Non-asymptotic critical behavior of the transport properties of fluids

Journal Article · Wed Nov 01 04:00:00 EST 1995 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.470718· OSTI ID:118404

Luettmer-Strathmann, J ^[1]; Sengers, J V ^[2]; Olchowy, G A ^[1]

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1. Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742 (United States)
2. Department of Chemical Engineering and Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742 (United States)

We extend the application of the mode-coupling theory for the dynamics of critical fluctuations in fluids into the non-asymptotic critical region. An approximate solution of the mode-coupling equations yields a set of representative equations for the thermal conductivity and the viscosity of one-component fluids which incorporates the crossover from asymptotic singular behavior near the critical point to the regular behavior of these transport properties far away from the critical point. The equations for the critical enhancements of the thermal conductivity and the viscosity depend on the background transport properties of the fluid, the equilibrium thermodynamic properties of the fluid, and one fluid-dependent wave-number cutoff {ital q}{sub D}, which is indicative of the crossover length scale. We compare our crossover model with experimental data for the thermal diffusivity, the thermal conductivity, and the viscosity of carbon dioxide and ethane. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• DOE Contract Number: FG02-95ER14509
• OSTI ID: 118404
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 17 Vol. 103; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CRITICALITY
EQUILIBRIUM
FLUCTUATIONS
FLUIDS
THERMAL CONDUCTIVITY
THERMAL DIFFUSIVITY
THERMODYNAMIC PROPERTIES
TRANSPORT
VISCOSITY