Engineering Board Exam Reviewer · Fluid Mechanics · hard
Oil ( = 0.1 Pa· s) flows in laminar flow at an average velocity of 0.5 m/s through a 20 mm pipe 10 m long. What is the pressure drop? (Hagen–Poiseuille)
- 20.0 kPa
- 160.0 kPa
- 40.0 kPa
- 0.80 kPa
Answer
C. 40.0 kPa
Solution
P = 32 LV/D2 = 32(0.1)(10)(0.5)/(0.022) = 40000 Pa = 40.0 kPa.
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