Fractal dimension of superfluid turbulence : A random-walk toy model

Author

Sciacca, Michele

Jou i Mirabent, David,

Mongiovì, Maria Stella

Publication date

2014

Abstract

This paper deals with the fractal dimension of a superuid vortex tangle. It extends a previous model [1] (which was proposed for very low temperature), and it proposes an alternative random walk toy model, which is valid also for finite temperature. This random walk model combines a recent Nemirovskii's proposal, and a simple modelization of a self-similar structure of vortex loops (mimicking the geometry of the loops of several sizes which compose the tangle). The fractal dimension of the vortex tangle is then related to the exponents describing how the vortex energy per unit length changes with the length scales, for which we take recent proposals in the bibliography. The range between 1.35 and 1.75 seems the most consistent one.

Document Type

Article

Language

English

Subjects and keywords

Superfluid turbulence; Quantum vortices; Random walks; Fractal dimension

Publisher

 

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Rights

open access

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