[Deresix]

Hi guys, I'm new to this community and to OpenFoam. I already obtained a valid result with the heat exchanger tutorial, using the default thermophysicalProperties. My case deal with heat exchange in a pipe between air and co2, separated by alluminium.


I'd like to simulate the same case using 2 liquid species instead of gases. So I need to obtain the polynomial coefficient for the transport models.

The question is, how can I calculate these coefficients? Is there a database online with some examples or algorithms?


So far I've found a code for water in another thread, could you please tell me if it's valid?


Thanks in advance for your help.

thermoType
{
    type            heRhoThermo;
    mixture         pureMixture;
    transport       polynomial;
    thermo          hPolynomial;
    equationOfState icoPolynomial;
    specie          specie;
    energy          sensibleEnthalpy;
}

mixture
{
    specie
    {
        // Water mol weight [g/mol]
        nMoles          1;
        molWeight       18.02; 
    }

    transport
    {
      // *** polynomial
      // mu [Pa.s]
      // kappa [W/m/K]

     muCoeffs<8> (0.477756 -0.00337294 7.80884e-06 -2.59645e-09 -1.64495e-11 2.49614e-14 -1.10764e-17 0);
     kappaCoeffs<8> (1456.92 -10.2864 0.0238197 -7.80437e-06 -5.02923e-08 7.60632e-11 -3.36662e-14 0);
    }

    thermodynamics
    {
      // *** hPolynomial
      // Cp = [J/kg/K]
      Hf  0;
      Sf  0;
      CpCoeffs<8> (-7.56975e08 5.24432e06 -11530.9 1.22828 0.0308639 -4.34995e-05 1.88346e-08 0);
    }

    equationOfState
    {
      // *** icoPolynomial
      // rho = [Kg/m^3]
      rhoCoeffs<8> (4.02745e06 -27520.6 57.8951 0.00610405 -0.000187407 2.52756e-07 -1.08057e-10 0);
    }
}

[Deresix]

If anybody is/will be interested in the solution, I made a water-water heat exchanger and in the thermophysicalProperties I set the polynomials as found in the following website, they work well.



The result is consistent with the theoretical calculation.


Link: https://syeilendrapramuditya.wordpre...ic-properties/