CE336_HW#2_OCT04_2023

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California Polytechnic State University, San Luis Obispo *

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336

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Mechanical Engineering

Date

Dec 6, 2023

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pdf

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3

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1 Water Resources Engineering (CE336) Home Work Set 2: Pipe Hydraulics Assigned 10/04/2023 Due 10/ 11/2023 (Ind. 100 + Gr. 100) Submit problems #1 through #4 individually. But feel free to discuss with others. Submit problems #5 & #6 as a group. State any additional and reasonable assumptions you make to solve the problems. Problem #1 (20 points) A 50 ft long smooth plastic pipe of 1.5 inch diameter connects two pressurized tanks of water as shown in the drawing below. The pump has a power input of 241 ft·lb/sec with perfect efficiency. The tanks are at the same elevation. What is the minor loss coefficient of the valve? Ignore entrance and exit losses. Problem #2 (20 points) Compute the discharge in each line and the pressure at the two junction nodes. f = 0.02 for all pipes. Ignore minor losses. Pipe Data Pipe No. Length (m) Diameter (mm) 1 1,829 457 2 3,658 381 3 2,439 457 Node 1 Node 2
2 Node Data Node Elevation (m) WSEL A (water surface elevation at reservoir A) 304.9 ELEV 1 (elevation at node 1) 289.6 ELEV 2 (elevation at node 2) 282.0 WSEL B (water surface elevation at reservoir B ) 274.4 Problem #3 (20 points) A second identical pipe was installed parallel to pipe 2 in Problem #2 connecting nodes 1 and 2. Compute the discharge in each pipe and the pressure at the two junction nodes. Use f = 0.02 for all pipes. Neglect minor losses. Problem #4 (40 points) Hint: You are allowed to assume fully turbulent flow.
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