Correction Length
The correction length can be determined by using the formula: Lc=L+(Ac/P), where Ac is the cross-sectional area and P is the perimeter of the fin at the tip.
- Thin rectangular fin: Ac=Wt, P=2(W+t)?2W, since t ?< W Lc=L+(Ac/P)=L+(Wt/2W)=L+(t/2)
- Cylindrical fin: Ac=(?/4)D2, P= ?D, Lc=L+(Ac/P)=L+(D/4)
- Square fin: Ac=W2, P=4W, Lc=L+(Ac/P)=L+(W2/4W)=L+(W/4)