The Viscosity and Thermal Conductivity of Normal Hydrogen in the Limit of Zero Density

1986 ◽  
Vol 15 (4) ◽  
pp. 1315-1322 ◽  
Author(s):  
M. J. Assael ◽  
S. Mixafendi ◽  
W. A. Wakeham
Keyword(s):  
Thermal Conductivity ◽  
Zero Density ◽  
Normal Hydrogen

PREDICTION OF THERMAL CONDUCTIVITY OF R32, R125, R134a, R143a AND R152a AT ZERO DENSITY VIA SEMI-EMPIRICALLY-BASED ASSESSMENT

2011 ◽  
Vol 19 (01) ◽  
pp. 45-56 ◽  
Author(s):  
BEHZAD HAGHIGHI ◽  
FATEMEH HEIDARI ◽  
BEHNOUD HAGHIGHI ◽  
MOHAMMAD MEHDI PAPARI ◽  
BEHRAD HAGHIGHI
Keyword(s):  
Thermal Conductivity ◽  
Potential Energy Function ◽  
Model Potential ◽  
Initial Model ◽  
Gaseous State ◽  
Efficient Procedure ◽  
Lennard Jones ◽  
Zero Density ◽  
Extended Corresponding States ◽  
Inversion Procedure

The robust and efficient procedure is presented to calculate the transport properties, especially thermal conductivity coefficients, for gaseous state of difluoromethane (R32), pentafluoroethane (R125), 1, 1, 1, 2 tetrafluoroethane (R134a), 1, 1, 1 trifluoroethane (R143a) and 1, 1 difluoroethane (R152a) at zero density. The McLinden et al.'s1 approach of the extended corresponding states has been used for calculating the contribution of molecular degree of freedom to the thermal conductivity of these refrigerants. The Lennard–Jones 12-6 (LJ 12-6) potential energy function is used as the initial model potential required by the technique. The interaction potential energies from the inversion procedure reproduce the thermal conductivity coefficients commensurate to the best measurements.

Ortho and Paratritium

1963 ◽  
Vol 18 (2) ◽  
pp. 197-202 ◽  
Author(s):  
Edwin W. Albers ◽  
Paul Harteck ◽  
Robert R. Reeves
Keyword(s):  
Thermal Conductivity ◽  
Liquid Helium ◽  
Half Life ◽  
Solid Phase ◽  
Life Time ◽  
Liquid Helium Temperature ◽  
Helium Temperature ◽  
Small Glass ◽  
Adsorbed Phase ◽  
Normal Hydrogen

KLAUS CLUSIUS zum 60. Geburtstag gewidmetNormal tritium was partially and totally converted to paratritium by adsorption on charcoal at liquid neon and liquid helium temperature. The experimentation was performed with 300 millicuries of tritium sealed in a small glass apparatus where the transformation could be performed and the paratritium concentration measured by thermal conductivity. In the adsorbed phase the conversion half-life time was one minute, about 24 times faster than normal hydrogen. In the solid phase the conversion half-life was in the order of 15 minutes. Both processes were much faster than expected.

The viscosity and thermal conductivity of ethane in the limit of zero density

1991 ◽  
Vol 12 (6) ◽  
pp. 999-1012 ◽  
Author(s):  
S. Hendl ◽  
J. Millat ◽  
V. Vesovic ◽  
E. Vogel ◽  
W. A. Wakeham
Keyword(s):  
Thermal Conductivity ◽  
Zero Density

The Thermal Conductivity of Methane and Tetrafluoromethane in the Limit of Zero Density

1990 ◽  
Vol 19 (5) ◽  
pp. 1137-1147 ◽  
Author(s):  
M. J. Assel ◽  
J. Millat ◽  
V. Vesovic ◽  
W. A. Wakeham
Keyword(s):  
Thermal Conductivity ◽  
Zero Density
Sign in / Sign up

Export Citation Format

Share Document