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DTSTART:19700329T010000
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CATEGORIES:Quantitative Climate and Environmental Science Sem
 inars
SUMMARY:Viscoplastic Droplets - Maziyar Jalaal\, DAMTP
DTSTART;TZID=Europe/London:20191111T130000
DTEND;TZID=Europe/London:20191111T140000
UID:TALK133045AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/133045
DESCRIPTION:Viscoplastic or yield stress materials can behave 
 like solids or fluids. Such materials\, if not suf
 ficiently stressed\, behave like an elastic solid\
 , but once the stress exceeds a critical value (th
 e yield stress)\, the material deforms like a visc
 ous fluid (typically with a nonlinear viscosity).\
 n\nWe will discuss the effect of the yield stress 
 on spreading droplets. We use experiments\, asympt
 otic solutions\, and numerical simulations to expl
 ain the dynamics and final shape of the droplets. 
 Later\, we will show how one can externally contro
 l the shape of a spreading droplet\, using tempera
 ture. For that\, we will first present the rheolog
 ical properties of a thermo-responsive material th
 at undergoes sol(Newtonian)-gel(yield stress) tran
 sition upon heating.  Then\, we show the final dia
 meter of a thermo-responsive droplet can be contro
 lled by simply changing the surface temperature. I
 n the same part\, we introduce an experimental met
 hod based on optical coherence tomography to ident
 ify the solidified region inside a droplet.\n\nEve
 ntually\, we will briefly discuss the other applic
 ations of viscoplastic droplets.
LOCATION:MR5\, Centre for Mathematical Sciences
CONTACT:Prof. Jerome Neufeld
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