Abstract
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 −1 of the oscillator. By analyzing experimental data we consider a way of matching the two ways of estimating Q −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.
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Acknowledgements
We wish to thank A. Badía Majós for fruitful discussions. This work was partially supported by grant PICT00-03-08937 from ANPCyT, Argentina and 06/C252 grant from U.N. Cuyo.
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Zemma, E., Luzuriaga, J. Turbulent Flow Around an Oscillating Body in Superfluid Helium: Dissipation Characteristics of the Nonlinear Regime. J Low Temp Phys 172, 256–265 (2013). https://doi.org/10.1007/s10909-013-0862-1
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DOI: https://doi.org/10.1007/s10909-013-0862-1