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The air at 20 ° C flows at a speed of 5 m / s on...

The air at 20 ° C flows at a speed of 5 m / s on a plate of 4 m length, 3 m width and a temperature of 80 ° C. What is the heat transfer rate of the surface from the laminar flow zone? (For air, take k = 0.02735 W / m. ° C, Pr = 0.7228, v = 1.798x105 m² / s.)

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