Search Results - "Schoepe, W"

Vortex Shedding from a Microsphere Oscillating in Superfluid 4He at mK Temperatures and from a Laser Beam Moving in a Bose–Einstein Condensate by Schoepe, W.

“…Turbulent drag of an oscillating microsphere that is levitating in superfluid 4 He at mK temperatures, is unstable slightly above a critical velocity amplitude…”
Get full text

Addendum to “On the Transition from Potential Flow to Turbulence ...” by M. Niemetz, R. Hänninen, and W. Schoepe, J. Low Temp. Phys. 187, 195 (2017) by Schoepe, W.

Get full text

Shedding of Vortex Rings from an Oscillating Sphere in Superfluid 4He Below 0.5 K by Schoepe, W.

“…The onset of turbulent flow around an oscillating sphere is known to occur at a critical velocity where κ is the circulation quantum and ω is the oscillation…”
Get full text

Fluctuations and stability of superfluid turbulence at mK temperatures by Schoepe, W

“…Turbulent flow of superfluid 4He at mK temperatures around an oscillating microsphere is known to be unstable at low driving forces, switching intermittently…”
Get full text

Quartz Tuning Fork: Thermometer, Pressure- and Viscometer for Helium Liquids by Blaauwgeers, R., Blazkova, M., Človečko, M., Eltsov, V. B., de Graaf, R., Hosio, J., Krusius, M., Schmoranzer, D., Schoepe, W., Skrbek, L., Skyba, P., Solntsev, R. E., Zmeev, D. E.

“…Commercial quartz oscillators of the tuning-fork type with a resonant frequency of ∼ 32 kHz have been investigated in helium liquids. The oscillators are found…”
Get full text

Statistics of Intermittent Switching between Potential Flow and Turbulence around an Oscillating Sphere in Superfluid 4He below 0.5 K by Schoepe, W.

“…The flow of superfluid helium at very low temperatures around an oscillating microsphere is known to be unstable slightly above the critical velocity. The flow…”
Get full text

Breakdown of Potential Flow to Turbulence Around a Sphere Oscillating in Superfluid \( pound sterling \) He Above the Critical Velocity by Schoepe, W, Haenninen, R, Niemetz, M

“…The onset of turbulent flow around an oscillating sphere in superfluid \( pound sterling \) He is known to occur at a critical velocity \(v_{\text {c}} \,\sim…”
Get full text

Universal Onset of Quantum Turbulence in Oscillating Flows and Crossover to Steady Flows by Hänninen, R., Schoepe, W.

“…The critical velocity v c for the onset of quantum turbulence in oscillatory flows of superfluid helium is universal and scales as , where κ is the circulation…”
Get full text

Dynamical Scaling of the Critical Velocity for the Onset of Turbulence in Oscillatory Superflows by Hänninen, R., Schoepe, W.

“…The critical velocity v c for the onset of turbulence in oscillatory flows of superfluid helium is known to depend on the oscillation frequency ω , namely…”
Get full text

Vortex Shedding from a Microsphere Oscillating in Superfluid $$^4$$He at mK Temperatures and from a Laser Beam Moving in a Bose–Einstein Condensate by Schoepe, W.

“…Abstract Turbulent drag of an oscillating microsphere that is levitating in superfluid $$^4$$ 4 He at mK temperatures, is unstable slightly above a critical…”
Get full text

Vibrating Quartz Fork—A Tool for Cryogenic Helium Research by Blažková, M., Človečko, M., Eltsov, V. B., Gažo, E., de Graaf, R., Hosio, J. J., Krusius, M., Schmoranzer, D., Schoepe, W., Skrbek, L., Skyba, P., Solntsev, R. E., Vinen, W. F.

“…Oscillating objects such as discs, piles of discs, spheres, grids and wires have been widely used in cryogenic fluid dynamics and in quantum fluids research…”
Get full text

Universal Critical Velocity for the Onset of Turbulence of Oscillatory Superfluid Flow by Hänninen, R., Schoepe, W.

“…The critical velocity v c for the onset of turbulent drag of small spheres oscillating in superfluid 4 He is frequency dependent ( ω /2 π from 100 Hz to 700…”
Get full text

On the Transition to Turbulence of Oscillatory Flow of Liquid Helium-4 by Schoepe, W.

“…Oscillating solid bodies have frequently been used for studying the properties of normal and superfluid helium. In particular, the transition from laminar flow…”
Get full text

Turbulent and Laminar Drag of Superfluid Helium on an Oscillating Microsphere by Jäger, J, Schuderer, B, Schoepe, W

Get full text

Vortex Shedding from an Object Moving in Superfluid \( pound sterling \hbox {He}\) at mK Temperatures and in a Bose-Einstein Condensate by Schoepe, W

“…Vortex shedding from a microsphere oscillating in superfluid \( pound sterling \hbox {He}\) at mK temperatures is compared with that from a laser beam moving…”
Get full text

Vortex Shedding from an Object Moving in Superfluid $$^4\hbox {He}$$ 4 He at mK Temperatures and in a Bose–Einstein Condensate by Schoepe, W.

Get full text

Vortex Shedding from an Object Moving in Superfluid 4 He at mK Temperatures and in a Bose–Einstein Condensate by Schoepe, W

“…Vortex shedding from a microsphere oscillating in superfluid 4 He at mK temperatures is compared with that from a laser beam moving in a Bose–Einstein…”
Get full text

Vortex Shedding from an Object Moving in Superfluid 4He at mK Temperatures and in a Bose–Einstein Condensate by Schoepe, W.

“…Vortex shedding from a microsphere oscillating in superfluid 4 He at mK temperatures is compared with that from a laser beam moving in a Bose–Einstein…”
Get full text

Superfluid Reynolds number and the transition from potential flow to turbulence in superfluid 4He at millikelvin temperatures by Schoepe, W.

“…This comment is on Phys. Rev. Lett. 144 , 155302 (2015) by M.T. Reeves, T.P. Billam, B.P. Anderson, and A.S. Bradley “Identifying a superfluid Reynolds number…”
Get full text

Numerical calculations for large positive magnetoresistance ratios R( B)/ R(0) in insulating materials by Rosenbaum, R., Castro, H., Schoepe, W.

“…Numerical calculations are presented for predicting the large positive magnetoresistance ratios R( B)/ R(0) which are often observed in insulating materials…”
Get full text