Chapt06

Solution one can estimate the reynolds number of

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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 200-mmdiameter cast-iron 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 cast-iron 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 | e-Text Main Menu | Textbook Table of Contents | Study Guide 6.5 Three Types of Pipe-Flow 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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