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SUMMARY:MechE Colloquium: Bubble nucleation and related wettability effect
 s: from fundamentals to durable interfaces
DTSTART:20261110T120000
DTEND:20261110T130000
DTSTAMP:20261016T232330Z
UID:f0c4bc442d1002c4f4f68bbcb2987fd3f381b7c060b9aecc5734ac13
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Matevž Zupančič\, Faculty of Mechanical Engineering\
 , University of Ljubljana\nAbstract: Bubble nucleation on heated surface
 s is strongly governed by the interaction between thermodynamic conditions
 \, surface morphology and wettability. This lecture will revisit the funda
 mentals of heterogeneous nucleation with emphasis on the role of surface c
 avities\, trapped vapour embryos and contact angle in determining whether 
 nucleation can occur and at what wall superheat. Classical nucleation conc
 epts will be used to illustrate why cavity size alone is not sufficient to
  describe an active nucleation site\, and why the geometry of the cavity a
 nd the amount of trapped vapour must be considered together with surface w
 ettability. The discussion will then move toward real surfaces\, where adv
 ancing and receding contact angles\, contact-angle hysteresis\, roughness 
 and different wetting states influence vapour entrapment\, bubble growth\,
  contact-line motion and subsequent rewetting of the surface. Selected exp
 erimental examples from functionalised boiling surfaces will be used to de
 monstrate how controlled combinations of surface chemistry and microstruct
 ure can be applied to tailor nucleation behaviour and overall boiling perf
 ormance. The lecture will conclude with approaches toward more durable boi
 ling interfaces that retain favourable wetting and nucleation characterist
 ics during prolonged operation\, connecting the fundamentals of bubble nuc
 leation with the broader challenge of developing reliable high-performance
  surfaces for practical thermal systems\n\n\nBiography: Matevž Zupanči
 č is an Assistant Professor at the University of Ljubljana\, Faculty of M
 echanical Engineering (UL FME)\, where he teaches undergraduate and gradua
 te courses in heat transfer\, heat exchangers\, process engineering\, ther
 modynamics of mixtures\, and environmentally related technologies. To date
 \, he has co-supervised more than 80 students at the bachelor’s\, master
 ’s\, and PhD levels. He received his PhD from UL FME in 2017 for his res
 earch on the development of advanced surfaces with tailored wettability fo
 r enhanced pool boiling heat transfer. His research encompasses phase-chan
 ge heat transfer\, with particular emphasis on pool boiling\, the long-ter
 m performance of heat transfer surfaces and heat exchangers\, high-resolut
 ion temperature measurement techniques\, surface functionalisation for pha
 se-change applications\, heat transfer under microgravity conditions\, and
  processes related to hydrogen production.
LOCATION:BM 5202 https://plan.epfl.ch/?room==BM%205202 https://epfl.zoom.u
 s/j/61360740951
STATUS:CONFIRMED
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