Chapt06

00001 reynolds number re vd 0000001 d 0000005

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Unformatted text preview: .000007 0.000005 Smooth 0.00013 0.007 0.000033 0.0016 0.05 0.002 0.046 3.0 2.0 0.26 0.046 0.15 0.12 0.002 0.0015 Smooth 0.04 2.0 0.01 0.5 3 4 56 0.000,01 8 108 ε = 0.000,005 d Uncertainty, % 60 50 30 70 50 50 20 40 50 50 60 60 50 60 40 | v v 349 | e-Text Main Menu | Textbook Table of Contents | Study Guide Chapter 6 Viscous Flow in Ducts EXAMPLE 6.63 Compute the loss of head and pressure drop in 200 ft of horizontal 6-in-diameter asphalted castiron pipe carrying water with a mean velocity of 6 ft/s. Solution One can estimate the Reynolds number of water and air from the Moody chart. Look across the top of the chart to V (ft/s) d (in) 36, and then look directly down to the bottom abscissa to find that Red(water) 2.7 105. The roughness ratio for asphalted cast iron ( 0.0004 ft) is 0.0004 d 0.0008 6 12 Find the line on the right side for /d 0.0008, and follow it to the left until it intersects the vertical line for Re 2.7 105. Read, approximately, f 0.02 [or compute f 0.0197 from Eq. (6.64a)]. Then the head loss is hf f L V2 d 2g (0.02) The pressure drop for a horizontal pipe (z1 p 200 (6 ft/s...
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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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