Stability of flow and the transition to turbulence around a quartz tuning fork in superfluid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>4</mml:mn></mml:mmultiscripts></mml:math>at very low temperatures

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

doi:10.1103/physrevb.89.214503

Cited by 19 publications

(10 citation statements)

References 31 publications

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“…2, we report the QTFs resonance curves in terms of the QTF current, for both the fundamental and the first overtone flexural modes. For each QTF, the two resonance profiles were separately fitted by using pseudo-Lorentzian functions [20], in order to determine the peak frequencies f n and the full width at halfmaximum Δf n . In Fig.…”

Section: Custom-made Tuning Forks and Their Characterizationmentioning

confidence: 99%

Analysis of overtone flexural modes operation in quartz-enhanced photoacoustic spectroscopy

Tittel¹,

Sampaolo²,

Patimisco³

et al. 2016

Opt. Express

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Abstract:A detailed investigation of a set of custom quartz tuning forks (QTFs), operating in the fundamental and first overtone flexural modes is reported. Support losses are the dominant energy dissipation processes when the QTFs vibrate at the first overtone mode. These losses can be decreased by increasing the ratio between the prong length and its thickness. The QTFs were implemented in a quartz enhanced photoacoustic spectroscopy (QEPAS) based sensor operating in the near-IR spectral range and water vapor was selected as the gas target. QTF flexural modes having the highest quality factor exhibit the largest QEPAS signal, demonstrating that, by optimizing the QTF prongs sizes, overtone modes can provide a higher QEPAS sensor performance with respect to using the fundamental mode.

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Section: Custom-made Tuning Forks and Their Characterizationmentioning

confidence: 99%

Analysis of overtone flexural modes operation in quartz-enhanced photoacoustic spectroscopy

Tittel¹,

Sampaolo²,

Patimisco³

et al. 2016

Opt. Express

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“…In panel (a) of the figure, we show the tuning fork velocity as a function of the driving force. The clear jump in the slope of the tuning fork response (marking greatly increased dissipation) indicates the onset of turbulence production, see for example references 12,13 .…”

Section: Referring Tomentioning

confidence: 99%

Nanoscale Real-Time Detection of Quantum Vortices at Millikelvin Temperatures

Guthrie

Kafanov

Noble

et al. 2020

Preprint

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Since we still lack a theory of classical turbulence, attention has focused on the conceptually simpler turbulence in quantum fluids. Can such systems of identical singly-quantized vortices provide a physically accessible "toy model" of the classical counterpart? That said, we have hitherto lacked detectors capable of the real-time, non-invasive probing of the wide range of length scales involved in quantum turbulence. However, we demonstrate here the real-time detection of quantum vortices by a nanoscale resonant beam in superﬂuid 4He at 10 mK. The basic idea is that we can trap a single vortex along the length of a nanobeam and observe the transitions as a vortex is either trapped or released, which we observe through the shift in the resonant frequency of the beam. With a tuning fork source, we can control the ambient vorticity density and follow its influence on the vortex capture and release rates. But, most important, we show that these devices are capable of probing turbulence on the micron scale.

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“…There has been significant success with injected electrons [9][10][11][12]. Currently, this method has only been able to measure average properties about large scale flow, such as the average L. In the past two decades, small oscillating objects, such as vibrating wires [7,8,; tuning forks [47][48][49][50][51][52][53][54][55][56][57][58][59][60]; micro-spheres [61][62][63][64][65][66][67]; and vibrating grids [40,[68][69][70][71][72][73], have successfully investigated many properties of QT in 4 He and 3 He over a large range of temperatures, including the ultra-low temperature regime. They have been particularly useful in understanding the generation of QT and the crossover from laminar to turbulent flow.…”

Section: Introductionmentioning

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

Cited by 19 publications

References 31 publications

Analysis of overtone flexural modes operation in quartz-enhanced photoacoustic spectroscopy

Analysis of overtone flexural modes operation in quartz-enhanced photoacoustic spectroscopy

Nanoscale Real-Time Detection of Quantum Vortices at Millikelvin 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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