nce.piping

Class PipePressDropLockhartMartinelli

java.lang.Object

nce.piping.PipePressDropLockhartMartinelli

public class PipePressDropLockhartMartinelli
extends java.lang.Object

Evaluation of pressure drop for incompressible two phase flow in a pipe using the Lokhart - Martinelli method. The pressure drop of the liquid phase flowing alone in the pipe shall be first evaluated. The pressure drop of the two phase stream is that of the liquid alone time the two phase multiplier. Implements also Chisholm method for a more reliable void fraction and mix density computation. Chisholm slip ratio is always computed with Lockhart/Martinelli slip ratio whenever evalSlipRatio() is called

Version:

20160219

Author:

Carlo Tegano

Constructor Summary

Constructors

Constructor and Description
PipePressDropLockhartMartinelli()

Method Summary

Methods

Modifier and Type	Method and Description
double	evalLockMartParameter(double vDens, double lDens, double vVisc, double lVisc, double x) Evaluates Lockhart - Martinelli parameter
double	evalSlipRatio(double vDens, double lDens, double vVisc, double lVisc, double x) Evaluates two phase slip ratio, i.e.
double	evalTwoPhaseDensity(double vDens, double lDens, double vVisc, double lVisc, double x) General method for the evaluation of two phase density using fraction.
double	evalTwoPhaseMultiplier() Evaluates two phase multiplier for the field pStream, the vapor liquid stream associated to pipe field
double	evalVoidFrac(double vDens, double lDens, double vVisc, double lVisc, double x) General method for the evaluation of void fraction.
double	getLockMartParameter() Returns computed Lockhart - Martinelli parameter
double	getTwoPhaseMultiplier()
void	init(Pipe pipe) Initialization of two phase pressure drop solver
void	setTwoPhaseMultiplier(double tpMult)
void	transferOutputToPipe()

Methods inherited from class java.lang.Object

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

Constructor Detail

PipePressDropLockhartMartinelli

public PipePressDropLockhartMartinelli()

Method Detail

evalTwoPhaseMultiplier

public double evalTwoPhaseMultiplier()

Evaluates two phase multiplier for the field pStream, the vapor liquid stream associated to pipe field

evalSlipRatio

public double evalSlipRatio(double vDens,
                   double lDens,
                   double vVisc,
                   double lVisc,
                   double x)

Evaluates two phase slip ratio, i.e. the relative velocity between vapor phase and liquid phase

evalLockMartParameter

public double evalLockMartParameter(double vDens,
                           double lDens,
                           double vVisc,
                           double lVisc,
                           double x)

Evaluates Lockhart - Martinelli parameter

init

public void init(Pipe pipe)

Initialization of two phase pressure drop solver

evalTwoPhaseDensity

public double evalTwoPhaseDensity(double vDens,
                         double lDens,
                         double vVisc,
                         double lVisc,
                         double x)

General method for the evaluation of two phase density using fraction. Can be customized by overriding evalSlipRatio()

evalVoidFrac

public double evalVoidFrac(double vDens,
                  double lDens,
                  double vVisc,
                  double lVisc,
                  double x)

General method for the evaluation of void fraction. Can be customized by overriding evalSlipRatio()

transferOutputToPipe

public void transferOutputToPipe()

getTwoPhaseMultiplier

public double getTwoPhaseMultiplier()

setTwoPhaseMultiplier

public void setTwoPhaseMultiplier(double tpMult)

getLockMartParameter

public double getLockMartParameter()

Returns computed Lockhart - Martinelli parameter