BEGIN:VCALENDAR
PRODID:-//eluceo/ical//2.0/EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VEVENT
UID:3eeeb63f2bc43504e83dae897759a79b
DTSTAMP:20260503T160053Z
SUMMARY:Generation\, dynamics and dissolution of droplets\, bubbles and dou
 ble emulsions in microchannels
DESCRIPTION:Join us for our upcoming Seminar. Discover the latest research 
 in microfluidics aims at exploring the capabilities of lab-on-a-chips\, i.
 e. developing chemical or biological processing at small-scale.\nAbstract\
 nWe present a non-embedded co-flow-focusing device\, called Raydrop\, for 
 single and double-emulsification in microfluidics. Experimental results de
 monstrate the universality of the device in terms of the variety of fluids
  that can be emulsified\, as well as the range of droplet radii that can b
 e obtained\, without neither the need of surfactant nor coating. In a firs
 t part\, a quasi-static model is developed and shows excellent predictive 
 capability for the size of the droplets. Our results also demonstrate that
  the mechanism for the dripping-to-jetting transition in this quasi-static
  limit is intrinsically nonlinear and differs from the absolute-to-convect
 ive transition of the Rayleigh-Plateau instability for a jet. In a second 
 part\, we focus on the dynamics of droplets and bubbles in microchannels\,
  and specifically on their equilibrium position and velocity\, while asses
 sing the influence of their deformability. We then present stability maps 
 for the centred position showing that non-deformable objects dominated by 
 inertial effects are only stable if large enough\, whereas deformable obje
 cts dominated by capillary effects can be stable for much smaller sizes\, 
 except for intermediate viscosity ratios for which deformability also play
 s a destabilizing role\, as for inertia. In a third part\, we investigate 
 mass transfer around bubbles and drops flowing in a cylindrical microchann
 el. We show different concentration patterns and the dependence of the She
 rwood numbers for five different regimes in terms of the Péclet number. W
 e finally show some practical examples of micro-encapsulation with double 
 emulsions.\nBiography\nBenoit Scheid is FNRS Research Director and Profess
 or at the Université Libre de Bruxelles (Belgium)\, where he got his PhD 
 in 2004 on theoretical modelling of hydrodynamic instabilities. In 2005\, 
 he was awarded the Ilya Prigogine Prize for its PhD dissertation on dissip
 ative wave patterns. In 2007\, he got a postdoctoral research position at 
 Harvard University\, where he performed research on glass processing in co
 llaboration with Saint-Gobain Research. He got an academic position in 201
 1 at ULB from the National Foundation for Scientific Research (F.R.S.-FNRS
 ). His research aims at improving the current expertise in interfacial dyn
 amics and surface rheology\, and to make it unique in answering scientific
  and technological questions applying to material processing and microflui
 dics\, with potential impact in material\, pharmaceutical\, chemical\, bio
 logical and medical sciences. Professor Benoit Scheid is also co-founder\,
  executive chairman\, and scientific advisor of the company Secoya Technol
 ogies\, active in production of pharmaceutical compounds.
URL:https://www.imperial.ac.uk/events/178832/generation-dynamics-and-dissol
 ution-of-droplets-bubbles-and-double-emulsions-in-microchannels/
DTSTART;TZID=Europe/London:20240628T150000
DTEND;TZID=Europe/London:20240628T163000
LOCATION:Lecture theatre 306\, Roderic Hill Building\, South Kensington Cam
 pus\, Imperial College London\, London\, SW7 2AZ\, United Kingdom
END:VEVENT
BEGIN:VTIMEZONE
TZID:Europe/London
BEGIN:DAYLIGHT
DTSTART:20240628T150000
TZNAME:BST
TZOFFSETTO:+0100
TZOFFSETFROM:+0100
END:DAYLIGHT
END:VTIMEZONE
END:VCALENDAR