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P6.57 John Laufer (NACA Tech. Rep. 1174, 1954) gave velocity
data for 20°C airflow in a smooth 24.7cmdiameter pipe
at Re 5 E5:
u/uCL 1.0 0.997 0.988 0.959 0.908 0.847 0.818 0.771 0.690
r/R 0.0 0.102 0.206 0.412 0.617 0.784 0.846 0.907 0.963 The centerline velocity uCL was 30.5 m/s. Determine
(a) the average velocity by numerical integration and
(b) the wall shear stress from the loglaw approximation.
Compare with the Moody chart and with Eq. (6.59).
P6.58 In Fig. P6.55 assume that the pipe is cast iron with L 550
m, d 7 cm, and Z 100 m. If an 80 percent efficient Textbook Table of Contents  Study Guide 410 Chapter 6 Viscous Flow in Ducts pump is placed at point B, what input power is required to
deliver 160 m3/h of water upward from reservoir 2 to 1?
P6.59 The following data were obtained for flow of 20°C water
at 20 m3/h through a badly corroded 5cmdiameter pipe
which slopes downward at an angle of 8°: p1 420 kPa,
z1 12 m, p2 250 kPa, z2 3 m. Estimate (a) the
roughness ratio of the pipe and (b) the percent change in
h...
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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.
 Spring '08
 Sakar

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