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Flow Measurement

Flow Measurement. Pitot tube * V = [ 2g ( P 1 -P 2 )/ ] 1/2 Orifice meter V = [ 2g ( h 1 -h 2 )/(1 – C o )] ½ h = ( P/ ) + Z. Homework . Water flows through a 2-inch diameter pipe at 200 lbm/min. Its temperature is 60 o F. Find the velocity of water flow. Homework .

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Flow Measurement

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  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?

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