Chapt06

Estimate a the reynolds number b the total pressure

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Unformatted text preview: /s, flows at 400 gal/min through a 6-in asphalted cast-iron pipe. The pipe is 0.5 mi long and slopes upward at 8° in the flow direction. Compute the head loss in ft and the pressure change. Textbook Table of Contents | Study Guide Problems 409 P6.46 Kerosine at 20°C is pumped at 0.15 m3/s through 20 km of 16-cm-diameter cast-iron horizontal pipe. Compute the input power in kW required if the pumps are 85 percent efficient. P6.47 Derive Eq. (6.59), showing all steps. The constant 1.33 dates back to Prandtl’s work in 1935 and may change slightly to 1.29 in your analysis. P6.48 Show that if Eq. (6.49) is accurate, the position in a turbulent pipe flow where local velocity u equals average velocity V occurs exactly at r 0.777R, independent of the Reynolds number. P6.49 The tank-pipe system of Fig. P6.49 is to deliver at least 11 m3/h of water at 20°C to the reservoir. What is the maximum roughness height allowable for the pipe? 4m Water at 20°C 30 m Q Smooth pipe: d = 5 cm Open jet p1 80 m 10 m 60 m P6.52 P6.54 In Fig. P6.52 suppose that the fluid is carb...
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