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Chapter 8 – Pipe Flow

Chapter 8 – Pipe Flow. CE30460 - Fluid Mechanics Diogo Bolster. Laminar or Turbulent Flow. Re >4000. Re <1000. Re= UD r/m. Laminar Flow http:// www.youtube.com/watch?v =KqqtOb30jWs&NR=1. Turbulent Flow http:// www.youtube.com/watch?v =NplrDarMDF8. Fully Developed Flow.

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Chapter 8 – Pipe Flow

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  1. Chapter 8 – Pipe Flow CE30460 - Fluid Mechanics Diogo Bolster

  2. Laminar or Turbulent Flow Re>4000 Re<1000 Re=UDr/m Laminar Flow http://www.youtube.com/watch?v=KqqtOb30jWs&NR=1 Turbulent Flow http://www.youtube.com/watch?v=NplrDarMDF8

  3. Fully Developed Flow Entrance length:

  4. Fully Developed Laminar Flow • We’ve done this one already in chapter 6

  5. What about Turbulent Flow Typically: n is between 6 and 10

  6. Dimensional Analysis • Pressure Drop depends on • Mean velocity V • Diameter D • Pipe length l • Wall Roughness e • Viscositym • Densityr • By dimensional Analysis

  7. Pressure drop must increase linearly with length of tube • Recall from chapter 5 • Therefore we can say that (part of) the loss in a pipe is Friction factor – look up in table

  8. Moody Diagram (Friction Factor) For laminar For non-laminar flow approximately true that

  9. Roughness (Typical)

  10. Minor Losses KL depends on the flow (expansion, contraction, bend, etc)

  11. Minor Losses

  12. Minor Losses

  13. Sample Problem

  14. Sample Problem

  15. Sample Problem

  16. Pipe Flow Measurement C is a constant that depends on geometry

  17. Sample Problem

  18. More Problems

  19. Single Pipe – Determine Pressure Drop

  20. Single Pipe – Determine Flowrate

  21. Single Pipe – Determine Diameter

  22. Multiple Pipe Systems

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