Thermo Exam 3 Cheat Sheet

# Thermo Exam 3 Cheat Sheet - • when = k cp T cv T …...

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- Specific Volume of a Two Phase Liquid-Vapor Mixture: = + ( - ) v vf x vg vf Internal Energy of a Two Phase Liquid-Vapor Mixture: = + ( - ) u uf x ug uf Enthalpy of a Two Phase Liquid-Vapor Mixture: = + ( - ) h hf x hg hf Entropy of a Two Phase Liquid-Vapor Mixture: = + ( - ) s sf x sg sf For Ideal Gases: = cp∙cv R where R=gas constant = k cpcv Approximating values for , , v u and h at liquid states at the temperature: , = vT p vfT , = uT p ufT , = ( ) hT p hf T Universal Gas Constant: = . R 8 314 kJkmole∙K and = R RM Ideal Gas Model: = pv RT = pV mRT with = v Vm = pv RT using = v vM and = R RM and = M molecular weight = pV nRT using = v Vn Change in Specific Internal Energy: - = uT2 uT1 T1T2cvTdT Change in Specific Enthalpy: - = hT2 hT1 T1T2cpTdT = + cpT cvT R = + cpT cvT R
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Unformatted text preview: • when = ( ) ( ) k cp T cv T … =-cpT kRk 1 and =-cvT Rk 1 •- ( )= (-) uT2 u T1 cv T2 T1 •- ( )= (-) hT2 h T1 cp T2 T1 • Mass Flow Rate for One-dimension: = m ρAV or = m AVv • Nozzle/Diffuser: W=0, PE=0, m=same • Turbine: KE=0 & PE=0 • Compressor(gas)/Pump(liquid): Q=0 • Heat Exchanger: example of a heat exchanger is a mixing chamber; W=0, KE=0, PE=0, Q=0 • Rigid Tank: no work done • Adiabatic: no heat • W>0 when word is done by the system; W<0 when work is done on the system • Throttling: = h1 h2 • Transient: -= -+ *-* U2 U1 Q W mi hi me he =--(-) Q m2u2 m1u1 he m2 m1 • • = m Vv • = AV mv =volume flow rate •...
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## This note was uploaded on 05/18/2011 for the course MECHANICAL 290 taught by Professor Khan during the Spring '11 term at Columbia SC.

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