Engineering Board Exam Reviewer · Fluid Mechanics · hard
Two pipes of the same length and friction factor are connected in parallel: one 300 mm and one 200 mm in diameter. What is the ratio of the flow in the larger pipe to that in the smaller pipe?
- 2.756
- 2.250
- 1.500
- 7.594
Answer
A. 2.756
Solution
Equal head loss: hf Q2/D5 Q D2.5. Q1/Q2 = (300/200)2.5 = 2.756.
More Fluid Mechanics questions
- For fully developed laminar flow in a circular pipe, the maximum velocity at the center is:
- Water flows at 3 m/s in a 100 mm pipe that suddenly enlarges to 200 mm. What is the head loss due to the sudden enlargement?
- What is the minor loss at a sharp-edged pipe entrance (K = 0.5) where the velocity is 3 m/s?
- Using the Blasius equation (f = 0.316/Re0.25), what is the friction factor for smooth-pipe flow at Re = 50,000?
- For laminar flow with a Reynolds number of 1000, what is the Darcy friction factor?
- Water flows at 50 L/s through a 250 mm pipe 1 km long. If f = 0.025, what is the head loss?
- Water flows at 2 m/s through a 200 mm pipe 500 m long. If f = 0.02, what is the head loss due to friction?
- What is the maximum velocity of water ( = 1 × 10-6 m2/s) in a 25 mm pipe for the flow to remain laminar (Re = 2000)?
- Oil ( = 900 kg/m3, = 0.1 Pa· s) flows at 0.5 m/s in a 50 mm pipe. What is the Reynolds number, and what is the flow regime?
- Water ( = 1 × 10-6 m2/s) flows at 1.5 m/s in a 100 mm diameter pipe. What is the Reynolds number?