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.

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