J. Phys. II France
Volume 3, Numéro 6, June 1993
Page(s) 767 - 773
DOI: 10.1051/jp2:1993166
J. Phys. II France 3 (1993) 767-773

Ultrasound scattering by buoyancy driven flows

J. F. Pinton, C. Laroche, S. Fauve and C. Baudet

Laboratoire de Physique, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364 Lyon, France

(Received 18 January 1993, accepted 5 April 1993)

We show experimentally that the scattering of sound by temperature inhomo-geneities may be used as a non-intrusive method to investigate the space-time characteristics of buoyancy-driven flows. We study the thermal plume generated in air by a horizontal hot wire as a test flow: we show that the onset of time-dependent instabilities as well as the advection of thermal inhomogeneities by the mean flow can be studied with our measurement technique.

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