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UID:0-1603@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20261021T133000

DTEND;TZID=Asia/Jerusalem:20261021T143000

DTSTAMP:20260721T114554Z

URL:https://aerospace.technion.ac.il/events/seminar-royi-shabtay-21oct2026
 /

SUMMARY:Characterization and Modification of the Flow Field Inside Dynamica
 lly Evolving Bubbles
DESCRIPTION:Lecturer:Royi Shabtay\n Faculty:The Stephen B. Klein Faculty of
  Aerospace Engineering\n Institute:Technion – Israel Institute of Techno
 logy\n Location:Classroom 240\, 1st floor\, Aerospace Eng. building\n Zoom
 : https://technion.zoom.us/j/98372598857\n Abstract: The velocity field in
 side spherical-cap rising bubbles was measured quantitatively by ray-trace
 d\, planar laser-induced fluorescence (PLIF) and shadowgraphy and then use
 d to calculate scalar transport properties for bubbles of different Reynol
 ds numbers. The rising bubbles were seeded with a fluorescent aerosol and 
 their internal velocities fields were educed by optic flow techniques whil
 e correcting for image distortions via a ray-traced reconstruction of the 
 three-dimensional bubble geometries. Physics-based data assimilation was u
 sed to extrapolate missing velocity data near the bubble interface and int
 erpolate the inner velocity field to high resolution\, revealing a multi-s
 cale toroidal vortex structure. The measured velocity fields were used to 
 simulate the scalar transport characteristics across the bubble interfaces
  for the case of rate-limiting\, gas-side resistance. The long-time Sherwo
 od number for these spherical-cap bubbles differed from traditional soluti
 ons for spherical bubbles as a result of their Reynolds number dependent i
 nternal vortex structure. This internal velocity measurement technique has
  important implications for validating scalar transport models of bubbly f
 lows\, as well as enabling quantitative measurement of general\, multi-pha
 se flow scenarios.\n\nThis work is towards an Ph.D. degree under the super
 vision of Associate Professor Ian Jacobi\, The Stephen B. Klein Faculty of
  Aerospace Engineering\, Technion.\n Details: \n 
CATEGORIES:Seminars
LOCATION:Classroom 240\, 1st floor\, Aerospace Eng. building

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