Motion of Suspended Particles in Turbulent Superflow of Liquid Helium II

Chung, David Y.; Critchlow, P. R.

doi:10.1103/physrevlett.14.892

Cited by 23 publications

(8 citation statements)

References 3 publications

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“…Visualizing the flow of superfluid 4 He has long been of interest to the scientific community [1,2]. Recently, particle image velocimetry with polymer micro-spheres and hydrogen isotopes has been used to study liquid helium flows [3,4] and solid hydrogen tracers have been used to visualize the quantized vortices [5,6].…”

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confidence: 99%

Metastable Helium Molecules as Tracers in SuperfluidHe4

et al. 2009

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Metastable helium molecules generated in a discharge near a sharp tungsten tip immersed in superfluid 4He are imaged using a laser-induced-fluorescence technique. By pulsing the tip, a small cloud of He(2*) molecules is produced. We can determine the normal-fluid velocity in a heat-induced counterflow by tracing the position of a single molecule cloud. As we run the tip in continuous field-emission mode, a normal-fluid jet from the tip is generated and molecules are entrained in the jet. A focused 910 nm pump laser pulse is used to drive a small group of molecules to the first excited vibrational level of the triplet ground state. Subsequent imaging of the tagged molecules with an expanded 925 nm probe laser pulse allows us to measure the flow velocity of the jet. The techniques we developed provide new tools in quantitatively studying the normal fluid flow in superfluid helium.

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confidence: 99%

Metastable Helium Molecules as Tracers in SuperfluidHe4

et al. 2009

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“…Visualizing the flow of superfluid 4 He (He(ii)) has long been of interest to the scientific community [8][9][10][11] . Particle image velocimetry (PIV), a quantitative visualization technique that records the motion of micrometre-scale solid particles suspended in the fluid and uses that information to map out the flow field of a dynamic fluid 12 , has been used extensively in classical fluids, but only applied in the past few years to the study of liquid helium fluid dynamics 13,14 .…”

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Large-scale turbulent flow around a cylinder in counterflow superfluid4He (He (II))

2005

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“…This equation has the property that as r --+ 0% 0 ---> 0. From the boundary condition (14) we see in the absence of v, that flow is toward the sphere for 0 < re/2. An approximate solution to (21) is 0 ~ (2/~cr) x/a.…”

Section: Boundary Conditionsmentioning

confidence: 88%

Modification of Stokes' law for a heated sphere in liquid helium II

Springett

1971

J Low Temp Phys

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It is shown that the counterflow which occurs at low heat inputs in liquid helium below the )~ point modifies the wake behind a steadily moving sphere. The result is valid for a low Reynolds number and limits on the range of the physical variables are given. The outflow of normal fluid results in an increased drag on the sphere. Some discussion is given of the relevance of this result to experiments on small H -D particles in liquid helium.

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Motion of Suspended Particles in Turbulent Superflow of Liquid Helium II

Cited by 23 publications

References 3 publications

Metastable Helium Molecules as Tracers in SuperfluidHe4

Metastable Helium Molecules as Tracers in SuperfluidHe4

Large-scale turbulent flow around a cylinder in counterflow superfluid4He (He (II))

Modification of Stokes' law for a heated sphere in liquid helium II

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