Radiation View Factors: concentric_cylinders
Radiation view factors (F12) for common geometric configurations — parallel plates, perpendicular surfaces, concentric cylinders/spheres, coaxial disks, enclosures
| geometry class | geometry id | configuration notes | formula expression | geometry description | param 1 name | param 1 value | reciprocity F21 | surface 1 | surface 2 | view factor F12 |
|---|---|---|---|---|---|---|---|---|---|---|
| concentric_cylinders | concentric_cylinders_r0p25 | Inner cylinder is convex so F11=0 and F12=1 (all radiation hits outer cylinder). Reciprocity: 2pi*r1*L*1=2pi*r2*L*F21 → F21=r1/r2=0.25. Outer cylinder self-view: F22=1-r1/r2=0.75. | F12=1; F21=r1/r2 | Two concentric infinitely long cylinders; radius ratio r1/r2=0.25 | r1_over_r2 | 0.25 | 0.25 | Inner cylinder surface (radius r1) | Outer cylinder surface (radius r2) | 1 |
| concentric_cylinders | concentric_cylinders_r0p5 | F12=1; F21=0.50; F22=0.50. | F12=1; F21=r1/r2 | Two concentric infinitely long cylinders; radius ratio r1/r2=0.50 | r1_over_r2 | 0.5 | 0.5 | Inner cylinder surface (radius r1) | Outer cylinder surface (radius r2) | 1 |
| concentric_cylinders | concentric_cylinders_r0p75 | F12=1; F21=0.75; F22=0.25. | F12=1; F21=r1/r2 | Two concentric infinitely long cylinders; radius ratio r1/r2=0.75 | r1_over_r2 | 0.75 | 0.75 | Inner cylinder surface (radius r1) | Outer cylinder surface (radius r2) | 1 |
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