Stability of flow and the transition to turbulence around a quartz tuning fork in superfluid 4He at very low temperatures

被引：15

作者：

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

Fear, M. J. ^{[1
]}

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

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

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

Lawson, C. R. ^{[1
]}

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

Schanen, R. ^{[1
]}

Tsepelin, V. ^{[1
]}

Wheatland, L. A. ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 21期

基金：

英国工程与自然科学研究理事会;

关键词：

VIBRATING-WIRE; OSCILLATING MICROSPHERE; QUANTUM TURBULENCE; MK TEMPERATURES; HELIUM LIQUIDS; POTENTIAL FLOW; LAMINAR; VISCOMETER;

D O I：

10.1103/PhysRevB.89.214503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the transition between pure potential flow and turbulent flow around a quartz tuning fork resonator in superfluid He-4 at millikelvin temperatures. Turbulent flow is identified by an additional drag force on the fork prongs due to the creation of quantized vortices. When driven at a constant driving force amplitude, the transition to turbulence causes an abrupt decrease in the velocity amplitude of the prongs. For a range of driving forces, continuous switching is observed between the two flow states. We have made a statistical study of the switching characteristics and of the lifetimes of the unstable states. We find a characteristic velocity nu(star) which separates quasistable turbulent flow at higher velocities and quasistable potential flow at lower velocities. We show that the potential-to-turbulent flow transition is driven by random processes involving remanent vortices pinned to the prongs.

引用

页数：9

共 32 条

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