Question:-
For laminar flow over a flat plate, the local heat transfer coefficient ‘hx ‘varies as x-1/2where x is the distance from the leading edge (x=0) of the plate. The ratio of the average coefficient ‘ha’ between the leading edge and some location ‘A’ at x = x on the plate to the local transfer coefficient ‘hx’ at A is
Option (A)
1
Option (B)
2
Option(C)
4
Option(D)
8
Correct Option:
(B)
Question Solution:
[hav/hlocal]at x=x = {(1/x)∫x0 x-1/2dx}/{x-1/2} = 2
question-answer-faq-6074