Engineering Board Exam Reviewer · Fluid Mechanics · hard
Water flows at 100 L/s upward through a pipe that reduces from 300 mm to 150 mm. The smaller section is 3 m higher. If the pressure at the larger section is 250 kPa, what is the pressure at the smaller section? (neglect losses)
- 234.99 kPa
- 220.57 kPa
- 235.58 kPa
- 205.56 kPa
Answer
D. 205.56 kPa
Solution
V1 = 1.415 m/s, V2 = 5.659 m/s. P2 = P1 + (V12 - V22)/2 - z = 250 + (2.001 - 32.022)/2 - 9.81(3) = 205.56 kPa.
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