Wk_5_Recitation_Wk_5 - Thermodynamics, Week 5 Important...

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Thermodynamics, Week 5 Important Ideas Unsteady Flow: Transient flow processes involving changes within the control volume Mass and Energy contents within the control volume change with time: Change within a system = What comes in – What goes out - = exit e inlet i cv m m m ) 2 ( ) 2 ( 2 2 1 e e e exit e inlet i i i cv cv cv gz V h m gz V h m W Q U + + - + + + - = Typical Idealization : flows at inlets and outlets are steady and uniform; flow properties don’t change with respect to time. The energy equation above is GOOD ONLY FOR steady inlet and exit flows. The shape and size of a control volume may change during an unsteady-flow process. Heat Reservoir/Sink: A body with an infinite amount of energy such that when in thermal contact with a system can maintain that system at a constant temperature, e.g., a sea or the sun. Kelvin-Planck Statement of the 2 nd Law of Thermodynamics: A device cannot produce a net amount of work by operating in a cycle with only one heat reservoir.
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This note was uploaded on 03/15/2010 for the course ENGRD 221 taught by Professor Staff during the Fall '08 term at Cornell University (Engineering School).

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Wk_5_Recitation_Wk_5 - Thermodynamics, Week 5 Important...

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