L. Skrbek
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View article: Rotating thermal counterflow of He II
Rotating thermal counterflow of He II Open
Horizontally ($Ω\perp \mathbf{v}_{\rm{ns}}$) and axially ($Ω\parallel \mathbf{v}_{\rm{ns}}$) rotating counterflow of superfluid $^4$He (He~II) generated thermally in a square channel is studied using the second sound attenuation technique,…
View article: On Grid-Generated Quantum Turbulence
On Grid-Generated Quantum Turbulence Open
Nearly homogeneous and isotropic turbulence, generated in flows through grids of various forms in wind tunnels or by towing or oscillating grids in stationary samples of classical viscous fluids and the superfluid phases of helium, have pl…
View article: Spherically symmetric counterflow turbulence in open geometry
Spherically symmetric counterflow turbulence in open geometry Open
We report preliminary results on spherical thermal counterflow generated by a small central heater in an open geometry, an open bath of superfluid He~II, as closed-cell experiments could have introduced artifacts such as overheating and bo…
View article: Utilization of cryogenic phases of helium as “magic” working fluids in laboratory experiments: Pushing the boundaries of fluid dynamics
Utilization of cryogenic phases of helium as “magic” working fluids in laboratory experiments: Pushing the boundaries of fluid dynamics Open
A surprisingly large part of the valuable scientific contributions of K. R. Sreenivasan—known to his friends and coworkers as Sreeni—to fluid dynamics is directly connected with precisely controlled benchmark experiments with cryogenic pha…
View article: Modulated turbulent convection: a benchmark model for large scale natural flows driven by diurnal heating
Modulated turbulent convection: a benchmark model for large scale natural flows driven by diurnal heating Open
Our life is strongly affected by turbulent convective flows, driven by time-dependent thermal forcing, especially diurnal heating of the Earth’s surface by the Sun. In a laboratory experiment, we investigate their analogues: We study compl…
View article: Dynamics of quantum turbulence in axially rotating thermal counterflow
Dynamics of quantum turbulence in axially rotating thermal counterflow Open
Generation, statistically steady state, and temporal decay of axially rotating thermal counterflow of superfluid $^4$He (He~II) in a square channel is probed using the second sound attenuation technique, measuring the density of quantized …
View article: Phenomenology of transition to quantum turbulence in flows of superfluid helium
Phenomenology of transition to quantum turbulence in flows of superfluid helium Open
Transition from laminar to turbulent states of classical viscous fluids is complex and incompletely understood. Transition to quantum turbulence (QT), by which we mean the turbulent motion of quantum fluids such as helium II, whose physica…
View article: Editorial for the Special Issue in Honor of Joe Vinen
Editorial for the Special Issue in Honor of Joe Vinen Open
View article: Ion Pools Underneath the Surface of Superfluid $$^4$$He: A Playground of Classical Two-Dimensional Physics
Ion Pools Underneath the Surface of Superfluid $$^4$$He: A Playground of Classical Two-Dimensional Physics Open
Positive and negative ions in superfluid $$^4$$ He (He II) are interesting objects of experimental and theoretical research and serve as important probes to study various aspects of superfluidity. Additionally, with the help of external…
View article: William Frank Vinen
William Frank Vinen Open
William Frank "Joe" Vinen, a pioneer in low-temperature physics, died in Birmingham, UK, on 8 June 2022.He was born on 15 February 1930 in Watford, an English town some 15 miles northwest of London. Vinen earned his undergraduate and gradu…
View article: Thermal Waves and Heat Transfer Efficiency Enhancement in Harmonically Modulated Turbulent Thermal Convection
Thermal Waves and Heat Transfer Efficiency Enhancement in Harmonically Modulated Turbulent Thermal Convection Open
We study turbulent Rayleigh-Bénard convection over four decades of Rayleigh numbers 4×10^{8}
View article: Mass of Abrikosov vortex in high-temperature superconductor YBa$$_2$$Cu$$_3$$O$$_{7-\delta }$$
Mass of Abrikosov vortex in high-temperature superconductor YBa$$_2$$Cu$$_3$$O$$_{7-\delta }$$ Open
View article: Phenomenology of quantum turbulence in superfluid helium
Phenomenology of quantum turbulence in superfluid helium Open
Quantum turbulence—the stochastic motion of quantum fluids such as 4 He and 3 He-B, which display pure superfluidity at zero temperature and two-fluid behavior at finite but low temperatures—has been a subject of intense experimental, theo…
View article: Ubiquity of particle–vortex interactions in turbulent counterflow of superfluid helium
Ubiquity of particle–vortex interactions in turbulent counterflow of superfluid helium Open
View article: Quantum storm in a cold cup
Quantum storm in a cold cup Open
Quantum turbulence, which manifests itself via a tangle of quantized vortices, occurs in quantum fluids, whose properties depend on quantum physics rather than classical physics. Here we report on two limiting forms of quantum turbulence w…
