Effects of critical fluctuations on the thermodynamic properties of fluids and fluid mixtures

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Bulletin of the American Physical Society

OSTI ID:243773

Jin, G X; Tang, S; Sengers, J V

In fluids, critical fluctuations not only induce singular thermodynamic behavior asymptotically close to the critical point, but they also have a significant influence on the thermodynamic properties in a large region around the critical point. Based on an approximate solution of the renormalization-group equation, the authors present a procedure to obtain a renormalized Helmholtz free-energy density for one-component fluids that reproduces the universal singular behavior near the critical point, and crosses over to mean-field behavior far away from the critical point. This procedure is then extended to include binary fluid mixtures near the vapor-liquid critical line. A comparison with experimental data for carbon dioxide, ethane and their mixtures shows that the theory describes the thermodynamic properties of both one-component fluids and binary fluid mixtures in a very large range around the critical point.

• DOE Contract Number: FG05-88ER13902
• OSTI ID: 243773
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 38; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BINARY MIXTURES
CRITICAL PRESSURE
CRITICAL TEMPERATURE
FLUCTUATIONS
FLUIDS
PHASE TRANSFORMATIONS
THERMODYNAMIC PROPERTIES