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  • 1
    Electronic Resource
    Electronic Resource
    A thermodynamic property formulation for air. II. Pressure and density estimation functions for the dew and bubble lines (1990)
    Springer
    International journal of thermophysics 11 (1990), S. 179-188 
    Details
    ISSN: 1572-9567
    Keywords: air ; bubble point ; dew point ; phase equilibrium ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract As a companion to a new correlation for the thermodynamic properties of air in single-phase states, new values for the properties on the dew and bubble lines have been calculated. Phase equilibrium properties for air at low and moderate pressures were predicted from accurate equations of state for argon, nitrogen, and oxygen using extended corresponding-states (ECS) methods. For pressures near the critical pressure, property values were calculated using a modified Leung-Griffiths model for mixtures of argon, nitrogen, and oxygen. Available experimental data and newly predicted values have been used in developing new correlating functions for estimating density and pressure on the dew and bubble lines of air. Estimates of the accuracies of these correlations based upon comparisons of calculated properties to data from other sources are also included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503869
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of the critical liquid volume fraction to rectilinear-diameter methods for prediction of the critical density of ethylene and oxygen (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 513-524 
    Details
    ISSN: 1572-9567
    Keywords: coexistence densities ; critical density ; ethylene ; liquid volume fraction ; oxygen ; rectilinear diameter ; phase equilibria ; pure fluids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comparison of the prediction of the critical density for ethylene and oxygen from available coexistence density values using three methods is presented. The conventional rectilinear diameter, the rectilinear diameter with an additional term to represent the postulated curvature near the critical point, and the critical liquid volume fraction were each utilized to predict critical density values for ethylene and oxygen. The correlating functions and fitted constants for the three techniques are given for different ranges of saturation density values. The accepted saturation lines for ethylene and oxygen calculated from new correlations of thermodynamic properties for these fluids were used in this study. The critical density of ethylene was predicted using coexistence density values from 220 to 230 K and from 220 to 282.34 K. Similarly, the critical density for oxygen was predicted using coexistence densities from 100 to 116 K, from 100 to 154.004 K, and from 100 to 154.571 K. Values of the critical density predicted using the three methods are compared with the accepted critical density values for these fluids. The ability of the three methods to predict accurate critical density values using saturation densities at temperatures removed from the critical point is assessed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502386
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of binary mixture vapor-liquid critical densities from coexisting density data (1987)
    Springer
    International journal of thermophysics 8 (1987), S. 695-715 
    Details
    ISSN: 1572-9567
    Keywords: coexistence densities ; critical density ; liquid volume fraction ; mixtures ; nitrogen-methane ; phase equilibria ; rectilinear diameter ; two-phase isochores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two-phase vapor-liquid equilibrium (VLE) isochores for binary mixtures are defined as the thermodynamic paths along which the overall density and composition are fixed. Data along such isochores are generated from a modified Leung-Griffiths model fit to experimental data for the binary system nitrogen-methane. The behavior of the liquid volume fraction along these isochores is found to be similar to that for pure fluids. Rectilinear diameters for varying overall densities (fixed composition) are seen to be nearly coincident. Straight-line diameters and the critical liquid volume fraction method are utilized to predict critical densities using data near and removed from the critical point. Both methods give acceptable results but the critical liquid volume fraction method is more accurate. A critical literature review of the need for binary mixture critical densities is presented and a proposed experimental procedure is given for the determination of mixture critical densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500789
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Measurements of the viscosities of saturated and compressed liquid normal butane and isobutane (1985)
    Springer
    International journal of thermophysics 6 (1985), S. 43-62 
    Details
    ISSN: 1572-9567
    Keywords: compressed liquid ; density dependence ; fluidities ; isobutane ; normal butane ; saturated liquid ; shear viscosity coefficients ; torsional piezoelectric crystal viscometer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The shear viscosity coefficients of saturated and compressed liquid normal butane and isobutane have been measured with the torsional piezoelectric crystal method at temperatures beween 115 and 300 K and at pressures to 30 MPa. The measurements have been correlated with a modified Hildebrand equation. The experimental error is estimated to be smaller than 3%. The measurements of normal butane and isobutane have been compared with a global extended corresponding states model and with each other. Differences between measured and calculated viscosities are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00505791
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Vapor-liquid equilibria of ternary mixtures in the critical region on paths of constant temperature and overall composition (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 473-481 
    Details
    ISSN: 1572-9567
    Keywords: critical region ; ethane ; Leung-GriOiths model ; n-butane ; n-pentane ; phase rule ; ternary mixtures ; vapor-liquid equilibrium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-pressure vapor liquid equilibrium (VLE) data for the ternary mixture ethane +n-butane +n-pentane due to Thodos and co-workers have been correlated by a ternary version of the modified Leung Grifiths model. Data were taken along paths of constant temperature and approximately constant overall composition, and a separate test was made for such constancy. Seventeen different specified overall compositions at four dilTerent temperatures were correlated. In general, agreement between the correlation and data is very good, particularly for those curves that satisfy the test for constant overall composition. The ternary model has been constructed from correlations of each of the three constituent binaries without any further adjustable parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01441913
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    Paper (German National Licenses)
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