Radiation configuration factors for obliquely oriented finite length circular cylinders

Closed-form approximate expressions for configuration factors for arbitrarily oriented cylinders are developed based on numerical results obtained by applying a general computer program to the category of problems. Numerical computations are presented for a variety of cylinder spacings, lengths and angular orientations. For each of two distinct types of 90 deg orientations, it is shown that the configuration factors for a wide range of spacings and lengths can be scaled to yield a single curve under most conditions. The cylinder lengths, which yield a maximum configuration factor for a given spacing are determined, and the accuracy of the approximate expressions is good for both theta and phi rotations.