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UID:0-422@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20171108T163000

DTEND;TZID=Asia/Jerusalem:20171108T173000

DTSTAMP:20230530T180642Z

URL:https://aerospace.technion.ac.il/events/customized-droplet-density-in-
 double-emulsions/

SUMMARY:Customized Droplet Density in Double Emulsions
DESCRIPTION:Lecturer:Shaik Subhani\n Faculty:Department of Aerospace Engine
 ering\n Institute:Technion – Israel Institute of Technology\n Location:C
 lassroom 165\, ground floor\, Library\, Aerospace Eng.\n Zoom: \n Abstract
 : \n Details: \n The generation of monodisperse tracer particles is a cruc
 ial element of particle image velocimetry (PIV) flow measurements\, but mo
 st commercially available particles are expensive to purchase\, difficult 
 to manufacture in-house\, or fail to provide the neutral or near-neutral b
 uoyancy needed to obtain unbiased velocity measurements. In this study\, w
 e seek to generate custom PIV particles by a double-emulsion method\, in w
 hich the density and light-reflecting or light-emitting properties of the 
 tracer droplets can be modified with relative ease and the monodispersity 
 of the droplets can be controlled. The double emulsion droplets are genera
 ted by a co-flow microfluidic device. The micro-capillary device consists 
 of cylindrical glass capillaries nested inside a square capillary.  This 
 involves a single step generation of double emulsions with precise control
  over size of the droplets.\nThe formation of double emulsion droplets is 
 via two mechanisms i.e\, dripping and jetting. In the dripping regime\, th
 e droplet forms close to the entrance of the collector capillary whereas i
 n the jetting regime the inner and the middle fluid form a co-axial jet wh
 ich extends two and more capillary diameters and breaks into a chain of do
 uble emulsion droplets. The flow rates and fluid properties of the droplet
  manufacturing process were optimized and the effect of density modificati
 on by salt addition was studied.  The double emulsion droplets are polyme
 rized using photo-polymerization techniques. Finally\, the droplets were u
 sed in preliminary PIV measurements.
CATEGORIES:Seminars
LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng.

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