You are here

Determination of the effective kinematic viscosity for the decay of quasiclassical turbulence in superfluid He-4

Title: Determination Of The Effective Kinematic Viscosity For The Decay Of Quasiclassical Turbulence In Superfluid He-4.
45 views
29 downloads
Name(s): Gao, J., author
Guo, W., author
Vinen, W. F., author
Type of Resource: text
Genre: Text
Date Issued: 2016-09-01
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The energy dissipation of quasiclassical homogeneous turbulence in superfluid He-4 (He II) is controlled by an effective kinematic viscosity nu', which relates the energy decay rate dE / dt to the density of quantized vortex lines L as dE / dt = -nu'(kappa L)(2). The precise value of nu' is of fundamental importance in developing our understanding of the dissipation mechanism in He II, and it is also needed in many high-Reynolds-number turbulence experiments and model testing that use He II as the working fluid. However, a reliable determination of nu' requires the measurements of both E(t) and L(t), which was never achieved. Here we discuss our study of the quasiclassical turbulence that emerges in the decay of thermal counterflow in He II above 1 K. We were able to measure E(t) by using a recently developed flow-visualization technique and L(t) via second-sound attenuation. We report the nu' values in a wide temperature range determined from a comparison of the time evolution of E(t) and L(t).
Identifier: FSU_libsubv1_wos_000383033500004 (IID), 10.1103/PhysRevB.94.094502 (DOI)
Keywords: counterflow turbulence, currents, dissipation, grid turbulence, heat current, liquid helium-ii, mutual friction, pressure, quantum turbulence, temperatures
Publication Note: The publisher’s version of record is available at https://doi.org/10.1103/PhysRevB.94.094502
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000383033500004
Owner Institution: FSU
Is Part Of: Physical Review B.
2469-9950
Issue: iss. 9, vol. 94

Choose the citation style.
Gao, J., Guo, W., & Vinen, W. F. (2016). Determination Of The Effective Kinematic Viscosity For The Decay Of Quasiclassical Turbulence In Superfluid He-4. Physical Review B. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000383033500004