eml 3100 lec 9 engineering devices

eml 3100 lec 9 engineering devices - Thermodynamics Steady...

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1 Thermodynamics Steady Flow Engineering Devices Nozzles/Diffusers Turbines/Compressors Throttling Devices Mixing Boxes Heat Exchangers
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2 Thermodynamics The Steady Flow Energy Equation )) ( ) 2 / ) (( ) (( 1 2 1 2 1 2 2 2 z z g V V h h m W Q other - + - + - = - On a unit mass basis: q – w other = h 2 -h 1 + (V 2 2 -V 1 2 )/2 + g(z 2 – z 1 ) Note: V in these eqns is velocity, not volume
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3 Thermodynamics ) 2 / ) (( 0 2 2 1 2 1 2 V V h h - + - = Generally: Well insulated, no heat transfer No other work, no W other Minimal elevation change, no change in pe Therefore Note: 1 2 2 1 2 2 2 1 1 1 2 2 2 1 1 1 . / / v A V v A V or A V A V m = = = σ )) ( ) 2 / ) (( ) (( 1 2 1 2 1 2 2 2 z z g V V h h m W Q other - + - + - = -
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4 Thermodynamics )) ( ) 2 / ) (( ) (( 1 2 1 2 1 2 2 2 z z g V V h h m W Q other - + - + - = - ) ( 1 2 h h m W other - = - Compressors and Turbines Generally: Well insulated, no heat transfer Minimal velocity change, ke change ~0 Minimal elevation change, pe change~0 Therefore Work In Work Out 1 2 2 1
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This note was uploaded on 09/05/2011 for the course EML 3100 taught by Professor Sherif during the Summer '08 term at University of Florida.

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eml 3100 lec 9 engineering devices - Thermodynamics Steady...

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