Lect5Div2&amp;5ExpCompWorkSP2012

# Lect5Div2&amp;5ExpCompWorkSP2012 - ME 200:...

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ME 200: Thermodynamics I Lecture 5: Expansion/Compression Work

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Last Lecture System Energy Interactions » Heat Transfer: temperature difference driving force » Work: all energy interactions other than heat transfer » Heat and work are not properties of system » Difference between Point and Path functions
This Lecture System Energy Interactions » Mechanical Work – Moving Boundary Work

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Mechanical Work A force acting through a given distance results in work If F is constant, then W = Fs If F is not constant, then we consider small amounts of work and add them up  22 11 () WF s d s W W F s d s    s F Position 1 Position 2
Mechanical Work (contd.) In thermodynamics, we must have two important conditions for mechanical work interaction between a system and its surroundings » movement of the boundary of the given system » either a resisting force or a driving force for such motion of the boundary » if any one of the above is absent, there is no boundary work

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Expansion or compression of a given pure substance inside a piston-cylinder device Actual processes inside an engine or a compressor
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## This note was uploaded on 01/26/2012 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue University-West Lafayette.

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Lect5Div2&amp;5ExpCompWorkSP2012 - ME 200:...

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