Lec 12 (Dr. Yasser).pdf - Pumps Fluid Mechanics and...

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PumpsFluid Mechanics and Hydraulic Machines (MR232)Fluid Mechanics IIByAssoc. Prof. Dr. Yasser M. AhmedDept. of Naval Architecture and Marine Engineering,Faculty of Engineering, Alexandria University,Alexandria, Egypt
Cavitation in Pumps
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As atmospheric pressure steadily becomes lowerat increasing heights above sea level, less heat isneeded to boil water
Venturi Tube
VAPOR PRESSUREPRESSURE100 bar10 bar1 bar0.1 bar0.01 bar300oC200oC100oC40oC10oCWorking temperatureVapor pressureVAPOR LOCKCAVITATION
MECHANISM OF CAVITATIONPressure increasesLow pressure regionsPittingCavityVapor bubbles
EFFECT OF CAVITATIONQHDrop in headand flow rateVibrationand noisePremature failure
Cavitation in Turbomachines (pumps)Cavitation refers to conditions at certain locations withinthe turbomachine (pump) where the local pressure dropsto the vaporpressure of the liquid, and as a result, vaporfilled cavities (bubbles) are formed. As the cavities are
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