Phase equilibrium of methane and nitrogen at low temperatures - Application to Titan

Details Phase equilibrium of methane and nitrogen at low temperatures - Application to Titan Phase equilibrium of methane and nitrogen at low temperatures - Application to Titan

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...91..112k&link_type=abstract

Icarus (ISSN 0019-1035), vol. 91, May 1991, p. 112-124.

Mathematics

Logic

27

Hydrological Cycle, Methane, Nitrogen, Satellite Atmospheres, Titan, Atmospheric Composition, Atmospheric Models, Low Temperature, Two Fluid Models, Two Phase Flow, Voyager 2 Spacecraft

Scientific paper

Since the vapor phase composition of Titan's methane-nitrogen lower atmosphere is uniquely determined as a function of the Gibbs phase rule, these data are presently computed via integration of the Gibbs-Duhem equation. The thermodynamic consistency of published measurements and calculations of the vapor phase composition is then examined, and the saturated mole fraction of gaseous methane is computed as a function of altitude up to the 700-mbar level. The mole fraction is found to lie approximately halfway between that computed from Raoult's law, for a gas in equilibrium with an ideal solution of liquid nitrogen and methane, and that for a gas in equilibrium with pure liquid methane.

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