The top of your countertop waffle maker gets really hot, so you want to try two things to help it cool off: first, to point a fan at it, and second, to add rectangular fins to it in addition to using the fan. The top surface of the waffle maker is a flat square that spans L = 200 mm on each side.
The fan you’re using generates a flow velocity of U∞ = 7.5 m/s, and the ambient air temperature is T∞ = 295 K. The waffle maker’s surface temperature is Ts = 360 K.
For the air, use the tabulated values...
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fin
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heat
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sink
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transfer
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문제
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