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DTSTAMP:20260416T115304
DTSTART:20130606T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/184637
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Molecular acoustics: theory and applications 
DESCRIPTION:Andi Petculescu\, Department of Physics\, University of Louisi
 ana at Lafayette\, Lafayette\, LA 70504-4210\, USAMolecular acoustics stud
 ies the effects of molecular relaxation on sound propagation in fluids. Th
 e field was effectively started by Lev Landau and Edward Teller in 1936 in
  a paper describing the relationship between intermolecular energy transfe
 r and intrinsic absorption and dispersion of sound\, via relaxational proc
 esses.In this presentation I will review the basics of molecular acoustics
  and present a first-principles model predicting the complex acoustic wave
 number in polyatomic gases. Then I will discuss applications in two fields
 : quantitative sonic gas analysis and sound propagation in planetary atmos
 pheres. It has long been a ``mantra'' of acoustic gas sensing that one can
  only use acoustic methods to measure the mean molecular weight of a gas m
 ixture. We have shown that\, if one measures the acoustic absorption besid
 e sound speed\, one can perform quantitative sensing i.e. infer the nature
  of the molecules. On the planetary science front\, most planetary explora
 tion missions have been 'deaf\,' with a few notable exceptions. However\, 
 acoustics offers many benefits to understanding alien environments. I will
  present our latest results of predicting sound propagation on Titan and\,
  time-permitting\, preliminary data for Mars and Venus.Site web du groupe 
 du Prof. Petculescu'sCette conférence est présentée par le RQMP Versant
  Nord du Département de physique de l'Université de Montréal et le Dé
 partement de génie physique de Polytechnique Montréal.
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