Form factor for two perpendicular rectangles F1-2 -- Algorithm 3.13

Two finite rectangles of the same length, having one common edge, and at right angles to each other are shown below.

Input

Parameters H & W where
as in diagram

Equation

Note

Angles are expressed in radians

Source

Siegel(1)
References

1. Siegel R and Howell J R Thermal Radiation Heat Transfer (New York: McGraw Hill) (1972)

Erratum

The numbering of surfaces 1 and 2 should be reversed in the diagram


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