View article: Thermal radiation in Rayleigh-Bénard convection experiments
Thermal radiation in Rayleigh-Bénard convection experiments Open
An important question in turbulent Rayleigh-Bénard convection (RBC) is the effectiveness of convective heat transport, which is conveniently described via the scaling of the Nusselt number (Nu) with the Rayleigh (Ra) and Prandtl (Pr) numbe…
View article: Mass of one bit for fluxonics -- Abrikosov vortex -- in high-Tc YBaCuO superconductor
Mass of one bit for fluxonics -- Abrikosov vortex -- in high-Tc YBaCuO superconductor Open
In fluxonics, superconducting technology of the future, the information bit is represented by fluxon, an elementary magnetic flux tube also known as the Abrikosov vortex. The design of superconductive devices will require the knowledge of …
View article: Mass of Abrikosov vortex in high-temperature superconductor YBaCuO
Mass of Abrikosov vortex in high-temperature superconductor YBaCuO Open
Mass of Abrikosov vortices defied experimental observation for more than four decades. We demonstrate a method of its detection in high-temperature superconductors. Similarly to electrons, fluxons circulate in the direction given by the ma…
View article: Abrikosov vortex mass in high-T_c YBaCuO superconductor emerging from observed circular dichroism of far-infrared transmission
Abrikosov vortex mass in high-T_c YBaCuO superconductor emerging from observed circular dichroism of far-infrared transmission Open
Abrikosov vortices in superconductors are ideal information carriers: they are topologically stable and keep a uniform nano-scale size given by quantum conditions. Low vortex friction in high-T_c materials makes possible fast motion of qua…
View article: Dynamical similarity and instabilities in high-Stokes-number oscillatory flows of superfluid helium
Dynamical similarity and instabilities in high-Stokes-number oscillatory flows of superfluid helium Open
We present a unified analysis of the drag forces acting on oscillating bodies submerged in superfluid helium such as a vibrating wire resonator, tuning forks, a double-paddle oscillator, and a torsionally oscillating disk. We find that for…
View article: Elusive transition to the ultimate regime of turbulent Rayleigh-Bénard convection
Elusive transition to the ultimate regime of turbulent Rayleigh-Bénard convection Open
By using cryogenic ^{4}He gas as the working fluid in a cylindrical cell 0.3 m in both height and diameter, we study the influence of non-Oberbeck-Boussinesq (NOB) effects on the heat transfer in turbulent Rayleigh-Bénard convection (RBC).…
View article: Multiple critical velocities in oscillatory flow of superfluid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts/><mml:none/><mml:mn>4</mml:mn></mml:mmultiscripts></mml:math>due to quartz tuning forks
Multiple critical velocities in oscillatory flow of superfluiddue to quartz tuning forks Open
We report recent investigations into the transition to turbulence in superfluid $^4$He, realized experimentally by measuring the drag forces acting on two custom-made quartz tuning forks with fundamental resonances at 6.5 kHz and 55.5 kHz,…
View article: Coexistence and interplay of quantum and classical turbulence 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:mrow><mml:mn>4</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>: Decay, velocity decoupling, and counterflow energy spectra
Coexistence and interplay of quantum and classical turbulence in superfluid: Decay, velocity decoupling, and counterflow energy spectra Open
We report complementary experimental, numerical and theoretical study of\nturbulent coflow, counterflow and pure superflow of superfluid He-4 in a\nchannel, resulting in a physically transparent and relatively simple model of\ndecaying qua…
View article: Anisotropic behaviour of transmission through thin superconducting NbN film in parallel magnetic field
Anisotropic behaviour of transmission through thin superconducting NbN film in parallel magnetic field Open
Transmission of terahertz waves through a thin layer of the superconductor NbN deposited on an anisotropic R-cut sapphire substrate is studied as a function of temperature in a magnetic field oriented parallel with the sample. A significan…
View article: Coexistence and interplay of quantum and classical turbulence of superfluid He-4
Coexistence and interplay of quantum and classical turbulence of superfluid He-4 Open
Our complementary experimental, numerical and theoretical studies of decaying turbulent co-flow, counter-flow and pure super-flow of superfluid $^4$He in a channel, reported on in this paper, result in physically transparent and relatively…
View article: Quantum Turbulence of Bellows-Driven 4He Superflow: Decay
Quantum Turbulence of Bellows-Driven 4He Superflow: Decay Open
We report on studies of quantum turbulence with second-sound in superfluid 4He in which the turbulence is generated by the flow of the superfluid component through a wide square channel, the ends of which are plugged with sintered silver s…