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Unformatted text preview: ME 200: Thermodynamics I Lecture 5: Expansion/Compression Work, other Examples of Work Prof. Sojka Summer 2011 2 In this Lecture Expansion/compression (boundary work) Other examples of work 3 Types of Mechanical Work Moving a system boundary Rotating shaft Stretched spring Stretching an elastic solid bar Stretching a liquid film Accelerating a body Raising a body 4 Moving Boundary Work Fdx W = 2 1 s s sdF W = 2 1 s s sdF W pA F dV Adx pdV W = 2 1 V V pdV W 5 Moving Boundary Work W = pdV means W cannot be computed until we know how p depends on V (i.e., we know the path or process ). MOVING BOUNDARY WORK IS NOT A PROPERTY. 6 Moving Boundary Work PolytropicProcess For an ideal gas C pV n = n and C are constants n T T mR W = 1 1 2 = 1 2 ln V V pV W n 1 n = 1 n CV p = n Vp Vp Vpd W = = 1 11 22 2 1 7 Shaft Work Fds W = 2 1 s s sdF W d Fds d W t W = W & torque angularvelocity (rad/s) 8...
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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 UniversityWest Lafayette.
 Summer '08
 GAL

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