Thermodynamic properties of methane in the critical region

Critical and Crossover Phenomena in Fluids and Fluid Mixtures

“…An extension of the crossover theory by retaining 6 terms in the Landau expansion has been developed [4,13,60], referred to as six-term crossover Landau model. The six-term crossover Landau model (with some minor variations) has been used to represent the thermodynamic properties of a variety of fluids in an appreciable range of temperatures and densities around the critical point including steam [4,67], carbon dioxide [4,68], ethane [4,68,69], methane [69,70], argon [71], sulfur hexafluoride [72], and a number of refrigerants like RI34a [73], R152a [74], and ammonia [75].…”

Crossover equation of state for the thermodynamic properties of mixtures of methane and ethane in the critical region

“…Jin et al [26] have applied an earlier simpler version of our crossover equation of state to methane to be used in conjunction with a global equation of state developed for methane by Setzmann and Wagner [27]. However, in order to develop a theoretically based equation of state for mixtures in the critical region, we want to start from a single crossover equation of state for the two pure-fluid components applicable in as large a range of temperatures and densities as possible.…”

“…Hence we rerepresent the thermodynamic properties of methane in terms of the crossover equation of state formulated in this paper. For the critical parameters of methane we continued to use the values obtained by Kleinrahm and Wagner [28] and adopted by Setzmann and Wagner [27] and by Jin et al [26] T~ ~1 = 190.564 K, PIcll = 4.5992 MPa, ~'"l*l _-10.122 mol. L -t…”

“…With estimated errors in pressure, temperature and density as small ere=5 x 10 -5 MPa, at= lx 10 -3 K, and ap=0.15 kg.m -3 [26], we find that the equation represents the experimental data with a reduced chisquare of 3.57 in a range of temperatures and densities bounded by r + 1.2A~ 2 < 0.5, r > -0.07 (26) This range of temperatures and densities is shown in Fig. 1.…”

Rarefied Natural Gas Transport

“…Then you can use the formulas and the properties to present further properties of other hydrocarbons, such as ethane, propane, butane, etc., to calculate further physical properties of natural gases in most common operating states, and to conduct further analyses of theoretical and experimental researches. Various tests have been conducted to determine  , k , p c , and  of methane at different working pressures or temperatures (Mann & Dickins 1931;Johnston & McCloskey 1940;Clarke & Smith, 1969;Jansoone et al, 1970;Vennix et al, 1970;Younglove, 1974;Gammon & Douslin, 1976;Kerley, 1980;Kurumov et al, 1988;Friend et al, 1989;Jin et al, 1992;Pátek & Klomfar, 2002;Hurly et al, 2003;Schley et al, 2004;Viswanathan, 2007). Except for density, temperature was found to be a relatively important factor in the gaseous state.…”