(c) A 50 mm-diameter propeller was installed in a 150 mm-diameter water pipe and the propeller speed was measured for a range of water discharge in the pipe. The water had a density and dynamic viscosity of 1000 kg/m3 and 0.00112 Ns/m2 respectively. The measured results were as follows:
Q (litres/s):12 28 45 63 95 120 160 180
N (rps): 5 10 15 20 30 40 60 80
Plot the dependence of propeller coefficient against propeller Reynolds number. A geometrically similar propeller with diameter 100 mm was installed in a 300 mm-diameter pipe conveying oil with density 800 kg/m3 and dynamic viscosity 0.007 Ns/m2 . Estimate the discharge in the oil pipe for measured propeller speeds of 40 rps and 90 rps.
