.TransiEnt.Producer.Gas.BiogasPlant.HeatTransfer.FreeConvection.RayleighNumber

Information

1. Purpose of model

This model calculates the rayleigh number for the heat models of the CSTR

2. Level of detail, physical effects considered, and physical insight

(Description)

3. Limits of validity

(Description)

4. Interfaces

(none)

5. Nomenclature

kinematic viscosity nue

prandtl number Pr

temperature difference dT

linear expansion coefficient beta

6. Governing Equations

Ra :=g*beta*dT*(l^3)*Pr/(nue^2);

7. Remarks for Usage

(none)

8. Validation

(no validation or testing necessary)

9. References

(none)

10. Version History

Model created by Philipp Jahneke (philipp.koziol@tuhh.de), August 2018

Interface

function RayleighNumber
  import g = Modelica.Constants.g_n;
  extends TransiEnt.Basics.Icons.Function;
  input Modelica.Units.SI.Length l;
  input Modelica.Units.SI.LinearExpansionCoefficient beta;
  input Modelica.Units.SI.TemperatureDifference dT;
  input Modelica.Units.SI.PrandtlNumber Pr;
  input Modelica.Units.SI.KinematicViscosity nue;
  output Modelica.Units.SI.RayleighNumber Ra;
end RayleighNumber;