Infinitely long opposed parallel plates
Function F2D_1(h, w) returns the view factor between two infinitely long, directly opposed parallel plates of the same finite width.
Inputs:
h is the distance between the plates [m or ft]
w is the width of the plate [m or ft]
Example:
h=1 [m]
w=2 [m]
F=F2D_1(h, w)
{Solution: F=0.618}
Reference: Siegel and Howell, Thermal radiation heat transfer, 4th edition, p.843.