Investigations of the Nature of Critical Line Very Close to a Double Critical Point

1991 ◽  
Vol 95 (1) ◽  
pp. 12-14 ◽  
Author(s):  
T. Narayanan ◽  
B. V. Prafulla ◽  
A. Kumar ◽  
E. S. R. Gopal
Keyword(s):  
Critical Point ◽  
Critical Line ◽  
Double Critical Point

New results on the dynamics of Rochelle salt crystals (a system with a "double" critical point)

1986 ◽  
Vol 149 (6) ◽  
pp. 331 ◽  
Author(s):  
A.A. Volkov ◽  
Georgii V. Kozlov ◽  
E.B. Kryukova ◽  
A.A. Sobyanin
Keyword(s):  
Critical Point ◽  
Rochelle Salt ◽  
Salt Crystals ◽  
Double Critical Point

Scaling Near the Critical Point in Mixture

2005 ◽  
Author(s):  
Eldred H. Chimowitz
Keyword(s):  
Critical Point ◽  
Binary Systems ◽  
Critical Line ◽  
Phase Region ◽  
Unique Point ◽  
Pure Fluid ◽  
High Volatility ◽  
Two Phases ◽  
The One ◽  
Dew Line

The critical point of mixtures requires a more intricate set of conditions to hold than those at a pure-fluid critical point. In contrast to the pure-fluid case, in which the critical point occurs at a unique point, mixtures have additional thermodynamic degrees of freedom. They, therefore, possess a critical line which defines a locus of critical points for the mixture. At each point along this locus, the mixture exhibits a critical point with its own composition, temperature, and pressure. In this chapter we investigate the critical behavior of binary mixtures, since higher-order systems do not bring significant new considerations beyond those found in binaries. We deal first with mixtures at finite compositions along the critical locus, followed by consideration of the technologically important case involving dilute mixtures near the solvent’s critical point. Before taking up this discussion, however, we briefly describe some of the main topographic features of the critical line of systems of significant interest: those for which nonvolatile solutes are dissolved in a solvent near its critical point. The critical line divides the P–T plane into two distinctive regions. The area above the line is a one-phase region, while below this line, phase transitions can occur. For example, a mixture of overall composition xc will have a loop associated with it, like the one shown in figure 4.1, which just touches the critical line of the mixture at a unique point. The leg of the curve to the “left” of the critical point is referred to as the bubble line; while that to the right is termed the dew line. Phase equilibrium occurs between two phases at the point where the bubble line at one composition intersects the dew line; this requires two loops to be drawn of the sort shown in figure 4.1. A question naturally arises as to whether or not all binary systems exhibit continuous critical lines like that shown. In particular we are interested in the situation involving a nonvolatile solute dissolved in a supercritical fluid of high volatility.

Behaviour of the curve of critical exponents near and away from a double critical point

1993 ◽  
Vol 181 (6) ◽  
pp. 471-475 ◽  
Author(s):  
B.V. Prafulla ◽  
A. Kumar ◽  
E.S.R. Gopal
Keyword(s):  
Critical Point ◽  
Critical Exponents ◽  
Double Critical Point

Light scattering near a double critical point: Evidence for crossover behavior

1992 ◽  
Vol 45 (2) ◽  
pp. 1266-1269 ◽  
Author(s):  
B. V. Prafulla ◽  
T. Narayanan ◽  
A. Kumar
Keyword(s):  
Light Scattering ◽  
Critical Point ◽  
Crossover Behavior ◽  
Double Critical Point

Experimental studies of solutions with a "double" critical point

1986 ◽  
Vol 29 (6) ◽  
pp. 572-573 ◽  
Author(s):  
Immanuil L Fabelinskiĭ ◽  
S V Krivokhizha ◽  
L L Chaĭkov
Keyword(s):  
Critical Point ◽  
Experimental Studies ◽  
Double Critical Point

Experimental study of the renormalization of β near a double critical point: The 2-butanol and water system

1993 ◽  
Vol 47 (2) ◽  
pp. 630-637 ◽  
Author(s):  
Francisco Monroy ◽  
Arturo G. Casielles ◽  
Arturo G. Aizpiri ◽  
Ramón G. Rubio ◽  
Francisco Ortega
Keyword(s):  
Experimental Study ◽  
Critical Point ◽  
Water System ◽  
Double Critical Point
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