F3D_4

Concentric cylinders

Function f3d_4(r_1, r_2, w) calculates a radiation view factor between two concentric cylinders of the same finite length. f3d_4 is the view factor from the smaller of two concentric cylinders (1) to the larger cylinder (2).

Inputs:
r_1- radius of the smaller cylinder   [m or ft]
r_2 - radius of the larger cylinder [m or ft]
w - length of the cylinders [m or ft]

Example:
$UnitSystem SI K Pa J deg
r_1=0.1 [m]
r_2=0.2 [m]
w=0.5 [m]
F=f3d_4(r_1, r_2, w)

{Solution:
F=0.8589 }

Reference: Siegel and Howell, Thermal radiation heat transfer, 4th edition, p.847.

View Factor Index