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Heat Transfer - Engineering

Q1:

The average heat transfer co-efficient over the entire length of the plate (ha) and the local heat transfer co-efficient (hL), in case of heat transfer over a flat plate in lminar zone is related as

A ha = 0.8hL

B ha = 2hL

C ha = hL

D ha = 5hL

ANS:B - ha = 2hL

In the laminar zone of heat transfer over a flat plate, the local heat transfer coefficient (hL) varies along the length of the plate. However, the average heat transfer coefficient (ha) over the entire length of the plate can be related to the local heat transfer coefficient (hL) by the following relationship: ha = 0.664 * hL So, the correct statement would be: ha = 0.664hL