Sphere to sphere Small to very large Case View factor Plot From a sphere of radius to a much R1 larger sphere of radius at a distance R2 H between centres (it must (e.g. for H=R2, F12=1/2) be but does not H>R2, depend on with R1), hH/R2. Concentric spheres Case View factor Plot F12=1 F21=r2 Between concentric F22=1r2 spheres of radii and R1 with R2>R1, rR1/R2<1. (e.g. for r=1/2, F12=1, F21=1/4, F22=3/4) Sphere to concentric hemisphere Case View factor Plot From a sphere of radius F12=1/2, F13=1/2, F21=1/R2, to a larger concentric R1 F23=1F21F22, hemisphere of radius with with (e.g. for R2>R1, RR2/R1>1. R=2, F12=1/2, F21=1/4, Let the enclosure be ‘3’. F13=1/2, F23=0.34,F22=0.41) Hemispheres Concentric hemispheres Case View factor Plot , , , , , , From a hemisphere of radius to a larger with Limit for (=1/2): R1 R→∞ F12=3/4, concentric hemisphere of F13=1/4 radius with R2>R1, Let the (e.g. for RR2/R1>1. R=2, F12=0.86, F21=0.21, closing planar annulus be F13=0.14, F31=0.09, F32=0.91, surface 3. F23=0.34, F22=0.41) Small hemisphere frontal to large sphere Case View factor Plot From a small hemisphere (one face) to a large frontal sphere of radius R at a distance between (e.g. for HR H=R, F12=3/4) centres, with hH/R. Hemisphere to planar surfaces Case View factor Plot
Sphere to sphere Small to very large Case View factor Plot From a sphere of radius R1 to a much larger sphere of radius R2 at a distance H between centres (it must be H>R2, but does not depend on R1), with hH/R2. (e.g. for H=R2, F12=1/2) Concentric spheres Case View factor Plot Between concentric spheres of radii R1 and R2>R1, with rR1/R2<1. F12=1 F21=r2 F22=1r2 (e.g. for r=1/2, F12=1, F21=1/4, F22=3/4) Sphere to concentric hemisphere Case View factor Plot From a sphere of radius R1 to a larger concentric hemisphere of radius R2>R1, with RR2/R1>1. Let the enclosure be ‘3’. F12=1/2, F13=1/2, F21=1/R2, F23=1F21F22, with (e.g. for R=2, F12=1/2, F21=1/4, F13=1/2, F23=0.34,F22=0.41) Hemispheres Concentric hemispheres Case View factor Plot From a hemisphere of radius R1 to a larger concentric hemisphere of radius R2>R1, with RR2/R1>1. Let the closing planar annulus be surface 3. , , , , , , with Limit for R→∞ (=1/2): F12=3/4, F13=1/4 (e.g. for R=2, F12=0.86, F21=0.21, F13=0.14, F31=0.09, F32=0.91, F23=0.34, F22=0.41) Small hemisphere frontal to large sphere Case View factor Plot From a small hemisphere (one face) to a large frontal sphere of radius R at a distance HR between centres, with hH/R. (e.g. for H=R, F12=3/4) Hemisphere to planar surfaces Case View factor Plot
Radiation%20View%20factors.docx