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Unsteady Flow in Pipes

Unsteady Flow in Pipes. Prof Tiit Koppel Department of Mechanics Tallinn University of Technology University of Brighton October 14, 2008. Unsteady Flow. Unsteady Flow Waterhammer Steady Oscillatory Flow Periodic Flow (Pulsatile) Resonance. Hydraulic System. Shear Stress Probe.

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Unsteady Flow in Pipes

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  1. Unsteady Flow in Pipes Prof Tiit Koppel Department of Mechanics Tallinn University of Technology University of Brighton October 14, 2008

  2. Unsteady Flow Unsteady Flow Waterhammer Steady Oscillatory Flow Periodic Flow (Pulsatile) Resonance

  3. Hydraulic System

  4. Shear Stress Probe

  5. LDV

  6. Pipe Section

  7. Pipe Section

  8. Start-up Flow

  9. Turbulence Generation

  10. Constant Pressure Gradient

  11. Development of the Thickness of the Boundary Layer

  12. Regions of Laminar and Turbulent Flows

  13. Spectral Distribution

  14. Turbulence Generation

  15. Velocity Distribution

  16. Acceleration from One Steady to Another

  17. PIV Measurements

  18. Calculated and Measured Pressure

  19. Calculated Pressure

  20. Set-up for Pulsating Flow with Heat Load

  21. Temperature

  22. Mean Temperature

  23. Wall Temperature

  24. Transient vaporous and gaseous cavitation in pipelines (EU HYDRALAB III PROJECT: Deltares dynamic multi-phase flow rig) TUT team: Janek Laanearu, Tiit Koppel and Ivar Annus PROJECT FOCUSon cavitation processes in the fully- and partly-filled pipelines. Two-phase flow experiments are proposed in the DELTARES large-scale test facility made of PVC (D250) pipelines.

  25. Expected benefits from the use of the large installation • Better understanding of physics of large-scale flow in two-phase system • Validation of existing numerical codes and improvement of models • Economic design of new piping systems (water supply, hydropower, fluid transport) • Fast filling and emptying procedures for (fuel) transport and fire fighting systems • Safer operation of aging pipelines

  26. Cavitation is a complex phenomenon that may appear in hydraulic machinery and pipe systems in several forms, affecting their operation in many different ways. Cavitation in hydraulic machinery may lead to reduction of the performance of pumps (head), turbines (efficiency) and valves (flow capacity), and produce erosion, vibrations and noise emission.

  27. Water Hammer Continuity Momentum

  28. Two-phase Flow

  29. Discrete Cavitation

  30. Animation of the Water Hammer Oil pipeline L = 10 km D = 900 mm C = 1100 m/s

  31. Thank You for Your Attention!

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