Turbulent Flow Around an Oscillating Body in Superfluid Helium: Dissipation Characteristics of the Nonlinear Regime
Zemma
E
author
Luzuriaga
J
author
2013
By examining the resonance curves of an oscillator submerged in superfluid liquid helium, it is found that their shape is affected by two distinct dissipation regimes when the amplitude is large enough to generate turbulence in the liquid. In a resonance curve, the central part close to resonance, may be in a turbulent regime, but the response is of much lower amplitude away from the resonance frequency, so that the oscillation can still be in the linear regime for frequencies not exactly at resonance. This introduces an ambiguity in estimating the inverse quality factor Q âˆ’1 of the oscillator. By analyzing experimental data we consider a way of matching the two ways of estimating Q âˆ’1 and use the information to evaluate the frictional force as a function of velocity in a silicon paddle oscillator generating turbulence in the superfluid.
Quantum fluids
Turbulence
Superfluid helium
Nonlinear oscillator
Vibrating paddle
Critical velocity
exported from refbase (http://fisica.cab.cnea.gov.ar/bt/refbase/show.php?record=662), last updated on Sat, 01 Oct 2016 13:19:13 -0300
text
10.1007/s10909-013-0862-1
Zemma+Luzuriaga2013
Journal of Low Temperature Physics
J. Low Temp. Phys.
2013
Springer US
continuing
periodical
academic journal
172
3-4
256
265
0022-2291