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Annular rings at the ends of an inscribed cylinder



Function f3d_66(r_c,r_1,r_2,h)  returns the view factor between annular rings at the ends of an inscribed cylinder.

Inputs:
r_c = radius of inner cylinder [m] or [ft]
r_1 = outer radius of annular ring [m] or [ft]
r_2 = radius of outer cylinder [m] or [ft]
h = height of cylinder [m] of [ft]

Example: 
$UnitSystem SI Mass J K Pa Radian
r_c=0.1[m]
r_1=0.3 [m]
r_2=0.2 [m]
h=0.5 [m]
F=f3d_66(r_c,r_1,r_2,h)

{Solution:
F=0.1413}

Reference: 
van Antwerpen, H.J. and Greyvenstein, G.P, "Evaulation of a detailed radiation heat transfer model in a high temperature reactor systems simulations model", Nuclear Engineering and Design, Vol 238, pp. 2985-2994, (2008)