F3D_21

Rectangle to circular disk in a parallel plane

Function f3d_21(a, b, c, r, N) returns the view factor between a rectangle to a circular disk in disk that is in a plane parallel to the rectangle. The view factor is calculated using the Monte-Carlo method:

Inputs:
a = width of the rectangle [ft or m]
b = length of the rectangle [ft or m]
c = distance between planes containing the rectangle and disk [ft or m]
r = radius of the disk [ft or m]
N - number of rays to use to in evaluating the view factor. If N is 0, a default value will be supplied.

Example:
$UnitSystem SI K Pa J deg
a=0.1 [m]
b=0.2 [m]
c=0.2 [m]
r=0.1 [m]
F=f3d_21(a, b, c, r, 0)

{Solution: F=0.184}

Note: Function f3d_21 calls an external procedure named RecttoDisk.FDL which was written in FORTRAN. The FORTRAN program is able to provide the result much more quickly than an EES function.

View Factor Index