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Element on longitudinal strip on inside of right circular cylinder to annual space at one end between concentric cylinders



FDiff_15(r1, r2, z) provides the view factor from a differential element (surface 1) on a longitudinal strip on the inside of right circular cylinder with radius r2 to the annular space at one end (surface 2) formed between concentric cylinders with radii r1 and r2.  

Inputs:
r1   is the radius of the smaller concentric cylinder [m or ft]
r2  is the radius of the larger concentric cylinder cylinder [m or ft]
z  is the height of the element above the base  [m or ft]

Example:  
$UnitSystem SI K Pa J deg
r1=0.2 [m]
r2=0.3 [m]
z=0.3 [m]
F=fdiff_15(r1, r2, z)

{Solution: 
F =0.2966}


Reference: Howell, http://www.me.utexas.edu/~howell/sectionb/B-58.html 

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