TABLE 12.1 (continued)
View Factors for 2-D Geometries
Geometry
Relation
1
Long cylinder parallel to a large plane
F 12 = 2
area
1
2
s
Long adjacent parallel cylinders of
Let X = 1 + , then
d �
�
equal diameters
1
(X 2 − 1) 1/2 +
F 12 = F 21 =
sin −1 1 − X
1
2
π
X
d
d
s
Concentric spheres
A 1
F 12 = 1; F 21 = A 2
A 2
A 1
F 22 = 1 − F 21 = 1 − A 2
A 1
1
Regular tetrahedron
F 12 = F 13 = F 14 = 3
3
2
4
1
1
Sphere near a large plane area
F 12 = 2
1
2
View Factor
249
continued
View Factors for 2-D Geometries
Geometry
Relation
1
Long cylinder parallel to a large plane
F 12 = 2
area
1
2
s
Long adjacent parallel cylinders of
Let X = 1 + , then
d �
�
equal diameters
1
(X 2 − 1) 1/2 +
F 12 = F 21 =
sin −1 1 − X
1
2
π
X
d
d
s
Concentric spheres
A 1
F 12 = 1; F 21 = A 2
A 2
A 1
F 22 = 1 − F 21 = 1 − A 2
A 1
1
Regular tetrahedron
F 12 = F 13 = F 14 = 3
3
2
4
1
1
Sphere near a large plane area
F 12 = 2
1
2
View Factor
249
continued