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2. Air at atmospheric pressure and a temperature of 300C flows steadily with a velocity of 10 m/s over a flat plate of length

2. Air at atmospheric pressure and a temperature of 300C flows steadily with a velocity of 10 m/s over a flat plate of length 0.5 m. Estimate the cooling rate per unit width of the plate needed to maintain a surface temperature of 27C. (30p) Properties: Air: v=30.84x10-6 m2/s, k=36.4x10-3 W/mK, Pr=0.687 counterflow concentric tube heat exchanger is used to cool the lubricating oil for a

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