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MECH 213 - 9.12.07 (edit)

# MECH 213 - 9.12.07 (edit) - n = c o Per unit mass where p =...

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MECH 213 – September 12, 2007 Incompressible Substances - u = u(T) o Liquid u = u [email protected] v = v [email protected] s = s [email protected] h = h [email protected] + v [email protected] (p – p Phase change o Wet Mixture Superheated u = f(T,x) = g(p,x) u = u(p,t) h = h(T,x) = h(p,x) h = h(p,T) v = v(T,x) v = v(p,T) Ideal Gas o pv = RT o v = RT/p Real gas correction pv = zRT o u = u(T) o h = h(T) o s = s(p,T) Processes on PV-Diagram o Constant Volume – vertical line o Constant Pressure – horizontal line o Polytropic – pv
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Unformatted text preview: n = c o Per unit mass where p = cv-n o Boundary work o W b = int(pdv, v, v1, v2) o W b = int(cv-n dv,v,v1,v2) o w b = c(lnv2 – lnv1) o w b = c*ln(v2/v1) o Constant Temp (n = 1) o c = p1v1 = p2v2 = RT o n does not equal 1 o w b = c/(1-n)(v2 1-n – v1 1-n ) o w b = (p2v2 – p1v1)/(1-n) = [R(T2 – T1)]/(1-n) n = inf (Constant v) n = 0 (constant p) n = 1 (constant T) n = k...
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