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Practice Problems

Practice Problems. Handout Gravity feed Pump. Homework. See handout Show all calculations. Pipes Fittings Valves Vessels. Nozzles Meters Process equipment. Pumping system. Pump characteristics. Capacity – discharge rate Discharge head Power Efficiency

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Practice Problems

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  1. Practice Problems • Handout • Gravity feed • Pump

  2. Homework • See handout • Show all calculations

  3. Pipes Fittings Valves Vessels Nozzles Meters Process equipment Pumping system

  4. Pump characteristics • Capacity – discharge rate • Discharge head • Power • Efficiency • Operational factors: impeller diameter & speed (D & N) • BEP

  5. Pumping system • Steady state • Elevation may change • Fluid pressures may change • Pressure & elevation – fixed head • Velocity head may change • Head loss = f(V2) • Variable head • System head = fixed + variable heads

  6. Example • What is the discharge rate of this pump in this system? Let f = 0.015.

  7. Elevation 230m Elevation 200m 1000 m pipe 40cm diameter

  8. Chapter 1 Chapter 2 Chapter 3: omit section 3.10 Chapter 4 Chapter 5: omit sections 6 & 7 Chapter 6: Chapter 7 Chapter 8: omit sections 10 & 11 Chapter 9: omit section 7 Chapter 10: omit sections 13 through 15 Mott Reading

  9. References • Images & examples • Fluid Mechanics Fundamentals & Applications, 6th Edition, Cengel & Cimbala, McGraw Hill • Applied Fluid Mechanics, 6th Edition, Mott, Prentice Hall • Engineering Fluid Mechanics, 5th Edition Crowe, & Roberson, Wiley • Which of the examples were helpful? • Why?

  10. Turbomachinery • Rotating element connected to a shaft • Turbine: device to extract energy from fluid stream. Pressure decrease. • Pump, fan, compressor: devices to add energy to fluid stream. Pressure increase. • Steady state: rotational speed of rotor does not vary.

  11. Moving gases • Fans • Blowers • Compressors

  12. Moving liquids • Pump • Positive displacement • Kinetic/dynamic – centrifugal pump

  13. PD pump • High discharge pressure : PRV needed • High viscosity • Shear sensitive • Relatively low volume • Self- priming

  14. Positive Displacement Pumps

  15. PD pumps • Pulsations

  16. Dynamic pumps • Axial • Radial • Mixed flow

  17. Centrifugal pump • Many applications • Chemicals • Petroleum • Pulp & Paper • Cooling towers • Auto engine cooling • Ventilation

  18. Centrifugal • High volume • Low to moderate discharge pressures • Low viscosities

  19. Centrifugal Pump • Velocity head → pressure head • Impeller design • Net head • Power added to liquid • Efficiency • BEP

  20. Centrifugal Pump • Pump curves • RPM • Head • Capacity • Impeller size • BHP • Efficiency • NPSH

  21. Centrifugal Pump • NPSH: available & required • Cavitation • Practice problems handout

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