A circuit board with a dense distribution of
Chapter 6, Problem 6.51(choose chapter or problem)
A circuit board with a dense distribution of integratedcircuits (ICs) and dimensions of 120 mm?120 mm ona side is cooled by the parallel flow of atmospheric airwith a velocity of 2 m/s.From wind tunnel tests under the same flow con-ditions, the average frictional shear stress on the upper surface is determined to be 0.0625 N/m2. What is theallowable power dissipation from the upper surface ofthe board if the average surface temperature of the ICsmust not exceed the ambient air temperature by morethan 25C? Evaluate the thermophysical properties ofair at 300 K.
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