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Final published version
Licence: CC BY
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Frequency-dependent drag from quantum turbulence produced by quartz tuning forks in superfluid He4
AU - Tsepelin, Viktor
AU - Ahlstrom, Sean
AU - Bradley, Ian
AU - Clovecko, Marcel
AU - Fisher, Shaun
AU - Guénault, Tony
AU - Guise, Edward Ashley
AU - Haley, Richard
AU - Kolosov, Oleg
AU - McClintock, Peter V. E.
AU - Pickett, George
AU - Poole, Malcolm
AU - Woods, Andrew
N1 - Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
PY - 2014/1/30
Y1 - 2014/1/30
N2 - We have measured the drag force from quantum turbulence on a series of quartz tuning forks in superfluid helium. The tuning forks were custom made from a 75-μm-thick wafer. They have identical prong widths and prong spacings, but different lengths to give different resonant frequencies. We have used both the fundamental and overtone flexure modes to probe the turbulent drag over a broad range of frequencies f=ω/2π from 6.5 to 300 kHz. Optical measurements show that the velocity profiles of the flexure modes are well described by a cantilever beam model. The critical velocity for the onset of quantum turbulence at low temperatures is measured to be vc≈0.7κω−−−−−√ where κ is the circulation quantum. The drag from quantum turbulence shows a small frequency dependence when plotted against the scaled velocity v/vc
AB - We have measured the drag force from quantum turbulence on a series of quartz tuning forks in superfluid helium. The tuning forks were custom made from a 75-μm-thick wafer. They have identical prong widths and prong spacings, but different lengths to give different resonant frequencies. We have used both the fundamental and overtone flexure modes to probe the turbulent drag over a broad range of frequencies f=ω/2π from 6.5 to 300 kHz. Optical measurements show that the velocity profiles of the flexure modes are well described by a cantilever beam model. The critical velocity for the onset of quantum turbulence at low temperatures is measured to be vc≈0.7κω−−−−−√ where κ is the circulation quantum. The drag from quantum turbulence shows a small frequency dependence when plotted against the scaled velocity v/vc
U2 - 10.1103/PhysRevB.89.014515
DO - 10.1103/PhysRevB.89.014515
M3 - Journal article
VL - 89
JO - Physical review B
JF - Physical review B
SN - 1098-0121
IS - 1
M1 - 014515
ER -