Vapour-liquid coexistence curve of some alternative refrigerants in the critical region

1997 ◽  
Vol 29 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Junzo Yata ◽  
Masatomo Hori ◽  
Ken Kohno ◽  
Tatsuo Minamiyama
Keyword(s):  
Critical Region ◽  
Coexistence Curve ◽  
Alternative Refrigerants

Cation mobility in gaseous, critical, and liquid deuterated methanes

1988 ◽  
Vol 66 (8) ◽  
pp. 1872-1876 ◽  
Author(s):  
M. Antonio Floriano ◽  
Norman Gee ◽  
Gordon R. Freeman
Keyword(s):  
Ion Mobility ◽  
Critical Region ◽  
Coexistence Curve ◽  
Number Density ◽  
Experimental Conditions ◽  
Gas Density ◽  
Cation Mobility ◽  
Temperature Coefficients ◽  
Arrhenius Temperature ◽  
Field Strengths

Cation mobilities µ have been measured in the deuterated methanes CHxD4−x (x = 0–4) at field strengths E/n < 4 × 10−21 V m2/molecule, 92 ≤ T/K ≤ 598 and 0.025 ≤ n/1026 molecules m−3 ≤ 171. The mobility in the equilibrium fluids was the same at a given number density n for all five methanes. In the liquid the mobility decreased as the critical region was approached. Changes in nµ in the nonsaturated gases reflected changes in clustering, which was favored at lower T or higher n. The Arrhenius temperature coefficients of ion mobilities at constant gas density near the vapor/liquid coexistence curve nearly equalled those of electron mobilities at similar experimental conditions. The ion mobility in the saturated gas was determined mainly by density and in the liquid by the viscosity.

ON THE LIQUID–VAPOR COEXISTENCE CURVE OF XENON IN THE REGION OF THE CRITICAL TEMPERATURE

1952 ◽  
Vol 30 (5) ◽  
pp. 422-437 ◽  
Author(s):  
M. A. Weinberger ◽  
W. G. Schneider
Keyword(s):  
Critical Temperature ◽  
Critical Region ◽  
Van Der Waals ◽  
Coexistence Curve ◽  
Packing Materials ◽  
Critical Data ◽  
Van Der Waals Theory ◽  
Liquid Vapor

The liquid–vapor coexistence curves of very pure xenon have been determined in bombs of vertical lengths 1.2 cm. and 19 cm. The longer bomb yielded a flat-topped coexistence curve, the shorter a more rounded curve. The classical van der Waals theory is capable of explaining a large portion of the flat top if effects of gravity are taken into account. Details of the theoretical variation of the width of the flat top with vertical bomb lengths are given. The critical data obtained for xenon are ρc = 1.105 gm./cc., Tc = 16.590 ±.001 °C. The danger of contamination of gases in the critical region on contact with gasket or packing materials is stressed.

Effect of pressure on the coexistence curve of methanol+n-heptane in the near critical region

1993 ◽  
Vol 173 (3) ◽  
pp. 457-466 ◽  
Author(s):  
Arturo G. Aizpiri ◽  
Francisco Monroy ◽  
Arturo G. Casielles ◽  
Ramon G. Rubio ◽  
Francisco Ortega
Keyword(s):  
Critical Region ◽  
Coexistence Curve ◽  
Effect Of Pressure

Coexistence curve ofC2H4in the critical region

1987 ◽  
Vol 36 (12) ◽  
pp. 5677-5682 ◽  
Author(s):  
John R. de Bruyn ◽  
David A. Balzarini
Keyword(s):  
Critical Region ◽  
Coexistence Curve
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