class11_Bernoulli

class11_Bernoulli - – Key words: • inviscid (no...

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10/5/2007 1 ES330, Section 2 Dr. Douglas Bohl 239 Camp x6683, [email protected] www.clarkson.edu/~dbohl/es330 Harrier “Jump-Jet”

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2 Outline • Review Efficiency • Derive the Bernoulli Equation – Cautions and Assumptions –E x am p l e s
3 Efficiency • There are 2 types of inefficiencies in a pump/turbine system – Pump inefficiency: Not all of the power you put into a pump goes to pump work • Heat generated • Pump work – Key word/phrase: “pump is ?? efficient.” η =W pump /W input

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4 Efficiency • There are 2 types of inefficiencies in a pump/turbine system – Fluid efficiency: Not all of the work the pump does goes into moving the fluid. • Frictional heating •F

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Unformatted text preview: – Key words: • inviscid (no friction, no frictional losses) • Maximum flow rate (no frictional losses), ideal case that represents the limit • Head loss (amount of work lost to frictional effects) – η =(W pump-loss)/W pump 5 Pumps • The pump will respond to the system and give you the flow rate accordingly 6 Flow along and normal to a streamline • Change our frame to look at flow along a stream line. • What is the definition of a streamline? 7 8 9 10 Example A smooth plastic 10m long hose with an inside diameter of 20mm is used to empty a pool as shown. If viscous effects are neglected what is the volume flow rate from the pool? 11 Note! • When V=0 in a fluid the streamlines are undefined so all points are essentially on the streamline • When a fluid exits into the atmosphere the pressure at the exit is equal to the atmospheric pressure 12 13 14...
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This note was uploaded on 04/07/2008 for the course ES 330 taught by Professor Bohl during the Spring '08 term at Clarkson University .

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class11_Bernoulli - – Key words: • inviscid (no...

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