Characterization of a large vortex using acoustic time-reversal mirrors |
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| Authors: | S. Manneville A. Maurel P. Roux M. Fink |
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| Affiliation: | (1) Laboratoire Ondes et Acoustique (URA CNRS 1503), ESPCI, Université Paris VII, 10 rue Vauquelin, 75005 Paris, France, FR;(2) Laboratoire de Physique et Mécanique des Milieux Hétérogènes (URA CNRS 857), ESPCI, 10 rue Vauquelin, 75005 Paris, France, FR |
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| Abstract: | We report new results on the ultrasonic characterization of a fluid flow using an acoustic time-reversal mirror (TRM). The structure of a large vortex generated by a rotating disk in a hollow cylinder is investigated both inside and below the cylinder. For mean-flow characterization, the TRM is shown to be a powerful vorticity detector. Experimental time-of-flight data are successfully compared to a numerical simulation of the flow and the orthoradial velocity is reconstructed using simple geometrical acoustics. Real-time measurements allow us to extract the precession motion of the vortex, providing direct, non-intrusive, and dynamical information on the flow. Received 23 April 1998 |
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| Keywords: | PACS. 43.30+m Underwater sound - 43.35+d Ultrasonics quantum acoustics and physical effects of sound - 47.32-y Rotational flow and vorticity |
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