Capillary wave turbulence on a spherical fluid surface in low gravity

Details Capillary wave turbulence on a spherical fluid surface in low gravity Capillary wave turbulence on a spherical fluid surface in low gravity

2007-08-10

arxiv.org/abs/0708.1446v2

Europhysics Letters (EPL) 86 (2009) 14002

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1209/0295-5075/86/14002

We report the observation of capillary wave turbulence on the surface of a fluid layer in a low-gravity environment. In such conditions, the fluid covers all the internal surface of the spherical container which is submitted to random forcing. The surface wave amplitude displays power-law spectrum over two decades in frequency, corresponding to wavelength from $mm$ to a few $cm$. This spectrum is found in roughly good agreement with wave turbulence theory. Such a large scale observation without gravity waves has never been reached during ground experiments. When the forcing is periodic, two-dimensional spherical patterns are observed on the fluid surface such as subharmonic stripes or hexagons with wavelength satisfying the capillary wave dispersion relation.

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