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Disk to second coaxial disk within a cone



Function f3d_59(e,x,theta) returns the view factor between a circular disk and a second disk within a cone

Inputs:
e = distance from center of cone to disk 1 [m] or [ft]
x = distance from center of cone to disk 2 [m] or [ft]
theta = angle of cone [degree] or [radian]

Example: 
$UnitSystem SI Mass J K Pa Radian
x=0.5 [m] 
e=0.2 [m]
theta=30 [Degree]*convert(degree,rad)
F=f3d_59(e,x,theta)
{F = 0.1627}

Reference: 
Sparrow, E.M. and Jonsson, V.K., 1963b, "Radiation emission characteristics of diffuse conical cavities," J. Opt. Soc. Am., vol. 53, no. 7, pp. 816-821.