Rubber_Engine

Rubber_Engine - stretches (4 1) The Carnot Cycle for the...

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The Carnot Cycle for an Elastomer Kristina Hirsch Matt Lamm April 26, 2001
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Elastomers ] Amorphous Materials (Often) ] Cross-linked Chains ] Tg is Below Room Temperature ] Common Rubber Band ] Stretching an elastomer => it warms up ] Heating an elastomer => it shrinks
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Heat and Work Equations GAS U 12 = - ³ PdV U 23 = 0 = T 2 S 2 - ³ PdV U 34 = - ³ PdV U 41 = T 1 S 1 - ³ PdV S = q/T ELASTOMER U 12 = ³ f dL U 23 = 0 = T 2 S 2 + ³ fdL U 34 = ³ fdL U 41 = T 1 S 1 + ³ fdL S = nR [(L/L o )–(L o /L) 2 ]
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The Carnot Cycle – Gases A. Reversible adiabatic compression (1 2) B. Reversible isothermal expansion (2 3) C. Reversible adiabatic expansion (3 4) D. Reversible isothermal compression (4 1)
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The Carnot Cycle – Elastomers A. Elastomer adiabatically stretches (1 2) B. Elastomer isothermally contracts (2 3) C. Elastomer adiabatically contracts (3 4) D. Elastomer isothermally
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Unformatted text preview: stretches (4 1) The Carnot Cycle for the Elastomer Wheel *Yellow Region near adiabatic length increase due to gravity. *Red Region heat source, heat is absorbed nearly isothermally, length increases. *Green Region near adiabatic length decrease due to gravity. *Blue Region heat given off nearly isothermally, length increase. Will this wheel work with Metal Spring? ] In elastomers, chains disentangle when stretched. ] Constant volume when stretched. ] Heating causes contraction and cooling causes stretching. ] In metals, elasticity arises from an increase in the distance between atoms ] Volume increases when stretched ] Heating causes expansion and cooling contraction Rubber Metal...
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This note was uploaded on 12/24/2011 for the course MSE 4554 taught by Professor Staff during the Fall '08 term at Virginia Tech.

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Rubber_Engine - stretches (4 1) The Carnot Cycle for the...

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