title: Decay of capillary wave turbulence.
abstract: We report on the observation of freely decaying capillary wave turbulence on the surface of a fluid. The capillary wave turbulence spectrum decay is found to be self-similar in time with the same power law exponent as the one found in the stationary regime, in agreement with weak turbulence predictions. The amplitude of all Fourier modes are found to decrease exponentially with time at the same damping rate. The longest wavelengths involved in the system are shown to be damped by a viscous surface boundary layer. These long waves play the role of an energy source during the decay that sustains nonlinear interactions to keep capillary waves in a wave turbulent state.
authors.affiliation: Univ Paris Diderot, Sorbonne Paris Cité, MSC, UMR 7057 CNRS, F-75 013 Paris, France.
authors.forename: Luc
authors.initials: L
authors.lastname: Deike
authors.forename: Michael
authors.initials: M
authors.lastname: Berhanu
authors.forename: Eric
authors.initials: E
authors.lastname: Falcon
mesh_terms: D002197:Capillary Action; D003198:Computer Simulation; D008956:Models, Chemical; D017711:Nonlinear Dynamics; D012212:Rheology / Q000379:methods*; D012996:Solutions / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D012996:Solutions