Visualization of Superfluid Helium Flow

Paoletti, Matthew S.; Fiorito, R.; Sreenivasan, Katepalli R.; Lathrop, Daniel P.

doi:10.1143/jpsj.77.111007

Cited by 85 publications

(105 citation statements)

References 19 publications

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“…On the other hand, the group of University of Maryland succeeded in the application of PTV (Particle Tracking Velocimeter) to the thermal counter flow through a vertical square duct with a heater at the bottom by using solid hydrogen micro particles as tracers [6,7]. The highlight of the result is the finding that there are two groups of tracer particles having positive and negative (towards the heater) velocities.…”

Section: Comparison Of Velocity Measured By Piv With Theoretical Predmentioning

confidence: 99%

“…In fact, as for the experimental studies mainly based on the velocity measurement, only a few experiments have been conducted, in which the flow visualization method by using solid particle tracers [1] and Laser Doppler Velocimeter [2] has been applied. Recently, particle image velocimeter (PIV) has come to be used for superfluid measurements [3][4][5][6][7]. In all these experiments the normal component flow velocity was measured by tracking tracer particles.…”

Section: Introductionmentioning

confidence: 99%

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Effect of tracer particles-quantized vortices interaction on PIV measurement result

Murakami¹

2014

AIP Conference Proceedings

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Abstract. PIV (Particle Image Velocimeter) was applied to the measurement of He II thermal counterflow jet. However, the velocity measured with a PIV was smaller than the theoretical velocity of the normal component. Sergeev et al. explained that this was caused by the interaction between tracer particles and tangled mass of quantized vortices, and presented phenomenological formulae for the deceleration of particle motions in the two limiting cases of the vortex density. It is seen the present PIV experimental results qualitatively agree with the phenomenological formulae in the linear case of small or moderate values of heat input. The critical heat flux experimentally derived for the transition from the linear to non-linear regimes is found to be in fair agreement with the prediction.

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Section: Comparison Of Velocity Measured By Piv With Theoretical Predmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of tracer particles-quantized vortices interaction on PIV measurement result

Murakami¹

2014

AIP Conference Proceedings

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“…In the transition to the turbulent states, remnant vortices, i.e., quantized vortices attached to the container wall, are stretched by the mutual friction between the superfluid and normal fluid components, growing into a tangle through reconnections with other vortices. Counterflow turbulence was visualized only recently in experiments [13] and is providing an active ground of study in quantum turbulence [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Countersuperflow instability in miscible two-component Bose-Einstein condensates

2011

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We study theoretically the instability of countersuperflow, i.e., two counterpropagating miscible superflows, in uniform two-component Bose-Einstein condensates. Countersuperflow instability causes mutual friction between the superfluids, causing a momentum exchange between the two condensates, when the relative velocity of the counterflow exceeds a critical value. The momentum exchange leads to nucleation of vortex rings from characteristic density patterns due to the nonlinear development of the instability. Expansion of the vortex rings drastically accelerates the momentum exchange, leading to a highly nonlinear regime caused by intervortex interaction and vortex reconnection between the rings. For a sufficiently large interaction between the two components, rapid expansion of the vortex rings causes isotropic turbulence and the global relative motion of the two condensates relaxes. The maximum vortex line density in the turbulence is proportional to the square of the relative velocity.

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“…In such experiments macroscopic filament-like structures have been observed [4,[10][11][12]. On the other hand the motion of micrometersized solid particles in liquid helium is now being extensively studied by theorists [13][14][15] and experimentalists [17,18] in the context of quantum turbulence. It was found experimentally [16][17][18] that solid hydrogen particles in superfluid helium aggregate into extended filaments.…”

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confidence: 99%

Formation of Metallic Nanowires by Laser Ablation in Liquid Helium

et al. 2011

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Laser ablation of metals in liquid helium results in the formation of metal filaments with diameters on the order of 2-10 nanometres and of spherical nanoparticles. In superfluid helium these nanowires aggregate into centimeter-sized networks. We study the morphology and the electric conductivity of these large aggregates, as well as extinction spectra and the crystalline structure of the individual nanofragments. We discuss the effect of superfluidity on the mechanisms of coalescence processes at the nanometer and centimeter scales.

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Visualization of Superfluid Helium Flow

Cited by 85 publications

References 19 publications

Effect of tracer particles-quantized vortices interaction on PIV measurement result

Effect of tracer particles-quantized vortices interaction on PIV measurement result

Countersuperflow instability in miscible two-component Bose-Einstein condensates

Formation of Metallic Nanowires by Laser Ablation in Liquid Helium

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