Engineering Board Exam Reviewer · Fluid Mechanics · hard
Two pipes are connected in series: pipe 1 is 200 mm in diameter and 300 m long; pipe 2 is 100 mm and 150 m long. Both have f = 0.02. For a flow of 40 L/s, what is the total friction head loss? (neglect minor losses)
- 39.66 m
- 15.67 m
- 2.48 m
- 42.14 m
Answer
D. 42.14 m
Solution
V1 = 1.273 m/s, V2 = 5.093 m/s. h1 = 0.02(300/0.2)(V12/2g) = 2.479 m; h2 = 0.02(150/0.1)(V22/2g) = 39.661 m. Total = 42.14 m.
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