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Translational oscillations of a microsphere in superfluid helium
- Source :
- Physica B: Condensed Matter. 210:201-208
- Publication Year :
- 1995
- Publisher :
- Elsevier BV, 1995.
-
Abstract
- The translational motion of a microsphere (radius 100 μm) in liquid helium is investigated. The sphere is levitating inside a superconducting capacitor and oscillates about its equilibrium position. The velocity amplitude and the resonance frequency are measured as a function of driving force and temperature (0.35 K up to 2.2 K). By increasing the driving force we first find a linear regime (laminar flow) which changes abruptly into a nonlinear one (turbulent flow). For temperatures below 0.7 K the linear drag is given by ballistic roton and phonon scattering whereas for temperatures above 1.1 K the hydrodynamic force on the sphere is described by Stoke's solution. In the turbulent regime, above a temperature independent threshold velocity, we find the drag force to be given by turbulence in the superfluid component plus an essentially laminar drag by the normal component.
- Subjects :
- Physics
Mechanical equilibrium
Condensed matter physics
Turbulence
Liquid helium
chemistry.chemical_element
Laminar flow
Condensed Matter Physics
Roton
Electronic, Optical and Magnetic Materials
law.invention
Physics::Fluid Dynamics
chemistry
law
Drag
Electrical and Electronic Engineering
Superfluid helium-4
Helium
Subjects
Details
- ISSN :
- 09214526
- Volume :
- 210
- Database :
- OpenAIRE
- Journal :
- Physica B: Condensed Matter
- Accession number :
- edsair.doi...........24af5896279bc34d88ea1190f1d68654