Consider atmospheric air at 25 °C and a velocity of 25 m/s flowing over BOTH surfaces of a 1-m-long flat plate that is maintained at 125 °C. The width of the plate (into paper direction) is 1 m.Determine the rate of heat transfer if the critical Reynolds number is 5 × 105.

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Answered: Consider atmospheric air at 25 °C and a…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.38P

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Example 2: The local atmospheric pressure in Denver, Colorado (elevation 1610 m), is 83.4 kPa. Air at this pressure is 20°C flows with a velocity of 8 m/s over a 1.5 m  6 m flat plate whose temperature is 140°C (Figure). Determine the rate of heat transfer from the plate if the air flows parallel to the (a) 6-m-long side and (b) the 1.5-m side.
Air at 1atm, 35 degree celcius (ρ = 1.145 kg/m3 and μ = 1.895 x 10-5 kg/m.s) and average velocity of 7 m/s, enters a 10m section of a circular pipe with diameter of 20cm. Neglecting the entrance effects, determine the fan power needed to overcome the pressure losses in the duct. Use friction factor f= 0.020336

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