.TAeZoSysPro.HeatTransfer.Functions.FreeConvection.vertical_plate_ASHRAE

Information

The following Churchill and Chu correlation is applicable for a vertical plate in rest environment (no forced convection).
The formula is picked from the ASHRAE guide chapter 3 table 10 equations T10.3

The correlations is given for a Rayleigh number 10⁹ < Ra < 10¹². A other correlation is suitable for 10^-1 < Ra < 10⁹ with the equation T10.2 but the connection at Ra = 10⁹ between the correlation is too discontinuous. Therefore the correlation T10.3 is extended to range 10^-1 < Ra < 10⁹.

Where :

• Nu is the Nusselt number
• Ra is the Rayleigh number
• Pr is the Prandtl number

Interface

function vertical_plate_ASHRAE
  extends Modelica.Icons.Function;
  input Modelica.SIunits.PrandtlNumber Pr;
  input Modelica.SIunits.RayleighNumber Ra;
  output Modelica.SIunits.NusseltNumber Nu;
end vertical_plate_ASHRAE;