The top surface of a hot block with L= 8 m is to be cooled by forced air . air velocity and air temperature are 6 m/s and 30 °C , respectively , while surface temperature is T, = 120 °C . Determine the average heat transfer icient and the rate of heat transfer . Take the properties of air at film erature : k = 0.02917 W/m.°C v = 2.486 × 10°m²/s and Pr= 0.7166.

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