Lecture 5

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Lecture 5

  1. 1. Lecture 5 Fluid Mechanics II Muhammad Usman
  2. 2. Reciprocating Pumps <ul><li>Suitable for less discharge and higher heads. </li></ul><ul><li>A positive displacement pump is one in which a definite volume of liquid is delivered for each cycle of pump operation. </li></ul>
  3. 3. Air Vessels <ul><li>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. </li></ul><ul><li>The purpose of using the air vessel to obtain unifrom discharge from the reciprocating pump. </li></ul>
  4. 4. Rotary Pumps <ul><li>Self primed due to their capacity to remove air from the suciton line. </li></ul><ul><li>These pumps are used for systems require high suction lift. </li></ul><ul><li>These are positive displacement and have constant discharge. </li></ul>
  5. 5. Gear Pump
  6. 6. Lobe Pump
  7. 7. Screw Pump
  8. 8. Vane Type Pump
  9. 9. Diaphragm Pump
  10. 10. Example 1 <ul><li>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 </li></ul><ul><li>Speed of impeller in r.p.m. </li></ul><ul><li>Work done per KN of water </li></ul>
  11. 11. Example 2 <ul><li>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. </li></ul>

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