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Experiments on wave turbulence : the evolution and growth of second sound acoustic turbulence in superfluid 4He confirm self-similarity.

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>08/2010
<mark>Journal</mark>New Journal of Physics
Volume12
Pages (from-to)083047
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

We report our experiments on the formation of second sound acoustic turbulence in superfluid 4He. The initial growth in spectral amplitude follows power laws that steepen rapidly with increasing harmonic number n, corresponding to a propagating front in frequency space. The lower growth exponents agree well with analytic predictions and numerical modeling. The observed increase in the formation delay with n validates the concept of selfsimilarity in the growth of wave turbulence.