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PRODID:-//Memento EPFL//
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SUMMARY:Frost propagation on breath figures
DTSTART:20241113T140000
DTEND:20241113T150000
DTSTAMP:20260523T154820Z
UID:1fc94ab7a9916f6932444cc6a2a677c82c6e085cbbedeae87e009a14
CATEGORIES:Conferences - Seminars
DESCRIPTION:David Paulovics\nAbstract :\nThe formation of frost on surface
 s is ubiquitous in cold and humid environments. The various mechanisms tha
 t take place during frost formation are still under active scrutiny\, both
  from a fundamental point of view and for their applications to frost cont
 rol.\n\nBreath figures form by dropwise condensation on surfaces colder th
 an the dew temperature. Frost propagates through breath figures by means o
 f the solidification of droplets and the formation of inter-droplet ice br
 idges. We take a novel experimental approach using infrared microscopy to 
 follow the propagation of the frosted area. Starting from a first nucleati
 on event\, a frost front propagates radially at a constant speed for a giv
 en experiment. The droplet size distribution was varied systematically and
  we found that the front speed is a non-monotonous function of droplet siz
 e with a maximum speed of 70 micrometer per second\, for a characteristic 
 drop radius of 300 micrometers.\n\nThe dynamics are governed by three time
 scales: the freezing time of individual droplets\, their cooling time\, an
 d the inter-droplet bridge formation time. We present a mean-field model t
 hat without any free parameters is in very good agreement with both experi
 mental and numerical data.
LOCATION:ME B1 B10 https://plan.epfl.ch/?room==ME%20B1%20B10
STATUS:CONFIRMED
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