Convection in sup 3 He--superfluid- sup 4 He mixtures: Measurement of the superfluid effects

Journal Article · Tue May 15 04:00:00 EDT 1990 · Physical Review, A (General Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevA.41.5735· OSTI ID:7096934

Metcalfe, G P; Behringer, R P ^[1]

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1. Department of Physics and Center for Nonlinear Studies, Duke University, Durham, North Carolina 27706 (USA)

Dilute superfluid mixtures bridge the Prandtl number range between liquid metals and water: 0.04{lt}{ital N}{sub Pr}{lt}2. The convective equations of motion for superfluid mixtures are the equations for Rayleigh-Benard convection in a normal single-component fluid plus additional superfluid terms. We have measured the latter through their effect on the critical Rayleigh number {ital R}{sub {ital c}}. The corrections can be only a few percent for 1.0{lt}{ital T}{lt}2.0 K, implying an accessible Prandtl-number range near onset of at least 0.04{lt}{ital N}{sub Pr}{lt}1.5.

• OSTI ID: 7096934
• Journal Information: Physical Review, A (General Physics); (USA), Journal Name: Physical Review, A (General Physics); (USA) Vol. 41:10; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONVECTION
DISPERSIONS
ENERGY TRANSFER
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUIDS
HEAT TRANSFER
HELIUM 3
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MASS TRANSFER
MIXTURES
NUCLEI
PRANDTL NUMBER
QUANTUM FLUIDS
STABLE ISOTOPES