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SUMMARY:Instabilities of a liquid film falling down an inclined plane with
  or without a counter-current air flow
DTSTART:20140403T140000
DTSTAMP:20260427T225138Z
UID:131d36e99dd4b13d8a46fea548ac267a42b5e8653a08aa0c5a175585
CATEGORIES:Conferences - Seminars
DESCRIPTION:Nicolas Kofman\, Laboratoire FAST (Université Paris-Sud\, Ors
 ay) - Air Liquide (Les Loges en Josas)\nFalling liquid films in the presen
 ce of a counter-current gas flow constitute the state-of-the-art technical
  solution in distillation columns. Indeed\, the wavy dynamics organized by
  localized structures\, or solitary waves\, is known to enhance the heat a
 nd mass transfer. The optimal operating conditions are generally close to 
 the onset of flooding\, for which a sharp increase in the pressure drop an
 d decrease in the efficiency are observed.\nWithout the gas flow\, the 2D 
 wave regime for moderate Reynolds number is relatively well-understood. It
  is not the same for the 3D evolution of such waves. By using both experim
 ental and numerical tools\, I will explain that several 3D modes exist and
  discuss the related physical mechanisms.\nThen I will show experimentally
  the influence of a counter-current air flow on the waves. Their amplitude
 \, speed and 3D features are found to be strongly affected. The flooding p
 oint is characterized by the emergence of waves going upstream.
LOCATION:BM 5204 
STATUS:CONFIRMED
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