Quantum Turbulence - Decay of Grid Turbulence in a Dissipationless Fluid (Paperback)

QUANTUM TURBULENCE: DECAY OF GRID TURBULENCE IN A DISSIPATIONLESS FLUID We produced grid turbulence in liquid helium at 520 mK to compare with classical experiments and theories. Above T = 1 K, with viscosity present, it has been shown that grid turbulence is equivalent to homogeneous isotropic turbulence in a classical fluid. We seek to investigate the nature of grid turbulence when viscosity is zero. Specifically, in the absence of viscosity in a quantum fluid, through what path does the turbulence decay? To produce grid turbulence, a magnetically shielded superconducting linear motor was designed and built to accelerate and decelerate the grid rapidly in a short distance ( 1 mm), and achieve glide speeds up to 1 m/s, when driven with the properly shaped current pulse. We measured the decay of the turbulence produced by calorimetry technique. Recent theory suggests the decay occurs through a Kelvin-wave cascade on the vortex lines which couples the initially large turbulent eddies to the short wavelength phonon spectrum of the liquid, yielding a characteristic rate of temperature rise. Initial measurements support the Kelvin wave cascade theory.

General

Imprint:	Lap Lambert Academic Publishing
Country of origin:	Germany
Release date:	May 2010
First published:	September 2009
Authors:	Shu-chen Liu
Dimensions:	229 x 152 x 9mm (L x W x T)
Format:	Paperback - Trade
Pages:	156
ISBN-13:	978-3-8383-1538-6
Categories:	Books > Science & Mathematics > Physics > General
LSN:	3-8383-1538-3
Barcode:	9783838315386

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