Fins-2 (cont.)
In some situations, it might be necessary to include the convective heat transfer at the tip. However, one would like to avoid using the long equation as described in case A, fins table. The alternative is to use case B instead and accounts for the convective heat transfer at the tip by extending the fin length L to LC=L+(t/2).
Then apply the adiabatic condition at the tip of the extended fin as shown above.