IncompSubtance

# IncompSubtance - (T T h h = c(T T v(P P s s = c ln T T 2 1...

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ME 201 Thermodynamics 1 ME 201 Thermodynamics Incompressible Substance Property Evaluation Guide (For ME 201 see summary at end) Most normal liquids and solids at normal pressures and temperature can be treated as incompressible substances provided that there are not phase changes occurring. The equation of state for an incompressible substance assumes that the specific volume is only a function of temperature and it or the density are given in tabular form. Recall that density. the is where , 1 = v ρ ρ For an incompressible substance we also a unique relationship among the two specific heats, as shown below c = c v P To evaluate changes in internal energy, enthalpy, and entropy for an incompressible substance we assume a constant specific heat and write u - u = c

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Unformatted text preview: (T T ) h- h = c (T T ) + v (P P ) s- s = c ln T T 2 1 P,avg 2 1 2 1 P,avg 2 1 avg 2 1 2 1 P,avg 2 1---⋅ where c = c @ T + T 2 and v = v @ T + T 2 P,avg P 1 2 avg 1 2 ME 201 Thermodynamics 2 Summary for ME 201 Students Relationships for an Incompressible Substance v = fn(T) only c = c v P Assuming Constant Specific Heat u- u = c (T T ) h- h = c (T T ) + v (P P ) s- s = c ln T T 2 1 P,avg 2 1 2 1 P,avg 2 1 avg 2 1 2 1 P,avg 2 1---⋅ where c = c @ T + T 2 and v = v @ T + T 2 P,avg P 1 2 avg 1 2 Always Work in Absolute Temperature for an Incompressible Substances...
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IncompSubtance - (T T h h = c(T T v(P P s s = c ln T T 2 1...

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