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Lecture 5
 

Lecture 5

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    Lecture 5 Lecture 5 Presentation Transcript

    • Lecture 5 Fluid Mechanics II Muhammad Usman
    • Reciprocating Pumps
      • Suitable for less discharge and higher heads.
      • A positive displacement pump is one in which a definite volume of liquid is delivered for each cycle of pump operation.
    • Air Vessels
      • An air vessel is a cast iron closed chamber having an opening at its base through which the water flows into the vessel or from the vessel.
      • The purpose of using the air vessel to obtain unifrom discharge from the reciprocating pump.
    • Rotary Pumps
      • Self primed due to their capacity to remove air from the suciton line.
      • These pumps are used for systems require high suction lift.
      • These are positive displacement and have constant discharge.
    • Gear Pump
    • Lobe Pump
    • Screw Pump
    • Vane Type Pump
    • Diaphragm Pump
    • Example 1
      • A centrifugal pump has external and internal impeller diameters as 600 mm and 300 mm respectively. The vane angle at inlet and outlet are 30° and 45°respectively. The water enters the impeller at 2.5 m/s, the velocity of flow is constant through the impeller is constant. Find
      • Speed of impeller in r.p.m.
      • Work done per KN of water
    • Example 2
      • Calculate vane angle at the inlet of a centrifugal pump impeller having 200 mm diameteer at inlet and 400 mm diameter at outlet. The impeller vanes are set back at angle of 45° to the outer rim, and the entry of the pump is radial. The pump runs at 1000 r.p.m and velocity of flow through the impeller is constant at 3 m/s. Also calculate the work done per kN of water and the velocity as well as direction of the water at outlet.