Hot air flowing through a metal pipe of 20 mm diameter is cooled at a constant rate per unit length of pipe. At a partic

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Hot Air Flowing Through A Metal Pipe Of 20 Mm Diameter Is Cooled At A Constant Rate Per Unit Length Of Pipe At A Partic 1 (82.19 KiB) Viewed 80 times

Hot air flowing through a metal pipe of 20 mm diameter is cooled at a constant rate per unit length of pipe. At a particular section (a), the air velocity in the centre of the pipe is found to be 2 m/ s and the wall temperature, as measured by a thermocouple on the inner surface of the pipe , is 250 °C. At a sertion b), situated Im downstream from the section (a), the wall temperature is found to be 200°C. Estimate the mean air temperature at section (b).