Class NeqSimSpanWagner

java.lang.Object
neqsim.thermo.util.spanwagner.NeqSimSpanWagner
public final class NeqSimSpanWagner extends Object
Utility class implementing the Span–Wagner reference equation of state for carbon dioxide. All properties are returned on a molar basis in SI units.
Author:
esol

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    private static class 
    NeqSimSpanWagner.Derivs
    Holder for Helmholtz energy derivatives.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private static final double[]
    D
     
    private static final double[]
    GBETA
     
    private static final double[]
    GD
     
    private static final double[]
    GEPS
     
    private static final double[]
    GETA
     
    private static final double[]
    GGAMMA
     
    private static final double[]
    GN
     
    private static final double[]
    GT
     
    private static final double[]
    L
     
    private static final double
    LEAD_A1
     
    private static final double
    LEAD_A2
     
    private static final double
    LOGTAU_A
     
    private static final double[]
    N
     
    private static final double[]
    N0
     
    private static final double
    OFFSET_A1
     
    private static final double
    OFFSET_A2
     
    private static final double
    R
     
    private static final double
    RHOC
     
    private static final double[]
    T
     
    private static final double[]
    T0
     
    private static final double
    TC
     

  • Constructor Summary

    Constructors
    Modifier
    Constructor
    Description
    private
    NeqSimSpanWagner()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    private static void
    alpha0(double delta, double tau, NeqSimSpanWagner.Derivs d)
    Evaluate ideal-gas contribution and derivatives.
    private static void
    alphar(double delta, double tau, NeqSimSpanWagner.Derivs d)
    Evaluate residual contribution and derivatives (power + gaussian terms).
    private static double
    density(double tau, double pressure, PhaseType type)
    Solve for reduced density delta given temperature and pressure.
    static double[]
    getProperties(double temperature, double pressure, PhaseType type)
    Compute thermodynamic properties for given temperature and pressure.

    Methods inherited from class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

    • R

      private static final double R
      See Also:

    • TC

      private static final double TC
      See Also:

    • RHOC

      private static final double RHOC
      See Also:

    • LEAD_A1

      private static final double LEAD_A1
      See Also:

    • LEAD_A2

      private static final double LEAD_A2
      See Also:

    • LOGTAU_A

      private static final double LOGTAU_A
      See Also:

    • OFFSET_A1

      private static final double OFFSET_A1
      See Also:

    • OFFSET_A2

      private static final double OFFSET_A2
      See Also:

    • N0

      private static final double[] N0

    • T0

      private static final double[] T0

    • N

      private static final double[] N

    • D

      private static final double[] D

    • T

      private static final double[] T

    • L

      private static final double[] L

    • GN

      private static final double[] GN

    • GD

      private static final double[] GD

    • GT

      private static final double[] GT

    • GBETA

      private static final double[] GBETA

    • GGAMMA

      private static final double[] GGAMMA

    • GEPS

      private static final double[] GEPS

    • GETA

      private static final double[] GETA

  • Constructor Details

    • NeqSimSpanWagner

      private NeqSimSpanWagner()

  • Method Details

    • alpha0

      private static void alpha0(double delta, double tau, NeqSimSpanWagner.Derivs d)
      Evaluate ideal-gas contribution and derivatives.
      Parameters:
      delta - reduced density (rho / rhoc)
      tau - inverse reduced temperature (Tc / T)
      d - holder for derivative terms that will be populated

    • alphar

      private static void alphar(double delta, double tau, NeqSimSpanWagner.Derivs d)
      Evaluate residual contribution and derivatives (power + gaussian terms).
      Parameters:
      delta - reduced density (rho / rhoc)
      tau - inverse reduced temperature (Tc / T)
      d - holder for derivative terms that will be populated

    • density

      private static double density(double tau, double pressure, PhaseType type)
      Solve for reduced density delta given temperature and pressure.
      Parameters:
      tau - inverse reduced temperature (Tc / T)
      pressure - system pressure in Pascal
      type - phase type used for the initial guess
      Returns:
      reduced density

    • getProperties

      public static double[] getProperties(double temperature, double pressure, PhaseType type)
      Compute thermodynamic properties for given temperature and pressure.
      Parameters:
      temperature - Kelvin
      pressure - Pascal
      type - phase type for which properties are calculated
      Returns:
      array [rho, Z, h, s, cp, cv, u, g, w]