Chapt06

1 h a 5 cm b 3 cm 2 q v water l 30 m e614 solution

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Unformatted text preview: al steel surfaces. From the Moody chart, read f 0.0232. Then, from Eq. (1) above, h (1.99 m/s)2 1 2(9.81 m/s2) For better accuracy, take Deff Dh/ has been read from Table 6.3 for b/a ness ratio are Reeff From the Moody chart, read f h 3 5 30 m 0.04 m 0.0232 3.71 m Crude ans. 0.670Dh 2.68 cm, where the correction factor 0.670 0.6. Then the corrected Reynolds number and rough- VDeff 52,300 Deff 0.00172 0.0257. Then the improved computation for reservoir height is (1.99 m/s)2 1 2(9.81 m/s2) 0.0257 30 m 0.04 m 4.09 m Better ans. The uncorrected hydraulic-diameter estimate is about 9 percent low. Note that we do not replace Dh by Deff in the ratio L/Dh in Eq. (1) since this is implicit in the definition of friction factor. Other Noncircular Cross Sections Table 6.4 Laminar Friction Constants f Re for Rectangular and Triangular Ducts Rectangular b Isosceles triangle 2 a fReDh , deg 96.00 89.91 84.68 82.34 78.81 72.93 65.47 62.19 57.89 56.91 0 10 20 30 40 50 60 70 80 90 | v v b/a 0.0 0.05 0.1 0.125 0.167 0.25 0...
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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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