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Simultaneous characterization of temperature and ve lo ci ty profiles using time reversal: Numerical study of free convection

Bouchet , G ; Maurel , A ; GEP ; Institut universitaire des systèmes thermiques industriels ( IUSTI ) ; Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ) -Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ) ; Institut Langevin ondes et images ; Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Université Paris Diderot - Paris 7 ( UPD7 ) -ESPCI ParisTech-Centre National de la Recherche Scientifique ( CNRS )

ISSN: 0295-5075

HAL CCSD;European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2001

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  • Titre:
    Simultaneous characterization of temperature and ve lo ci ty profiles using time reversal: Numerical study of free convection
  • Auteur: Bouchet , G ;
    Maurel , A
  • Autre(s) auteur(s): GEP ; Institut universitaire des systèmes thermiques industriels ( IUSTI ) ; Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ) -Aix Marseille Université ( AMU ) -Centre National de la Recherche Scientifique ( CNRS ) ;
    Institut Langevin ondes et images ; Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Université Paris Diderot - Paris 7 ( UPD7 ) -ESPCI ParisTech-Centre National de la Recherche Scientifique ( CNRS )
  • Sujets: [ PHYS.MECA.MEFL ] Physics [physics]/Mechanics [physics]/Mechanics of the fluids [physics.class-ph]
  • Fait partie de: ISSN: 0295-5075
  • Description: International audience
    – We present an acoustical method, based on time reversal, for simultaneous characterization of temperature and velocity profiles. The method is numerically validated in a case of free convection; the acoustic propagation is obtained from calculations of ray propagation and the convective flow is described by analytical profiles or by fields stemmed from numerical simulation. The ray theory approximation, used to solve the inverse problem, is discussed. Introduction. – Most of the usual techniques for temperature measurement are local and intrusive (hot-wire probe, hot-film sensors, thermocouples). Some optical techniques such as low-contrast shadowgraphy, visualization with thermal camera or induced fluorescence measurement are examples of non-intrusive methods but can be used only for translucid fluids. Furthermore, simultaneous measurement of the velocity field is not possible, or requires the use of another technique. Among these techniques, acoustic waves provide a direct, non-intrusive and non-localized way of probing hydrodynamic flow fields. Several approaches have been proposed in the literature, e.g. ultrasound scattering [1, 2] or tomography [3]. When the acoustic wavelength is small compared with the characteristic length of the flow and for small Mach numbers, the description of the sound flow interaction is restricted to geometrical acoustics; in this context, an ultrasonic technique, based on the time reversal process, has been developed recently to study the structure and dynamics of localized vortices [4, 5]; the presented work extends this method by including a simultaneous measurement of a temperature profile. The aim of this paper is to develop and to numerically validate the method, that can be used as an investigation tool on an experimental setup .
  • Titres liés: info:eu-repo/semantics/altIdentifier/doi/ 10.1209/epl/i2001-00192-1
  • Éditeur: HAL CCSD;European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing
  • Date de publication: 2001
  • Langue: Anglais
  • Identifiant: HAL Id hal--01447039 ; DOI : 10.1209/epl/i2001-00192-1
  • Source: ESPCI Paris (archives ouvertes)

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