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Visualization of the normal-fluid turbulence in counterflowing superfluid ~4He

机译:逆流〜4He中正常流体湍流的可视化

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摘要

We describe a technique, using thin lines of triplet-state He_2~* molecular tracers created by femtosecond-laser field ionization of helium atoms, for visualizing the flow of the normal fluid in superfluid ~4He, together with its application to thermal counterflow in a channel. We show that, at relatively small velocities, where the superfluid is already turbulent, the flow of the normal fluid remains laminar, but with a distorted velocity profile, while at a higher velocity there is a transition to turbulence. The form of the structure function in this turbulent state differs significantly from that found in types of conventional turbulence. This visualization technique also promises to be applicable to other fluid dynamical problems involving cryogenic helium.
机译:我们描述了一种技术,利用飞秒激光场中氦原子的电离产生的三重态He_2〜*分子示踪剂的细线,可视化超流体〜4He中正常流体的流动,并将其应用于热流中。渠道。我们表明,在相对较小的速度下,超流体已经处于湍流状态,正常流体的流动仍然是层流的,但是速度分布失真,而在较高的速度下会过渡到湍流。在这种湍流状态下,结构功能的形式与传统湍流类型中的形式明显不同。这种可视化技术还有望应用于涉及低温氦气的其他流体动力学问题。

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  • 来源
    《Physical review》 |2015年第9期|094503.1-094503.5|共5页
  • 作者单位

    National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA,Department of Physics, University of Florida, Gainesville, Florida 32611, USA;

    National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA,Mechanical Engineering Department, Florida State University, Tallahassee, Florida 32310, USA;

    National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA,Mechanical Engineering Department, Florida State University, Tallahassee, Florida 32310, USA;

    National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA,Mechanical Engineering Department, Florida State University, Tallahassee, Florida 32310, USA;

    Department of Physics, University of Florida, Gainesville, Florida 32611, USA;

    Department of Physics, Yale University, New Haven, Connecticut 06515, USA;

    School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    tracking and position-sensitive detectors; turbulent flows; convection; and heat transfer;

    机译:跟踪和位置敏感探测器湍流对流;和热传递;

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