Flow Measurement

1
Flow Measurement

• Pitot tube
• V 2g ( P1-P2)/?1/2
• Orifice meter
• V 2g ( h1-h2)/(1 Co) ½
• h (P/ ?) Z

2
Homework

• Water flows through a 2-inch diameter pipe at 200
  lbm/min. Its temperature is 60oF. Find the
  velocity of water flow.

3
Homework

• Water from a pipe line is diverted into weigh
  tank for exactly 9 minutes. Tank weight
  increases 4765 lbf. Water temperature is 60oF.

4
Homework

• Steady flow of gas through a pipe whose diameter
  decreases from 1.0 meter to 60cm. The gas
  density decreases from 2 kg/m3 to 1.6 kg/m3.
  The entering velocity is 25 m/s. What is exit
  velocity?

5
Reynolds Transport Theorem

• General energy equation expands Bernoulli
  Equation

6
Example

• System in figure carries water at rate of 0.5
  m3/s through a 50 cm diameter pipe. Elevations
  are z2 40 m and z2 30 m. P1 70 kPa gage. .
  P2 must be 350 kPa. The head loss through the
  system is 3 m water. What power must be supplied
  to the pump kW HP ?

7
References

• Images examples
• Mechanics of Fluids, 3rd Edition, Potter
  Wiggert, Brooks Cole
• Applied Fluid Mechanics, 6th Edition, Mott,
  Prentice Hall
• Engineering Fluid Mechanics, 5th Edition Crowe,
  Roberson, Wiley
• Fluid Mechanics Cengel Cimbala McGraw Hill
• Which of the examples were helpful?