Lecture 15 HEF Su 2011 %281%29

Lecture 15 HEF Su 2011 %281%29 - ME 200 Thermodynamics I...

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Unformatted text preview: ME 200: Thermodynamics I Lecture 15: Control Volume Analysis - Mass Conservation H. Finney Summer 2011 2 In this Lecture … • We will study: – Control Volume Analysis – Mass Conservation 3 Examples of Open Systems 3 4 Conservation of Mass • Mass can neither be created nor destroyed (ignore nuclear reactions). – For a closed system (control mass), the system mass remains in one place during a process. • m system = constant – For an open system (control volume), there is mass flowing so it’s hard to keep track of individual packets. We therefore designate our system as a region in space, because that’s easy to keep track of. 4 5 Conservation of Mass e i cv m m dt dm Inlet, i Exit, e time rate of change of mass contained within the control volume at time t rate of mass flow across inlet i at time t rate of mass flow across exit e at time t e e i i cv m m dt dm mass rate balance 5 6 Mass Flow Rate • Amount of mass flowing through a cross...
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This note was uploaded on 09/26/2011 for the course ME 200 taught by Professor Gal during the Summer '08 term at Purdue.

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Lecture 15 HEF Su 2011 %281%29 - ME 200 Thermodynamics I...

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