Volume 128, Number 3, November 2019
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||03 January 2020|
Capillary wave turbulence experiments in microgravity
1 Laboratoire Matière et Systèmes Complexes, CNRS UMR 7057 Université Paris Diderot 10 rue Alice Domon et Léonie Duquet, Paris, France
2 Laboratoire de Physique de l'Ecole normale supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris- Diderot - Paris, France
3 Sorbonne Université, CNRS, UMR 7190, Institut Jean Le Rond d'Alembert - F-75005 Paris, France
Received: 12 September 2019
Accepted: 11 November 2019
Using the FLUIDICS (Fluid Dynamics in Space) experiment in the International Space Station, turbulence of capillary waves at the air-water interface is experimentally investigated in weightlessness. Capillary waves are excited in a spherical container partially filled with water and undergoing sinusoidal or random oscillations. The fluctuations of the interface, recorded with two capacitive probes are analyzed by means of the frequency power spectrum of wave elevation. For high enough forcing amplitudes, we report power-law spectra with exponents close to the prediction of weak wave turbulence theory. However, in this experiment the free-surface steepness is not small compared to 1 and thus the investigated regimes correspond to strongly nonlinear wave turbulence.
PACS: 47.35.Pq – Capillary waves / 47.27.-i – Turbulent flows / 81.70.Ha – Testing in microgravity environments
© EPLA, 2020
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