Triple Collision Contribution to the Transport Coefficients of a Rigid Sphere Gas

1966 ◽  
Vol 9 (7) ◽  
pp. 1333 ◽  
Author(s):  
J. V. Sengers
Keyword(s):  
Transport Coefficients ◽  
Triple Collision ◽  
Rigid Sphere

scholarly journals An Exact Solution of Boltzmann's Equation for a Rigid Sphere Gas

1968 ◽  
Vol 21 (5) ◽  
pp. 543 ◽  
Author(s):  
PI Brooker ◽  
HS Green
Keyword(s):  
Transport Coefficients ◽  
Velocity Distribution Function ◽  
Zero Order ◽  
Rigid Sphere ◽  
Stream Velocity ◽  
Approximation Techniques ◽  
The Third ◽  
Boltzmann's Equation ◽  
Good Agreement ◽  
Boltzmann’S Equation

The second approximation to Boltzmann's equation, in Chapman and Cowling's form, is solved exactly for a rigid sphere gas by using appropriate transformations to reduce the integral equation to a differential equation, which is solved numerically. The values of the transport coefficients, calculated directly from this solution for the velocity distribution function, are in good agreement with those obtained from the usual approximation techniques. A solution for part of the third approximation, with a term of zero order in V, the velocity of a molecule relative to the stream velocity, is also obtained analytically.

TRANSPORT COEFFICIENTS IN F-S THEORY

1974 ◽  
Author(s):  
D. Bolmont ◽  
J. Salmon ◽  
M. Valton
Keyword(s):  
Transport Coefficients

scholarly journals Transport Coefficients of Hyperonic Neutron Star Cores

Universe ◽  
2021 ◽  
Vol 7 (6) ◽  
pp. 203
Author(s):  
Peter Shternin ◽  
Isaac Vidaña
Keyword(s):  
Thermal Conductivity ◽  
Neutron Star ◽  
Shear Viscosity ◽  
Transport Coefficients ◽  
Dense Matter ◽  
Baryon Number ◽  
Nucleon Nucleon ◽  
Total Thermal Conductivity ◽  
Nucleon Force ◽  
Density Region

We consider transport properties of the hypernuclear matter in neutron star cores. In particular, we calculate the thermal conductivity, the shear viscosity, and the momentum transfer rates for npΣ−Λeμ composition of dense matter in β–equilibrium for baryon number densities in the range 0.1–1 fm−3. The calculations are based on baryon interactions treated within the framework of the non-relativistic Brueckner-Hartree-Fock theory. Bare nucleon-nucleon (NN) interactions are described by the Argonne v18 phenomenological potential supplemented with the Urbana IX three-nucleon force. Nucleon-hyperon (NY) and hyperon-hyperon (YY) interactions are based on the NSC97e and NSC97a models of the Nijmegen group. We find that the baryon contribution to transport coefficients is dominated by the neutron one as in the case of neutron star cores containing only nucleons. In particular, we find that neutrons dominate the total thermal conductivity over the whole range of densities explored and that, due to the onset of Σ− which leads to the deleptonization of the neutron star core, they dominate also the shear viscosity in the high density region, in contrast with the pure nucleonic case where the lepton contribution is always the dominant one.

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