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SUMMARY:Dispersion in jets\, decontamination processes at surfaces and nat
 ural ventilation
DTSTART:20140325T161500
DTEND:20140325T171500
DTSTAMP:20260413T152936Z
UID:a2b686f21386a0b654017e73f8af8dbf967192774c08fe51734f734e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Julien Landel\, University of Cambridge\, UK\nBio: Julien L
 andel is a Post-Doctoral Research Associate in the Department of Applied M
 athematics and Theoretical Physics (DAMTP) and Junior Research Fellow of M
 agdalene College at the University of Cambridge. In 2009 he received a M.S
 ci. from École Polytechnique (Paris)\, where he had received the First Re
 search Prize in Mechanics for his experimental study on the dynamics of la
 rge air bubbles rising in water. The same year\, he also received a M.Eng.
  from the National University of Singapore. He received a Ph.D. in Applied
  Mathematics from Churchill College at the University of Cambridge in 2012
 . As a PhD student\, he studied the transport\, dispersion and mixing prop
 erties of confined turbulent jets\, under the supervision of Colm Caulfiel
 d and Andy Woods. He was Finalist of the Osborne Reynolds Research Student
  Award in the UK for his dissertation in fluid dynamics. In 2012\, he star
 ted his post-doctoral research under the supervision of Stuart Dalziel at 
 DAMTP to study the fluid mechanics of decontamination processes. In 2013\,
  he was awarded a three-year Thomas Nevile Research Fellowship by Magdalen
 e College\, Cambridge\, for his post- doctoral research.\nAbstract : In th
 e first part of the talk\, I will present one of my ongoing research inter
 ests on the dispersion and mixing\nin confined turbulent jets. This resear
 ch is relevant to chemical reactors\, the coking process in oil refinement
 \, as well as pollution in shallow rivers flowing into lakes or oceans. Co
 nfined jets display a fascinating\nstructure with a high-speed meandering 
 core and large counter-rotating eddies. I model the impact of the core\nan
 d the eddies on the transport and dispersion of tracers using an advection
 -diffusion model. The time- dependent analytical solution is in good agree
 ment with experimental results and reveals that a significant quantity of 
 passive tracers can be transported faster than the advection speed predict
 ed using a top-hat velocity profile in the jet.\nIn the second part of the
  talk\, I will discuss my current post-doctoral research on the fluid mech
 anics of decontamination processes. The applications range from the effici
 ent decontamination of hazardous materials\nduring chemical warfare\, to r
 educing water and energy consumption for dishwashers. The fundamental\nmec
 hanisms involved in decontamination can be modelled as advection\, diffusi
 on and reaction processes. I\nwill discuss their impact on the optimizatio
 n of the decontamination process in the light of my experimental results.\
 nFinally\, I will describe my future research plans. I intend to investiga
 te the influence of thermal mass and smart innovative materials\, such as 
 phase-change materials\, on the ventilation of buildings. The impact of th
 ermal mass has often been overlooked in models for natural ventilation. Th
 ere is major potential benefit\nfrom using thermal mass\, such as reducing
  daily temperature fluctuations and storing excess thermal energy. Designi
 ng new low-energy buildings using natural ventilation as well as adapting 
 existing buildings\nrepresents a formidable engineering challenge\, and th
 ere is a pressing need to understand and model the underlying physics.
LOCATION:ME B1 10 http://plan.epfl.ch/?room=MEB110
STATUS:CONFIRMED
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