History-dependent nonlinear dissipation in superfluid /sup 3/He-A

Journal Article · Sun May 01 04:00:00 EDT 1983 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00683553· OSTI ID:5909226

Gay, R; Bagley, M; Hook, J R; Sandiford, D J; Hall, H E

We have studied nonlinear dissipation in oscillatory flow of /sup 3/He-A through 49-..mu..m- and 17-..mu..m-wide channels by means of torsion pendulum experiments at about 50 Hz. The observed effects are strongly history dependent; the dissipation at a given measuring amplitude is strongly increased if the sample is cooled through T/sub c/ while oscillating at large amplitude. Once a highly dissipative state has been created it does not noticeably decay below T/sub c/, though a more dissipative state can be created below T/sub c/ by a period of sufficiently large-amplitude oscillation. The results are described semiquantitatively by a model based on the idea of superflow collapse by motion of the l vector, with consequent orbital dissipation. The history dependence is introduced into this model by postulating the existence of surface singularities in the l texture, the density of which is determined by the previous history of the helium.

• Research Organization: Physics Department, University of Manchester, Manchester, England
• OSTI ID: 5909226
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 51:3; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CAPILLARY FLOW
DAMPING
DATA
ENERGY
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FLUID FLOW
FREE ENERGY
FREQUENCY RANGE
HELIUM 3
HELIUM 3 A
HELIUM ISOTOPES
HZ RANGE
INFORMATION
ISOTOPES
LIGHT NUCLEI
MEDIUM PRESSURE
NONLINEAR PROBLEMS
NUCLEI
NUMERICAL DATA
OSCILLATIONS
PHYSICAL PROPERTIES
RELAXATION TIME
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
ULTRALOW TEMPERATURE
VARIATIONAL METHODS