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SUMMARY:Phoretic Transport: a challenge for microscopic simulations - Prof
 . Daan Frenkel\, Chemistry Department\, Universtiy of Cambridge
DTSTART:20180427T150000Z
DTEND:20180427T160000Z
UID:TALK87131@talks.cam.ac.uk
CONTACT:Lorenzo Di Michele
DESCRIPTION:Nanotechnology is not just conventional technology scaled down
  to the nano-scale. The reason is that processes that are relatively unimp
 ortant on macroscopic scales may become dominant on the nano-scale. Case i
 n point are phoretic flows: the movement of fluids under the influence of 
 gradients of thermodynamic quantities such as temperature or chemical pote
 ntial. On a macroscopic scale\, the application of a pressure gradient or 
 a body force is the most efficient way to move fluid through a tube. The r
 esulting flux is proportional to the fourth power of the tube diameter. Ho
 wever\, on a sub-micron scale\, phoretic flows tend to become important be
 cause the resulting volumetric flow rates scale as the square of the tube 
 diameter. Hence\, for many problems\, be they technological (e.g. nano-flu
 idics) or natural (e.g. fluid flow through porous networks or gels)\, it i
 s becoming increasingly important to be able to model phoretic flows.\nIt 
 turns out that\, whilst the local continuum description of phoresis is str
 aightforward\, there are real problems with a fully microscopic approach t
 hat is needed in predictive molecular simulations.\nIn my talk\, I will di
 scuss different approach to computing phoretic flows and show what works\,
  and more interestingly\, what fails.
LOCATION:Small Lecture Theatre\, Cavendish Laboratory
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