Chapt06

What fluid in table a5 is the likely suspect p655

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Unformatted text preview: ead loss if the pipe were smooth and the flow rate the same. P6.60 J. Nikuradse in 1932 suggested that smooth-wall turbulent pipe flow could be approximated by a power-law profile u uCL P6.62 P6.63 P6.64 1/N y R where y is distance from the wall and N 6 to 9. Find the best value of N which fits Laufer’s data in Prob. 6.57. Then use your formula to estimate the pipe volume flow, and compare with the measured value of 45 ft3/s. A straight 10-cm commercial-steel pipe is 1 km long and is laid on a constant slope of 5°. Water at 20°C flows downward, due to gravity only. Estimate the flow rate in m3/h. What happens if the pipe length is 2 km? The Moody chart, Fig. 6.13, is best for finding head loss (or p) when Q, V, d, and L are known. It is awkward for the second type of problem, finding Q when hf or p is known (see Example 6.9). Prepare a modified Moody chart whose abscissa is independent of Q and V, using /d as a parameter, from which one can immediately read the ordinate to find (dimensionless)...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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