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ENH: liquidMixturePropertues - contribution by dkxls

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- replaced TMax() function by pvInvert(X)
- added pseudo triple point temperature function
This commit is contained in:
andy
2013-08-09 12:34:10 +01:00
parent 40102eb67b
commit 7280498f1d
2 changed files with 59 additions and 5 deletions
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56
src/thermophysicalModels/properties/liquidMixtureProperties/liquidMixtureProperties/liquidMixtureProperties.C
View File

@ -103,12 +103,62 @@ Foam::scalar Foam::liquidMixtureProperties::Tc(const scalarField& x) const
}
Foam::scalar Foam::liquidMixtureProperties::TMax(const scalar p) const
Foam::scalar Foam::liquidMixtureProperties::Tpt(const scalarField& x) const
{
scalar T = -GREAT;
scalar Tpt = 0.0;
forAll(properties_, i)
{
T = max(T, properties_[i].pvInvert(p));
Tpt += x[i]*properties_[i].Tt();
}
return Tpt;
}
Foam::scalar Foam::liquidMixtureProperties::pvInvert
(
const scalar p,
const scalarField& x
) const
{
// Set upper and lower bounds
scalar Thi = Tc(x);
scalar Tlo = Tpt(x);
// Check for critical and solid phase conditions
if (p >= pv(p, Thi, x))
{
return Thi;
}
else if (p < pv(p, Tlo, x))
{
WarningIn
(
"Foam::scalar Foam::liquidMixtureProperties::pvInvert"
"("
" const scalar,"
" const scalarField&"
") const"
) << "Pressure below triple point pressure: "
<< "p = " << p << " < Pt = " << pv(p, Tlo, x) << nl << endl;
return -1;
}
// Set initial guess
scalar T = (Thi + Tlo)*0.5;
while ((Thi - Tlo) > 1.0e-4)
{
if ((pv(p, T, x) - p) <= 0.0)
{
Tlo = T;
}
else
{
Thi = T;
}
T = (Thi + Tlo)*0.5;
}
return T;

8
src/thermophysicalModels/properties/liquidMixtureProperties/liquidMixtureProperties/liquidMixtureProperties.H
View File

@ -141,8 +141,9 @@ public:
//- Calculate the critical temperature of mixture
scalar Tc(const scalarField& x) const;
//- Calculate the maximum temperature of mixture at given pressure
scalar TMax(const scalar p) const;
//- Invert the vapour pressure relationship to retrieve the boiling
// temperature of the mixture as a function of pressure
scalar pvInvert(const scalar p, const scalarField& x) const;
//- Return pseudocritical temperature according to Kay's rule
scalar Tpc(const scalarField& x) const;
@ -150,6 +151,9 @@ public:
//- Return pseudocritical pressure (modified Prausnitz and Gunn)
scalar Ppc(const scalarField& x) const;
//- Return pseudo triple point temperature (mole averaged formulation)
scalar Tpt(const scalarField& x) const;
//- Return mixture accentric factor
scalar omega(const scalarField& x) const;