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Communication Dans Un Congrès Année : 2016

Streaming non linéaire : rôle de la composante radiale acoustique

Résumé

Non linear streaming created by mono-frequency standing wave inside a cylindrical resonator is studied in this paper. For large values of nonlinear Reynolds numbers, the streaming patterns predicted by Rayleigh in the slow regime, are deformed and new emerging cells appear. Recently, it has been shown that the sole effect of inertia cannot be responsible for this kind of behavior. In the present study it is shown that the radial component of the acoustic velocity plays a key role in the streaming behavior when streaming flow evolves from the slow regime to the fast regime. The acoustic velocity field is computed by solving compressible Navier Stokes equations, under the assumption of isentropic flow . In the slow regime, the radial acoustic velocity has a linear variation with respect de radial space variable outside the boundary layer, as expected. When the streaming becomes fast, this variation is distorted and the linear variation zone reduces significantly. Moreover the order magnitude of the acoustic radial velocity increases during the fast regime and has the same order of magnitude as the radial streaming velocity. There exist a strong interaction between acoustics and streaming in the fast regime through the axial components, which, to our knowledge, was not highlighted until now.
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Dates et versions

hal-02171247 , version 1 (02-07-2019)

Identifiants

  • HAL Id : hal-02171247 , version 1

Citer

Virginie Daru, Diana Baltean, Ida Reyt, Catherine Weisman. Streaming non linéaire : rôle de la composante radiale acoustique. Congrès Français d'Acoustique, Jan 2016, Le Mans, France. ⟨hal-02171247⟩
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