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UID:0-1570@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20260629T133000

DTEND;TZID=Asia/Jerusalem:20260629T143000

DTSTAMP:20260524T091848Z

URL:https://aerospace.technion.ac.il/events/seminar-din-ben-adva-29june202
 6/

SUMMARY:Corner Flow Circulation at Highly Rarefied Conditions and Its Corre
 lation with Mass Transport in Microchannels
DESCRIPTION:Lecturer:Din Ben Adva\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 talk presents two
  recent studies examining the emergence of corner-flow circulation in conf
 ined geometries at highly rarefied conditions\, where the characteristic l
 ength scale is comparable to the molecular mean free path of the gas.\n\nT
 he first study investigates gas flow inside an open triangular cavity subj
 ect to external shear flow in the free- and near-free-molecular flow regim
 es. Analytical solutions of the collisionless Boltzmann equation reveal th
 e anomalous formation of multiple recirculation zones even in the absence 
 of molecular interactions. The analysis demonstrates how vortex topology d
 epends on the corner angle and wall accommodation properties\, establishin
 g a direct connection between microscopic particle kinematics and macrosco
 pic circulation patterns. We additionally discuss ongoing work examining t
 he effect of weak intermolecular interactions at finite yet high Knudsen n
 umbers on the vortical structures. The analytical predictions are validate
 d numerically via the direct simulation Monte Carlo (DSMC) method\, showin
 g excellent agreement.\n\nThe second study considers pressure-driven gas f
 low through a bent microchannel at highly rarefied conditions. The free-mo
 lecular mass flow rate is mapped analytically as a function of the channel
  bent angle and length. Notably\, oscillatory non-monotonic behavior is re
 vealed and rationalized\, associated with vortex formation and flow detach
 ment at the channel corner.\n\nThe seminar will be given by Din Ben Adva t
 he 2026 winner of the Prize in Memory of Prof. Shmuel and Noemi Merhav\n D
 etails: \n 
CATEGORIES:Seminars
LOCATION:Classroom 240\, 1st floor\, Aerospace Eng. building

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