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Turbulent flow around an oscillating body in superfluid helium: dissipation characteristics of the nonlinear regime
(Springer, 2013-01)
By examining the resonance curves of an oscillator submerged in superfluid liquid helium, it is found that their shape is affected by two distinct dissipation regimes when the amplitude is large enough to generate turbulence ...
Vortex pseudomomentum and dissipation in a superfluid vortex lattice
(IOP Publishing, 2008-07)
We propose an alternative approach to the dissipative vortex dynamics occurring in a superfluid vortex lattice at finite temperatures. Focusing upon the pseudomomentum of a vortex and its surrounding quasiparticles, we ...
A quantitative experiment on the fountain effect in superfluid helium
(IOP Publishing, 2017-08-17)
Superfluid helium, a state of matter existing at low temperatures, shows many remarkable properties. One example is the so called fountain effect, where a heater can produce a jet of helium. This converts heat into mechanical ...
Superfluid 4He: brief notes on collective energy excitations and specific heat.
(Instituto de Física USPSão Paulo, 2013)
These brief notes about some amazing properties of the helium superfluid have been written to graduate and postgraduate students of physics. We have estimated some collective energy excitations (linear vortices, energy ...
Anomalous Trajectories of H2 Solid Particles Observed Near a Sphere Oscillating in Superfluid Turbulent 4He
(Springer, 2013-05)
Using a relatively low cost apparatus, consisting of a glass dewar and a digital camera capable of taking images at 240 frames per second we have observed trajectories of frozen H2 particles which follow the flow of liquid ...
Mutual friction in helium II: A microscopic approach
(American Institute of Physics, 2009-12)
We develop a microscopic model of mutual friction represented by the dissipative dynamics of a normal fluid flow which interacts with the helical normal modes of vortices comprising a lattice in thermal equilibrium. Such ...
Free expansion of attractive and repulsive Bose-Einstein condensed vortex states
(2002-03-01)
A numerical study of the time-dependent Gross-Pitaevskii equation for an axially symmetric trap to obtain insight into the free expansion of vortex states of BEC is presented. As such, the ratio of vortex-core radius to ...
Effects of the mean free path and relaxation in a model for the aggregation of particles in superfluid media
(The Journal of Chemical Physics, 2018)