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Two tubes are available for a particular application: (1) 4.0 cm diameter circular tube and (2) 4.0 cm square tube. Air at 1 atm and 27 °C is blown across the tubes with a velocity of 20 m/s. The tube wall temperature is maintained at 50 °C in both cases.
a. Calculate the heat transfer for both geometries if the length of each tube is 1 meter.
b. Which tube should you recommend to your boss and why?
air is expanded in a polytropic process with n 1.5 from 2 mpa and 300 degrees celcius to 80 kpa in a piston-cylinder
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