Class TBPfractionModel.TwuModel

java.lang.Object

neqsim.thermo.characterization.TBPfractionModel.TBPBaseModel

neqsim.thermo.characterization.TBPfractionModel.TwuModel

All Implemented Interfaces:

Serializable, Cloneable, TBPModelInterface

Enclosing class:

TBPfractionModel

public class TBPfractionModel.TwuModel
extends TBPfractionModel.TBPBaseModel

Twu (1984) property estimation method.

The Twu correlations use n-alkanes as reference compounds and apply perturbation corrections based on specific gravity differences. This approach is particularly accurate for paraffinic petroleum fractions and gas condensates.

The method first calculates properties for a hypothetical n-alkane with the same boiling point, then applies correction factors based on the difference between the actual specific gravity and that of the reference n-alkane.

Key Features:

• Uses n-alkane reference properties
• Applies perturbation corrections for SG differences
• Iteratively solves for equivalent n-alkane molecular weight
• Best for paraffinic/waxy fluids with Kw > 12

Reference: Twu, C.H. (1984). "An Internally Consistent Correlation for Predicting the Critical Properties and Molecular Weights of Petroleum and Coal-Tar Liquids." Fluid Phase Equilibria, 16, 137-150.

Version:

$Id: $Id

Author:

ESOL

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
private static final long	serialVersionUID	Serialization version UID.

Fields inherited from class TBPfractionModel.TBPBaseModel

calcm

Constructor Summary

Constructors

Constructor	Description
TwuModel()

Method Summary

Modifier and Type	Method	Description
double	calcCriticalVolume(double molarMass, double density)	calcCriticalVolume.
double	calcPC(double molarMass, double density)	calcPC.
double	calcRacketZ(SystemInterface thermoSystem, double molarMass, double density)	calcRacketZ.
double	calcTC(double molarMass, double density)	calcTC.
double	calculateTfunc(double MW_alkane, double TB)
double	computeGradient(double MW_alkane, double TB)
double	solveMW(double TB)

Methods inherited from class TBPfractionModel.TBPBaseModel

calcAcentricFactor, calcAcentricFactorKeslerLee, calcCriticalViscosity, calcm, calcParachorParameter, calcTB, calcWatsonCharacterizationFactor, getBoilingPoint, getName, isCalcm, setBoilingPoint

Methods inherited from class Object

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

Field Details

serialVersionUID

private static final long serialVersionUID

Serialization version UID.

See Also:

• Constant Field Values

Constructor Details

TwuModel

public TwuModel()

Method Details

calcTC

public double calcTC(double molarMass,
 double density)

calcTC.

Parameters:

molarMass - a double

density - a double

Returns:

a double

calculateTfunc

public double calculateTfunc(double MW_alkane,
 double TB)

computeGradient

public double computeGradient(double MW_alkane,
 double TB)

solveMW

public double solveMW(double TB)

calcPC

public double calcPC(double molarMass,
 double density)

calcPC.

Parameters:

molarMass - a double

density - a double

Returns:

a double

calcCriticalVolume

public double calcCriticalVolume(double molarMass,
 double density)

calcCriticalVolume.

Specified by:

calcCriticalVolume in interface TBPModelInterface

Overrides:

calcCriticalVolume in class TBPfractionModel.TBPBaseModel

Parameters:

molarMass - a double

density - a double

Returns:

a double

calcRacketZ

public double calcRacketZ(SystemInterface thermoSystem,
 double molarMass,
 double density)

calcRacketZ.

Specified by:

calcRacketZ in interface TBPModelInterface

Overrides:

calcRacketZ in class TBPfractionModel.TBPBaseModel

Parameters:

thermoSystem - a SystemInterface object

molarMass - a double

density - a double

Returns:

a double