Vortex emission from quantum turbulence in superfluid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>4</mml:mn></mml:msup></mml:math>He

Nago, Yusuke; Nishijima, A.; Kubo, Hirokazu; Ogawa, T.; Obara, K.; Yano, H.; Ishikawa, Osamu; Hata, Tōju

doi:10.1103/physrevb.87.024511

Cited by 18 publications

(14 citation statements)

References 38 publications

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“…The vortices will grow and self-reconnect to emit vortex rings. Vortex ring emission has been observed directly in oscillating grid measurements in superfluid 3 He [19] and in vibrating wire measurements in superfluid 4 He [54]. The subsequent fate of the vortex rings will depend on geometry, on temperature, and on the rate of ring emission.…”

Section: Summary and Discussionmentioning

confidence: 99%

Frequency-dependent drag from quantum turbulence produced by quartz tuning forks in superfluidHe4

et al. 2014

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We have measured the drag force from quantum turbulence on a series of quartz tuning forks in superfluid helium. The tuning forks were custom made from a 75-μm-thick wafer. They have identical prong widths and prong spacings, but different lengths to give different resonant frequencies. We have used both the fundamental and overtone flexure modes to probe the turbulent drag over a broad range of frequencies f = ω/2π from 6.5 to 300 kHz. Optical measurements show that the velocity profiles of the flexure modes are well described by a cantilever beam model. The critical velocity for the onset of quantum turbulence at low temperatures is measured to be v c ≈ √ 0.7κ ω where κ is the circulation quantum. The drag from quantum turbulence shows a small frequency dependence when plotted against the scaled velocity v/v c .

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Section: Summary and Discussionmentioning

confidence: 99%

Frequency-dependent drag from quantum turbulence produced by quartz tuning forks in superfluidHe4

et al. 2014

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“…Fork A detects the presence of turbulence by entering the turbulent state. A similar scheme has been used to detect vortex emission from quantum turbulence created by vibrating wires [26]. After this the drive to fork B is switched off and the turbulent state of fork A becomes unstable.…”

Section: A Turbulent Flow Statementioning

confidence: 99%

“…However, often we would find no transition after several hours and we were not able to gather sufficient data for statistics. Instead, we investigated the reduction of the survival time by the presence of vortices generated by the neighboring fork B, similar to measurements made previously using vibrating wires [26]. Several overnight measurement series were made under automated computer control.…”

Section: B Pure Potential Flow Statementioning

confidence: 99%

Stability of flow and the transition to turbulence around a quartz tuning fork in superfluidHe4at very low temperatures

et al. 2014

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We have studied the transition between pure potential flow and turbulent flow around a quartz tuning fork resonator in superfluid 4 He 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.

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“…Until now, all other oscillators measured in superfluid 4 He begin to generate their own turbulence immediately after being exposed to vorticity in the fluid. While this has enabled many rich experiments [33][34][35][36][37]95], it precludes the use of these devices to continuously sense quantum turbulence.…”

Section: Discussionmentioning

confidence: 99%

“…In a classical fluid, there is no critical velocity and the onset of turbulence is continuous. Here, in pure superfluid, there is no turbulent flow or emission of vorticity below v c [35,51,61]. The difference arises because vorticity in superfluid 4 He is nucleated extrinsically from preexisting remnant vortices pinned to the surfaces of the oscillating structures.…”

Section: B Measurement Techniquementioning

confidence: 99%

Damping of a micro-electromechanical oscillator in turbulent superfluid $^4$He: A novel probe of quantized vorticity in the ultra-low temperature regime

Barquist,

Jiang,

Gunther

et al. 2020

Preprint

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We report a comprehensive investigation of the effects of quantum turbulence and quantized vorticity in superfluid 4 He on the motion of a micro-electromechanical systems (MEMS) resonator. We find that the MEMS is uniquely sensitive to quantum turbulence present in the fluid. To generate turbulence in the fluid, a quartz tuning fork (TF) is placed in proximity to the MEMS and driven at large amplitude. We observe that at low velocity, the MEMS is damped by the turbulence, and that above a critical velocity, vc 5 mm s −1 , the turbulent damping is greatly reduced. We find that above vc, the damping of the MEMS is reduced further for increasing velocity, indicating a velocity dependent coupling between the surface of the MEMS and the quantized vortices constituting the turbulence. We propose a model of the interaction between vortices in the fluid and the surface of the MEMS. The sensitivity of these devices to a small number of vortices and the almost unlimited customization of MEMS open the door to a more complete understanding of the interaction between quantized vortices and oscillating structures, which in turn provides a new route for the investigation of the dynamics of single vortices.

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Vortex emission from quantum turbulence in superfluid4He

Cited by 18 publications

References 38 publications

Frequency-dependent drag from quantum turbulence produced by quartz tuning forks in superfluidHe4

Frequency-dependent drag from quantum turbulence produced by quartz tuning forks in superfluidHe4

Stability of flow and the transition to turbulence around a quartz tuning fork in superfluidHe4at very low temperatures

Damping of a micro-electromechanical oscillator in turbulent superfluid $^4$He: A novel probe of quantized vorticity in the ultra-low temperature regime

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