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Question: air under standard atmospheric sa conditions flows through a pipe...

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Air under standard atmospheric (SA) conditions flows through a pipe of 4.0 mm diameter with an internal roughness, k0.0015 mm. If the average velocity of the air were 50 m/s, the flow would normally be turbulent. However, if precautions are taken to eliminate disturbances to the flow (smooth entrance, dust-free air, no tube vibrations) it is possible to maintain laminar flow up to a Reynolds number, Re 2 x 104 Determine the pressure drop through a 100 mm length of tube if the flow is laminar. [10 marks] Repeat the calculation for turbulent flow [10 marks] Comment on whether the flow through the 100 mm length of pipe might be considered incompressible. What about a 2 m length of pipe? [5 marks] Data at SA: Atmospheric pressure 101 kPa, Air density p 1.23 kg/m3 viscosity H-1.8 x 10-5 kgm1s-1

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