Radiation View Factors: coaxial_disks

Radiation view factors (F12) for common geometric configurations — parallel plates, perpendicular surfaces, concentric cylinders/spheres, coaxial disks, enclosures

Mechanical Engineeringgeometry_class: coaxial_disks3 rows
geometry classgeometry idconfiguration notesformula expressiongeometry descriptionparam 1 nameparam 1 valuesurface 1surface 2view factor F12
coaxial_diskscoaxial_disks_equal_Rh0p5R/h=0.5 → h/R=2. S=(2)^2+2=6. F12=(6-sqrt(36-4))/2=(6-sqrt(32))/2=(6-5.6569)/2=0.1716. Formula from Incropera Table 13.2.S=(h/R)^2+2; F12=(S-sqrt(S^2-4))/2Two coaxial parallel disks of equal radius R; R/h=0.5 (h is separation)R_over_h0.5Disk 1 (radius R)Disk 2 (radius R)0.1716
coaxial_diskscoaxial_disks_equal_Rh1p0R/h=1.0 → h/R=1. S=1+2=3. F12=(3-sqrt(9-4))/2=(3-sqrt(5))/2=(3-2.2361)/2=0.3820.S=(h/R)^2+2; F12=(S-sqrt(S^2-4))/2Two coaxial parallel disks of equal radius R; R/h=1.0R_over_h1Disk 1 (radius R)Disk 2 (radius R)0.382
coaxial_diskscoaxial_disks_equal_Rh2p0R/h=2.0 → h/R=0.5. S=2.25. F12=(2.25-sqrt(2.25^2-4))/2=(2.25-sqrt(1.0625))/2=(2.25-1.03078)/2=0.6096.S=(h/R)^2+2; F12=(S-sqrt(S^2-4))/2Two coaxial parallel disks of equal radius R; R/h=2.0R_over_h2Disk 1 (radius R)Disk 2 (radius R)0.6096

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