Unformatted text preview: )2
0.5 2(32.2 ft/s2) Ans. 280 lbf/ft2 Ans. z2) is (62.4 lbf/ft3)(4.5 ft) ghf 4.5 ft Moody points out that this computation, even for clean new pipe, can be considered accurate
only to about 10 percent. EXAMPLE 6.7
Oil, with
900 kg/m3 and
0.00001 m2/s, flows at 0.2 m3/s through 500 m of 200mmdiameter castiron pipe. Determine (a) the head loss and (b) the pressure drop if the pipe slopes
down at 10° in the flow direction. Solution
First compute the velocity from the known flow rate
Q
R2 V 0.2 m3/s
(0.1 m)2 6.4 m/s Then the Reynolds number is
Red
From Table 6.1, Vd (6.4 m/s)(0.2 m)
0.00001 m2/s 128,000 0.26 mm for castiron pipe. Then
d 0.26 mm
200 mm 0.0013 3 This example was given by Moody in his 1944 paper [8].  v v 350  eText Main Menu  Textbook Table of Contents  Study Guide 6.5 Three Types of PipeFlow Problems 351 Enter the Moody chart on the right at /d 0.0013 (you will have to interpolate), and move to
the left to intersect with Re 128,000. Read f 0.0225 [from Eq. (6.64) for these values we
could compute...
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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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