Pumps_lecture - Pumps(Most material from Fluid Mechanics...

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Pumps (Most material from Fluid Mechanics , Ç engel and Cimbala, Chapter 14) Introduction and Terminology : Pump ” is a general term for any device that adds mechanical energy to a fluid. For liquids, we usually call them “ pumps ”. For gases, we usually call them “ fans ”, “ blowers ”, or “ compressors ”, depending on the relative pressure rise and volume flow rate. There are two basic types of pump: Positive displacement pumps (PDPs) – fluid is sucked into a closed volume, and then the fluid is pushed out. Dynamic pumps – no closed volume is involved; instead, rotating blades called impeller blades supply energy to the fluid. Positive Displacement Pumps : Your heart is a great example of a positive displacement pump (PDP). Blood is pushed out when the right and left ventricles contract. Again, the appropriate valves open and close to enable this. Blood is sucked into the right and left ventricles as they expand. The appropriate valves open and close as necessary.
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