CONVECTION AND MATTER TRANSPORT PROCESSES REVIEW: CLOSED SYSTEM
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1 CONVECTION AND MATTER TRANSPORT PROCESSES REVIEW: CLOSED SYSTEM Simple substance i.e., no reacting components internal energy U = U(S,V,m) constant mass makes this a two-port capacitor one port for each variable argument of the energy function displacements: S, -V flows: ds/dt, dv/dt efforts: total differential of internal energy: du = ( U/ S)dS + ( U/ V)dV = TdS PdV. from this we identify efforts on the two ports as T, P Mod. Sim. Dyn. Sys. Convection and matter transport page 1
2 OPEN SYSTEM: Mass may vary. Simple substance internal energy U = U(S,V,m) For convenience, work with molar units for mass. Rewrite in terms of moles using m = M N where N is number of moles (units of N: e.g. Kg-moles, pound-moles) M is molecular weight (for a non-reacting mixture like air, M is an equivalent molecular weight) Internal energy now has three variable arguments. U = U(S,V,N) Variable mass makes this a three-port capacitor. Mod. Sim. Dyn. Sys. Convection and matter transport page 2
3 Generalized displacement associated with mass port : number of moles, N corresponding flow variable: mass flow rate dn/dt = N Corresponding effort variable: evaluate total differential of internal energy: du = ( U/ S)dS + ( U/ V)dV + ( U/ N)dN du = TdS PdV + µdn effort on the mass flow port (a definition): µ U N S,V T Ṡ C µ N P V Mod. Sim. Dyn. Sys. Convection and matter transport page 3
4 WHAT IS THIS EFFORT µ? Form the Gibbs free energy function. A Legendre transform of internal energy with respect to both the temperature-entropy and pressure-volume ports. G = U TS + PV = G(P,T,N) dg = du TdS SdT + PdV + VdP substitute: dg = TdS PdV + µdn TdS SdT + PdV + VdP dg = µdn SdT + VdP µ G N P,T Thus µ has the same units as chemical potential. Gibbs free energy per mole at constant temperature and pressure. Because we dealing here with a single species and no reactions, µ has been termed a matter potential. Aside: G Note that = N P,T U N S,V Mod. Sim. Dyn. Sys. Convection and matter transport page 4
5 TRANSPORT PROCESSES: That s a strange-looking effort -- can we make sense of it? How do we account for the power flow associated with mass transport? Consider power flow past a given cross section. There are two components: "flow work rate" "energy convection (transport) rate" Neglecting kinetic energy: convected energy rate: u N (rate of energy carried with the flow) P flow work rate = PQ = ρq = Pv N ρ (rate of work done in moving the fluid) Mod. Sim. Dyn. Sys. Convection and matter transport page 5
6 Net power flow P net = (Pv + u) N = h N h: molar specific enthalpy. From this it appears that the appropriate effort is (molar) specific enthalpy. Aside: The above considered only convected internal energy. A similar argument may be applied to include other convected quantities. Mod. Sim. Dyn. Sys. Convection and matter transport page 6
7 µ or h? How can we reconcile this apparent contradiction? Consider the Legendre transforms which define the Gibbs function and the enthalpy: G = U + PV TS H = U + PV H TS = G That is, Gibbs free energy is a Legendre transform of enthalpy with respect to the temperature-entropy port. or G + TS = H per unit mass (in moles): µ + Ts = h Mod. Sim. Dyn. Sys. Convection and matter transport page 7
8 KEY POINT: MASS FLOW AND ENTROPY FLOW ARE FUNDAMENTALLY COUPLED The effort, µ, associated with accumulation of mass in the three-port capacitor does not fully account for the total energy added. Energy convection fundamentally requires entropy convection. Physically, there is a single "port" for mass flow. Conceptually, the mass flow (µn ) port is fundamentally coupled to the thermal (TS ) port. Mod. Sim. Dyn. Sys. Convection and matter transport page 8
9 HOW MAY WE DEPICT THIS COUPLING? One way: using a modulated transformer as follows: entropy flow heat T port P pressure transfer 0 C work port Ṡ V port µ s MTF 1 : N molar specific h entropy mass flow port Note that the heat transfer port is NOT identical to the entropy flow port. Adiabatic conditions are equivalent to closing the heat transfer port. That does NOT prevent entropy flow. adiabatic isentropic Entropy flow (and entropy production) does NOT require heat transfer. Mod. Sim. Dyn. Sys. Convection and matter transport page 9
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