Frequency-dependent drag from quantum turbulence produced by quartz tuning forks in superfluid 4He

被引：22

作者：

Ahlstrom, S. L. ^{[1
]}

Bradley, D. I. ^{[1
]}

Clovecko, M. ^{[1
]}

Fisher, S. N. ^{[1
]}

Guenault, A. M. ^{[1
]}

Guise, E. A. ^{[1
]}

Haley, R. P. ^{[1
]}

Kolosov, O. ^{[1
]}

McClintock, P. V. E. ^{[1
]}

Pickett, G. R. ^{[1
]}

Poole, M. ^{[1
]}

Tsepelin, V. ^{[1
]}

Woods, A. J. ^{[1
]}

机构：

[1] Univ Lancaster, Dept Phys, Lancaster LA1 4YB, England

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

OSCILLATING CIRCULAR-CYLINDER; KEULEGAN-CARPENTER NUMBERS; LOW-TEMPERATURES; CRITICAL VELOCITY; VORTEX TURBULENCE; GRID TURBULENCE; FINITE CHANNEL; FLOW; TRANSITION; HELIUM;

D O I：

10.1103/PhysRevB.89.014515

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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-mu m-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 = omega/2 pi 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 nu(c) approximate to root 0.7 kappa omega where kappa is the circulation quantum. The drag from quantum turbulence shows a small frequency dependence when plotted against the scaled velocity v/v(c).

引用

页数：10

共 56 条

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