hi how to calculate the HTC
 

hi experts in tutorial natural heat transfer between solid and fluid. i want to find heat transfer coefficients of fin surface. but shows the large variation like 2000 to 0. because it takes base of the fin is 2000 w/m2k. but how is it possible. then i cant find the actual variation of HTC in fin. because it shows the htc variation 0 to 2000 by 100 step. fin syrface htc is nearly 10. then how i find the correct answer thanks