Film_Boiling_Flat_Berenson
The function Film_Boiling_Tube_Berenson(Fluid$, T_sat, T_w, D, epsilon) returns the surface heat flux for film boiling of a fluid by means of a heated horizontal tube.
Inputs
Fluid$ - 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].
D - diameter of tube [m] or [ft]
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 Berenson (1961). 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 bar
$VarInfo q``_s units=W/m^2
epsilon=0.05
T_w=ConvertTemp(C,K,350 [C])
T_sat=ConvertTemp(C,K,100 [C])
q``_s=Film_Boiling_Flat_Berenson('Water',T_sat,T_w, epsilon)
{Solution:
q``_s=42337 [W/m^2]}