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  • We present an experimental study of the decay of He II turbulence created mechanically, by a bellows-induced flow past a stationary grid in a 7x7 mm(2) superfluid wind tunnel. The temporal decay L(t) originating from various steady-states of vortex line length per unit volume, L (0), has been observed based on measurements of the attenuation of second-sound, in the temperature range 1.17 K < T < 1.95 K. Each presented decay curve is the average of up to 150 single decay events. We find that, independently of T and L (0), within seconds past the sudden stop of the drive, all the decay curves show a universal behavior lasting up to 200 s, of the form L(t)ae(t-t (0))(-3/2), where t (0) is the virtual origin time. From this decay process we deduce the effective kinematic viscosity of turbulent He II. We compare our results with the bench-mark Oregon towed grid experiments and, despite our turbulence being non-homogeneous, find strong similarities.
  • We present an experimental study of the decay of He II turbulence created mechanically, by a bellows-induced flow past a stationary grid in a 7x7 mm(2) superfluid wind tunnel. The temporal decay L(t) originating from various steady-states of vortex line length per unit volume, L (0), has been observed based on measurements of the attenuation of second-sound, in the temperature range 1.17 K < T < 1.95 K. Each presented decay curve is the average of up to 150 single decay events. We find that, independently of T and L (0), within seconds past the sudden stop of the drive, all the decay curves show a universal behavior lasting up to 200 s, of the form L(t)ae(t-t (0))(-3/2), where t (0) is the virtual origin time. From this decay process we deduce the effective kinematic viscosity of turbulent He II. We compare our results with the bench-mark Oregon towed grid experiments and, despite our turbulence being non-homogeneous, find strong similarities. (en)
Title
  • The Decay of Forced Turbulent Coflow of He II Past a Grid
  • The Decay of Forced Turbulent Coflow of He II Past a Grid (en)
skos:prefLabel
  • The Decay of Forced Turbulent Coflow of He II Past a Grid
  • The Decay of Forced Turbulent Coflow of He II Past a Grid (en)
skos:notation
  • RIV/00216208:11320/14:10291143!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • I, P(GAP203/11/0442), S
http://linked.open...iv/cisloPeriodika
  • 1-2
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
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http://linked.open...dnocenehoVysledku
  • 9915
http://linked.open...ai/riv/idVysledku
  • RIV/00216208:11320/14:10291143
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • Grid; Second-sound; Superfluid He-4; Decay; Quantum turbulence (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • US - Spojené státy americké
http://linked.open...ontrolniKodProRIV
  • [0E205CD3E739]
http://linked.open...i/riv/nazevZdroje
  • Journal of Low Temperature Physics
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...vavai/riv/projekt
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 175
http://linked.open...iv/tvurceVysledku
  • Skrbek, Ladislav
  • Babuin, Simone
  • Varga, Emil
http://linked.open...ain/vavai/riv/wos
  • 000332486200043
issn
  • 0022-2291
number of pages
http://bibframe.org/vocab/doi
  • 10.1007/s10909-013-0938-y
http://localhost/t...ganizacniJednotka
  • 11320
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