Film_Boiling_Tube_Breen
The function Film_Boiling_Flat_Berenson(Fluid$, T_sat, T_w, epsilon) returns the surface heat flux for film boiling of a fluid by means of a heated horizontal flat surface.
Inputs
Fluid$ - string constant or variable representing a fluid/vapor in the EES data base.
T_sat - the saturation temperature of the boiling liquid in [C], [K], [F], or [R].
T_s - the temperature of the heated surface in [C], [K], [F], or [R].
epsilon - the emittance of the surface
Output
The surface heat flux due to film boiling in [W/m^2] or [Btu/hr-ft^2]
Notes:
This procedure is responsible for determining the property data of the specified fluid . It uses the correlation developed by Breen and Westwater (1962). The heat transfer coefficient associated with the surface heat flux that is calculated includes contributions from convection and radiation weighted such that:
where h_bar_conv is the heat transfer coefficient resulting from convection and h_bar_rad is the heat transfer coefficient resulting from radiation.
Example:
$UnitSystem SI K J Pa
$VarInfo q``_s units=W/m^2
epsilon=0.5
T_w=ConvertTemp(C,K,350 [C])
T_sat=ConvertTemp(C,K,100 [C])
D = 0.5 [cm]*Convert(cm,m)
q``_s=Film_Boiling_Tube_Breen('Water', T_sat, T_w, D, epsilon)
{Solution:
q``_s=43984 [W/m^2]}