On the transport properties of a Van der Waals gas near the critical point

1968 ◽  
Vol 46 (24) ◽  
pp. 2821-2841 ◽  
Author(s):  
Luis de Sobrino
Keyword(s):  
Thermal Conductivity ◽  
Time Dependence ◽  
Critical Point ◽  
Bulk Viscosity ◽  
Shear Viscosity ◽  
Van Der Waals ◽  
Transport Coefficients ◽  
Hydrodynamic Equations ◽  
Van Der Waals Gas ◽  
Critical Fluctuations

A calculation of the critical anomalies of the transport coefficients of a simple fluid based on a microscopic model of a nonequilibrium Van der Waals gas is presented. It is found that, in the gas region, the anomalous bulk viscosity behaves as (T – Tc)−2. Both the anomalous thermal conductivity and shear viscosity behave as In (T – Tc)−1, but the anomaly in the shear viscosity is much smaller than the anomaly in the thermal conductivity. The results appear to indicate that previous calculations, in which the time dependence of the critical fluctuations is obtained from hydrodynamic equations, are not valid.

Transport coefficients of the Lennard–Jones fluid by molecular dynamics

1986 ◽  
Vol 64 (7) ◽  
pp. 773-781 ◽  
Author(s):  
D. M. Heyes
Keyword(s):  
Thermal Conductivity ◽  
Molecular Dynamics ◽  
Bulk Viscosity ◽  
Shear Viscosity ◽  
Diffusion Coefficients ◽  
Transport Coefficients ◽  
The Self ◽  
Nonequilibrium Molecular Dynamics ◽  
Self Diffusion ◽  
Lennard Jones

New nonequilibrium molecular dynamics (MD) calculations of the shear viscosity, bulk viscosity, and thermal conductivity are presented. Together with the self-diffusion coefficients obtained from equilibrium MD, the success of the Dymond–Batchinski expressions for the density and temperature dependence of these transport coefficients is demonstrated.The shear viscosity and self-diffusion coefficients are very good probes for the approach point of the solid-to-liquid phase change. The bulk viscosity and thermal conductivity are less useful in this respect.

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.

Recalculation of the friction constant and transport coefficients of liquid argon from the Rice-Allnatt theory

1971 ◽  
Vol 24 (2) ◽  
pp. 225 ◽  
Author(s):  
AF Collings ◽  
LA Woolf
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Distribution Function ◽  
Shear Viscosity ◽  
Transport Coefficients ◽  
Liquid Argon ◽  
Viscosity Data ◽  
Liquid Region ◽  
Linear Trajectory ◽  
Momentum And Heat Transfer

The linear trajectory approximation of the ?soft? friction constant in the Rice-Allnatt theory of transport has been computed with specific attention to the lower limit of the integral. The results are significantly different from the Palyvos-Davis values for ζS in the dense gas region but agree within 2% in the liquid region. The Rice- Allnatt expressions for the coefficients of shear viscosity and thermal conductivity have been simplified and a correction of a numerical error in the collisional contributions to momentum and heat transfer is made. The coefficients D, η, and λ have been calculated for the corrected ζS and related expressions. No significant change in D is obtained, but a worsening of agreement with experimental viscosities and thermal conductivities occurs. Conversely, a better prediction of the ratio mλ/kη is obtained. More recent viscosity data for liquid argon indicate the theory is less satisfactory than has previously been considered. These results suggest that any improvement of this class of theory can only come through the use of a better representation of the radial distribution function.

scholarly journals Transport near the chiral critical point

2022 ◽  
Vol 258 ◽  
pp. 05008
Author(s):  
Alexander Soloviev
Keyword(s):  
Critical Point ◽  
Order Parameter ◽  
Transport Coefficients ◽  
Mean Field ◽  
Heavy Ion ◽  
Heavy Ion Collision ◽  
Hydrodynamic Equations ◽  
Soft Pion ◽  
Ion Collision

The evolution of a heavy ion collision passes close to the O(4) critical point of QCD, where fluctuations of the order parameter are expected to be enhanced. Using the appropriate stochastic hydrodynamic equations in mean field near the the pseudo-critical point, we compute how these enhanced fluctuations modify the transport coefficients of QCD. Finally, we estimate the expected critical enhancement of soft pion yields, which provides a plausible explanation for the excess seen in experiment relative to ordinary hydrodynamic computations.

Phase separation of binary mixtures induced by soft centrifugal fields

2021 ◽  
Author(s):  
Thomas Zemb ◽  
Rose Rosenberg ◽  
Stjepan Marčelja ◽  
Dirk Haffke ◽  
Jean-François Dufrêche ◽  
...  
Keyword(s):  
Phase Separation ◽  
Critical Point ◽  
Binary Mixtures ◽  
Liquid Mixture ◽  
Model System ◽  
Binary Liquid Mixture ◽  
Miscibility Gap ◽  
Critical Fluctuations ◽  
Binary Liquid

We use the model system ethanol–dodecane to demonstrate that giant critical fluctuations induced by easily accessible weak centrifugal fields as low as 2000g can be observed above the miscibility gap even far from the critical point of a binary liquid mixture.

Maxwell’s relations for a van der Waals gas and a nuclear paramagnetic system

1981 ◽  
Vol 49 (5) ◽  
pp. 435-438
Author(s):  
James Herlihy ◽  
Carol Michelson ◽  
Mercedes Prieto ◽  
Jonathan Ruth ◽  
William A. Barker
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Gas ◽  
Paramagnetic System

scholarly journals Thermal Conductivity through the Quantum Critical Point inYbRh2Si2at Very Low Temperature

2015 ◽  
Vol 115 (4) ◽  
Author(s):  
M. Taupin ◽  
G. Knebel ◽  
T. D. Matsuda ◽  
G. Lapertot ◽  
Y. Machida ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Low Temperature ◽  
Critical Point ◽  
Quantum Critical Point ◽  
Quantum Critical ◽  
Very Low Temperature
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