Acoustic and streaming velocity components in a resonant waveguide at high acoustic levels.
Rayleigh streaming is a steady flow generated by the interaction between an acoustic wave and a solid wall, generally assumed to be second order in a Mach number expansion. Acoustic streaming is well known in the case of a stationary plane wave at low amplitude: it has a half-wavelength spatial periodicity and the maximum axial streaming velocity is a quadratic function of the acoustic velocity amplitude at antinode. For higher acoustic levels, additional streaming cells have been observed. Results of laser Doppler velocimetry measurements are here compared to direct numerical simulations. The evolution of axial and radial velocity components for both acoustic and streaming velocities is studied from low to high acoustic amplitudes. Two streaming flow regimes are pointed out, the axial streaming dependency on acoustics going from quadratic to linear. The evolution of streaming flow is different for outer cells and for inner cells. Also, the hypothesis of radial streaming velocity being of second order in a Mach number expansion, is not valid at high amplitudes. The change of regime occurs when the radial streaming velocity amplitude becomes larger than the radial acoustic velocity amplitude, high levels being therefore characterized by nonlinear interaction of the different velocity components.
Arts et Métiers ParisTech - Lab. DynFluid - 151 bd de l'Hôpital 75013 Paris, LIMSI, CNRS, F-91405 Orsay, France.
Virginie
V
Daru
Arts et Métiers ParisTech - Lab. DynFluid - 151 bd de l'Hôpital 75013 Paris, LIMSI, CNRS, F-91405 Orsay, France.
Ida
I
Reyt
Institut Pprime, CNRS - Université de Poitiers - ENSMA, ENSIP, 6 rue Marcel Doré, Bâtiment B17 - BP 633, 86022 Poitiers Cedex, France.
Hélène
H
Bailliet
Sorbonne Universités, UPMC Univ Paris 06, UFR d'Ingénierie, 4 Place Jussieu, 75252 Paris Cedex 05, LIMSI, CNRS, F-91405 Orsay, France.
Catherine
C
Weisman
Sorbonne Universités, UPMC Univ Paris 06, UFR d'Ingénierie, 4 Place Jussieu, 75252 Paris Cedex 05, LIMSI, CNRS, F-91405 Orsay, France.
Diana
D
Baltean-Carlès