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SUMMARY:Numerical simulations of multiphase flows with various complexitie
 s - Prof Omar Matar\, Imperial College London
DTSTART:20250606T150000Z
DTEND:20250606T160000Z
UID:TALK231580@talks.cam.ac.uk
CONTACT:Professor Grae Worster
DESCRIPTION:Multiphase flows are of central importance to a wide range of 
 industrial applications and environmental settings. Examples of these incl
 ude mixing in stirred vessels and static mixers\, flows in micro-channels 
 and microfluidics devices\, falling films for CO2 capture\, and aerosol fo
 rmation via bubble bursting through interfaces in the oceans. Some of thes
 e flows feature the presence of surface-active agents (surfactants)\, pres
 ent either by design or as contaminants. Furthermore\, multiphase flows ar
 e often punctuated by topological transitions related to the coalescence o
 f dispersed drops or bubbles\, and the breakup of threads or ligaments. He
 re\, we provide a few examples of interest to the JFM community but focus 
 on drop impact on hydrophobic substrates in the presence of surfactants ab
 ove the critical micelle concentration. Our model accounts for the spatio-
 temporal evolution of the surfactants along the interface and within the b
 ulk\; the bulk and interfacial species are fully-coupled via sorptive flux
 es. Micellar formation and breakup are also accounted for\, and the surfac
 tant dynamics are coupled to the flow through the dependence of the surfac
 e tension on the local interfacial surfactant concentration. Our numerical
  procedure is based on the use of a hybrid interface-tracking/level-set ap
 proach. The results of our parametric study help identify the various phys
 ical mechanisms underlying the observed flow phenomena.
LOCATION:https://cassyni.com/s/fmws
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