Volume 119, Number 2, July 2017
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||05 October 2017|
Surface-wave Doppler velocimetry in a liquid metal: Inferring the bifurcations of the subsurface flow
1 Laboratoire d'Acoustique de l'Université du Maine, CNRS UMR 6613/Univ. du Maine F-72085 Le Mans, Cedex 9, France
2 Service de Physique de l'Etat Condensé, CEA, CNRS UMR 3680, Université Paris-Saclay, CEA Saclay F-91191 Gif-sur-Yvette, France
3 Laboratoire de Physique, Ecole Normale Supérieure de Lyon, CNRS UMR 5672, Université de Lyon, 46 Allée d'Italie, F-69364 Lyon, Cedex 07, France
Received: 19 May 2017
Accepted: 11 September 2017
We introduce a velocimetry technique based on the Doppler-shift of surface waves propagating between an emitter and a receiver. In the limit of scale separation between the wavelength and the scale of the flow, we derive the direct connection between the subsurface flow and the measured phase shift between emitter and receiver. Because of its ease of implementation and high sensitivity, this method is useful to detect small velocities in liquid metal flows, where acoustical and optical methods remain challenging. As an example, we study the Hopf bifurcation of a Kolmogorov flow of Galinstan.
PACS: 47.35.Bb – Gravity waves / 47.35.Tv – Magnetohydrodynamic waves / 47.20.Ky – Nonlinearity, bifurcation, and symmetry breaking
© EPLA, 2017
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