Question: A ( 1 5 - mathrm { cm } times 1 5 - mathrm { cm } ) circuit board

\ (15 - \

mathrm

{

} \

times

15 - \

mathrm

{

} \)

circuit board dissipating

20

W of power uniformly is cooled by air, which approaches the circuit board at

\ (20^{\

circ

} \

mathrm

{

} \)

with a velocity of

\ (6 \

mathrm

{

} / \

mathrm

{

} \) .

Disregarding any heat transfer from the back surface of the board, determine the surface temperature of the electronic components at the end of the board. Assume the flow to be turbulent since the electronic components are expected to act as turbulators. For air properties evaluations, assume a film temperature of

\ (35^{\

circ

} \

mathrm

{

} \) .

Is this a good assumption?

$A \ ( 1 5 - \ mathrm { cm } \ times 1 5 - \$

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