منابع مشابه
On developed superfluid turbulence
Superfluid turbulence is governed by two dimensionless parameters. One of them is the intrinsic parameter q which characterizes the relative value of the friction force acting on a vortex with respect to the non-dissipative forces. The inverse parameter q−1 plays the same role as the Reynolds number Re = UR/ν in classical hydrodynamics. It marks the transition between the ”laminar” and turbulen...
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We analyse the implications of superfluid turbulence for neutron star physics. We begin by extending our previous results for the mutual friction force for a straight vortex array to account for the self-induced flow which arises when the vortices are curved. We then discuss Vinen’s phenomenological model for isotropic turbulence, and derive the associated (Gorter-Mellink) form for the mutual f...
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Superfluid helium consists of two inter-penetrating fluids, a viscous normal fluid and an inviscid superfluid, coupled by a mutual friction. We develop a two-fluid shell model to study superfluid turbulence and investigate the energy spectra and the balance of fluxes between the two fluids in a steady state. At sufficiently low temperatures a ’bottle-neck’ develops at high wavenumbers suggestin...
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We report observation of an inverse energy cascade in second sound acoustic turbulence in He II. Its onset occurs above a critical driving energy and it is accompanied by giant waves that constitute an acoustic analogue of the rogue waves that occasionally appear on the surface of the ocean. The theory of the phenomenon is developed and shown to be in good agreement with the experiments.
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We report on measurements of energy spectra, second and higher order structure functions in bubbly turbulence. The void fraction is up to 2.9 % with an mean equivalent bubble size of 3-5 mm. We find the results of [I. Mazzitelli, D. Lohse, F. Toschi, Phys. Fluids, 15 L5 (2003)] qualitatively confirmed, i.e. a more pronounced energy enhancement on small scales than on large scales due to the pre...
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ژورنال
عنوان ژورنال: Journal of Low Temperature Physics
سال: 2004
ISSN: 0022-2291
DOI: 10.1023/b:jolt.0000041269.56070.2d