Transport properties of /sup 3/He-/sup 4/He mixtures near the superfluid transition

Journal Article · Sun Jan 01 04:00:00 EST 1984 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681476· OSTI ID:6587224

Gestrich, D; Walsworth, R; Meyer, H

We report measurements of the temperature, density, and concentration gradients in /sup 3/He-/sup 4/He mixtures, induced by a vertical heat flux. The flat horizontal cell included two superposed capacitors and the density was determined by means of the dielectric constant method. The experiments were carried out on mixtures with mole fractions X/sub 3/ = 0.37, 0.15, and 0.05 at saturated vapor pressure, with special emphasis on the region near the superfluid transition. Our measurements under steady-state conditions give conductivity kappa, the thermal diffusion ratio k/sub T/, and the coefficient of thermal expansion. We describe the singular behavior of these quantities in the neighborhood of T/sub lambda/(X). In the superfluid phase, we test with fair success a relation by Khalatnikov between grad X/grad T and several static properties. From the relaxation times needed to attain steady-state conditions, and in combination with measured static and transport properties, we obtain in the normal phase the mass diffusion D, which diverges strongly as T/sub lambda/ is approached. In the superfluid phase, we test successfully a scaled relation that results from the solution of Khalatnikov's hydrodynamic equations. From our data the dispersion relations for scattered light are calculated: GAMMA/sub 0//q/sup 2/ in both the normal and the superfluid phases and GAMMA/sub 2//q/sup 2/ in the normal phase.

• Research Organization: Department of Physics, Duke University, Durham, North Carolina
• OSTI ID: 6587224
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 54:1; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIFFUSION
DISPERSION RELATIONS
DISPERSIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPANSION
FLUIDS
HELIUM 3
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LAMBDA POINT
LIGHT NUCLEI
MASS TRANSFER
MIXTURES
NUCLEI
PHYSICAL PROPERTIES
QUANTUM FLUIDS
RELAXATION TIME
SCALING LAWS
STABLE ISOTOPES
SUPERFLUIDITY
TEMPERATURE GRADIENTS
THERMAL CONDUCTIVITY
THERMAL DIFFUSION
THERMAL EXPANSION
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE