Transport properties of fluid mixtures in the critical region

Journal Article · Tue Nov 01 04:00:00 EST 1994 · International Journal of Thermophysics

DOI:https://doi.org/10.1007/BF01458832· OSTI ID:50772

Luettmer-Strathmann, J; Sengers, J V ^[1]

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1. Univ. of Maryland, College Park, MD (United States)

Transport properties of fluid mixtures exhibit anomalous behavior near the vapor-liquid critical line. These anomalies are a result of long-range fluctuations in the system in the vicinity of a critical point. We use mode-coupling theory to describe the critical enhancements of the thermal conductivity, the viscosity, the mutual diffusivity, and the thermal-diffusion coefficients of binary mixtures. The resulting expressions not only are valid in the asymptotic critical region but also describe the crossover to regular behavior far away from a critical point. The crossover functions depend on the thermodynamic properties of the mixtures, background values of all transport coefficients, and two concentration-dependent cutoff wave numbers. We compare the proposed crossover model with experimental thermal-conductivity data for mixtures of carbon dioxide and ethane in the critical region and final good agreement between theory and experiment.

• Sponsoring Organization: USDOE
• DOE Contract Number: FG05-88ER13902
• OSTI ID: 50772
• Report Number(s): CONF-940633--
• Journal Information: International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 6 Vol. 15; ISSN 0195-928X; ISSN IJTHDY
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
66 PHYSICS
BINARY MIXTURES
CARBON DIOXIDE
ETHANE
EXPERIMENTAL DATA
THERMAL CONDUCTIVITY
THERMAL DIFFUSION
THERMAL DIFFUSIVITY
VISCOSITY