A microprocessor chip (10 mm *10 mm square) is to be cooled by an impinging circular air jet that is directed on the chip surface by a 5-mm diameter nozzle, placed at a distance of 10 mm. The electrical activity in the microcircuits of the chip render a uniform surface heat flux condition. For safe operation of the microprocessor, the chip- surface temperature should not exceed 90°C. If air at 20°C flows through the nozzle with a velocity of 10 m/s, and the maximum heat dissipated by the chip is 1.25 W, is this jet- impingement cooling system able to maintain the entire chip surface at a safe operating temperature?
GIVEN
FIND
Whether the jet impinging cooling system be able to maintain the entire chip surface to safe operating
temperature.
Total cooling from the area of 10 mm*10 mm is
Since the heat generated by chip is more than the maximum cooling effect produced by the jet, the
cooling system cannot maintain entire chip at safe operating temperature.
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