TEMPERATURE DEPENDENCE OF THE THERMAL DIFFUSION FACTOR FOR HELIUM, NEON, AND ARGON

Journal Article · Sun Oct 01 04:00:00 EDT 1961 · Physics of Fluids (U.S.)

DOI:https://doi.org/10.1063/1.1706199· OSTI ID:4824162

Saxena, S C; Kelley, J G; Watson, W W

The isotopic thermal diffusion factor for He, Ne, and Ar was measured by an all-glass "swing separator" with its lower tube ends at 78 and 195 deg K, extending the temperature range of earlier data. These new data, along with the older ones, were interpreted in terms of the L-J (12-6) and modified exp-six potentials. Various equilibrium and nonequilibrium properties are calculated and compared with the experimental data. An equation was developed which relates the thermal diffusion factor with the absolute values of the viscosity, diffusion coefficient, and their derivatives and is essentially independent of the nature of intermolecular force. The thermal diffusion values are consistent with the available experimental data of viscosity and diffusion, through the use of the proposed relation, but more accurate data on diffusion as a function of temperature are needed for a precise evaluation. Approximate calculations are given to estimate the quantum corrections for He at 78 and 195 deg K. (auth)

• Research Organization: Atomic Energy Establishment, Trombay, India
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-032631
• OSTI ID: 4824162
• Journal Information: Physics of Fluids (U.S.), Journal Name: Physics of Fluids (U.S.) Vol. Vol: 4; ISSN PFLDA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ARGON
BINDING ENERGY
DIFFUSION
ELECTRIC POTENTIAL
EQUATIONS
HELIUM
ISOTOPE EFFECTS
ISOTOPE SEPARATION
LOW TEMPERATURE
MOLECULES
NEON
NUMERICALS
PHYSICS
QUANTUM MECHANICS
TEMPERATURE
VISCOSITY