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An Equation of State for the Thermodynamic Properties of Dimethyl Ether
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10.1063/1.3582533
Jiangtao Wu (吴江涛)1,a), Yong Zhou (周永)1 and Eric W. Lemmon2
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Affiliations:
1 State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an Shaanxi 710049, People’s Republic of China
2 Thermophysical Properties Division, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA
a) Author to whom correspondence should be addressed. Electronic mail: jtwu@mail.xjtu.edu.cn; Fax: 86-29-82668789.
J. Phys. Chem. Ref. Data 40, 023104 (2011)
/content/aip/journal/jpcrd/40/2/10.1063/1.3582533
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## Figures

FIG. 1.

Reported critical temperatures of dimethyl ether as a function of the year published.

FIG. 2.

Reported critical densities of dimethyl ether as a function of the year published.

FIG. 3.

Reported critical pressures of dimethyl ether as a function of the year published.

FIG. 4.

Comparisons of ideal gas heat capacities calculated with Eq. (7) to experimental and theoretical data as a function of temperature.

FIG. 5.

Comparisons of vapor pressures calculated with the equation of state to experimental data as a function of temperature (the range of the -axis is ). The solid line corresponds to values calculated from the ancillary equation, Eq. (1). The dashed line corresponds to values calculated from the equation of state of Ihmels and Lemmon.12

FIG. 6.

Comparisons of vapor pressures calculated with the equation of state to experimental data as a function of temperature (the range of the -axis is ). The line corresponds to values calculated from the ancillary equation, Eq. (1). The dashed line corresponds to values calculated from the equation of state of Ihmels and Lemmon.12

FIG. 7.

Comparisons of saturated liquid densities calculated with the equation of state to experimental data as a function of temperature. The line corresponds to values calculated from the ancillary equation, Eq. (2). The dashed line corresponds to values calculated from the equation of state of Ihmels and Lemmon.12

FIG. 8.

Comparisons of saturated vapor densities calculated with the equation of state to experimental data as a function of temperature. The line corresponds to values calculated from the ancillary equation, Eq. (3). The dashed line corresponds to values calculated from the equation of state of Ihmels and Lemmon.12

FIG. 9.

Experimetal data as a function of temperature and pressure.

FIG. 10.

Comparisons of densities calculated with the equation of state to experimental data as a function of pressure. The dashed line corresponds to values calculated from the equation of state of Ihmels and Lemmon.12

FIG. 11.

Comparison of second virial coefficients B calculated with the equation of state to experimental data as a function of temperature. The dashed line corresponds to values calculated from the equation of state of Ihmels and Lemmon.12

FIG. 12.

Comparison of third virial coefficients C calculated with the equation of state to experimental data as a function of temperature. The dashed line corresponds to values calculated from the equation of state of Ihmels and Lemmon.12

FIG. 13.

Calculations of along isotherms versus density in the vapor-phase region and two-phase region. Isotherms are shown at temperatures of 220, 240, 260, 280, 300, 400.378, 500, 600, 700, 800, 900, and .

FIG. 14.

Experimental caloric data as a function of temperature and pressure.

FIG. 15.

Comparisons of saturation heat capacities calculated with the equation of state to experimental data as a function of temperature. The dashed line corresponds to values calculated from the equation of state of Ihmels and Lemmon.12

FIG. 16.

Comparisons of two-phase isochoric heat capacities calculated with the equation of state to experimental data as a function of temperature. The dashed line corresponds to values calculated from the equation of state of Ihmels and Lemmon.12

FIG. 17.

Comparisons of isobaric heat capacities calculated with the equation of state to experimental data as a function of temperature.

FIG. 18.

Comparisons of isochoric heat capacities calculated with the equation of state to experimental data as a function of temperature.

FIG. 19.

Isochoric heat capacity versus temperature. Isobars are shown at pressures of 0, 0.1, 0.5, 1, 2, 3, 4, 5, 6, 8, 10, 20, 50, 100, 200, 500, 1000, 2000, and . The dashed line and the dotted line are shown at the triple-point temperature and the critical-point temperature , respectively.

FIG. 20.

Isobaric heat capacity versus temperature. Isobars are shown at pressures of 0, 0.1, 0.5, 1, 2, 3, 4, 5, 6, 8, 10, 20, 50, 100, 200, 500, 1000, 2000, and . The dashed line and the dotted line are shown at the triple-point temperature and the critical-point temperature , respectively.

FIG. 21.

Sound speed w versus temperature. Isobars are shown at pressures of 0, 0.1, 0.5, 1, 2, 3, 4, 5, 6, 8, 10, 20, 50, 100, 200, 500, 1000, 2000, and . The dashed line and the dotted line are shown at the triple-point temperature and the critical-point temperature , respectively.

FIG. 22.

Isobaric behavior of the equation of state for dimethyl ether. Isobars are shown at pressures of 0.1, 0.2, 0.5, 1, 2, , 10, 20, 50, 100, 200, 500, and . The rectilinear diameter is shown in the diagram.

FIG. 23.

Isothermal behavior of the equation of state at extreme conditions of temperature and pressure. Isotherms are shown at temperatures of , 150, 200, 250, 300, 350, , 500, 1000, 5000, 10 000, 50 000, 100 000, 500 000, and .

FIG. 24.

Characteristic (ideal) curves of the equation of state as a function of reduced temperature and reduced pressure .

## Tables

TABLE 1.

Physical constants and characteristic properties of dimethyl ether

TABLE 2.

Published critical parameters of dimethyl ether

TABLE 3.

Summary of vapor-pressure data for dimethyl ether

TABLE 4.

Summary of saturated-liquid density data for dimethyl ether

TABLE 5.

Summary of saturated-vapor density data for dimethyl ether

TABLE 6.

Summary of and virial-coefficient data for dimethyl ether

TABLE 7.

Summary of caloric data for dimethyl ether

TABLE 8.

The coefficients and exponents of the equation of state

/content/aip/journal/jpcrd/40/2/10.1063/1.3582533
2011-06-08
2014-04-25

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