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首页> 外文期刊>Physical review >Stability of flow and the transition to turbulence around a quartz tuning fork in superfluid ~4He at very low temperatures
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Stability of flow and the transition to turbulence around a quartz tuning fork in superfluid ~4He at very low temperatures

机译：在非常低的温度下，超流体〜4He中的石英音叉周围的流动稳定性和湍流过渡

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摘要

We have studied the transition between pure potential flow and turbulent flow around a quartz tuning fork resonator in superfluid ~4He 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 v~* 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.
机译：我们研究了在毫流体温度下，超流体〜4He中石英音叉谐振器周围的纯势流和湍流之间的过渡。由于产生了量化的涡流，叉叉上的附加阻力可识别湍流。当以恒定的驱动力幅度驱动时，向湍流的过渡会导致插脚的速度幅度突然降低。对于一定范围的驱动力，可以观察到两种流动状态之间的连续切换。我们对开关特性和不稳定状态的寿命进行了统计研究。我们发现了一个特征速度v〜*，它将速度较高时的准湍流和速度较低时的准势流分开。我们表明，潜在的湍流过渡是由随机过程驱动的，该过程涉及固定到插脚上的剩余涡流。

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  • 来源
    《Physical review》 |2014年第21期|214503.1-214503.9|共9页
  • 作者

    D. I. Bradley; M. J. Fear; S. N. Fisher; A. M. Guenault; R. P. Haley; C. R. Lawson; G. R. Pickett; R. Schanen; V. Tsepelin; L. A. Wheatland;

  • 作者单位

    Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;

    Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;

    Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;

    Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;

    Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;

    Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;

    Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;

    Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;

    Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;

    Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom;

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  • 正文语种 eng
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  • 关键词

    transition to turbulence;

    机译：过渡到湍流;

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