatalytic chemical reaction is 
 used to generate rising plumes in a fluid under gravity.  The reaction fro
 nt is very thin\, something like a flame front\, and the reaction produces
  buoyancy both by releasing heat and by compositional change.  The result 
 is a self-stirred solution in which a small “flame bubble” evolves int
 o a plume with a complex morphology.  I will present both experiments and 
 numerical simulations of the evolution of these plumes and “flame balls
 ”.  They have some resemblance to the initial stages of the deflagration
  of type Ia supernovae.\nThe overall shape and subsequent rippling instabi
 lity of icicles is an interesting free-boundary growth problem. It has bee
 n linked theoretically to similar phenomena in stalactites. We constructed
  a machine to grow icicles and determined their shape and the motion of th
 eir ripples. I will present time-lapse movies of slowly rotating\, growing
  icicles.  Rotation was added to encourage axisymmetry. I will discuss und
 er what conditions the predicted ideal shape emerges and what we have lear
 ned so far about the ripples.
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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