Lecture 6.ppt - Lecture 6 d[m(u pe ke]system =(u pe ke)in...

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d[m(u+pe+ke)] system = [(u+pe+ke) in dm in + dQ in +dW in [(u+pe+ke) out dm out + dQ out + dW out ] d[m(u+pe+ke)] system = (u+pe+ke) in dm in (u+pe+ke) out dm out + dQ + dW d[m(u+gz+V 2 /2)] system = (u+gz+V 2 /2) in dm in (u+gz+V 2 /2) out dm out + dQ + dW Lecture 6

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INJECTION WORK dm dm d[m(u+gz+V 2 /2)] system = (u+gz+V 2 /2) in dm in v in dm in = volume associated with mass ‘dm’ dW= P. v in dm in d[m(u+gz+V 2 /2)] system = dW = (Pv) in dm in (Pv) dm = injection work dm
INJECTION WORK AND NON-FLOW WORK d[m(u+gz+V 2 /2)] system = (u+gz+V 2 /2) in dm in + (Pv) in dm i = (u+Pv+gz+V 2 /2) dm in dW = dW inj + dW n,f = (Pv) in dm in + dW n,f dm d[m(u+gz+V 2 /2)] system = (u+Pv+gz+V 2 /2) in dm in (u+Pv+gz+V 2 /2) out dm out + dQ + dW n,f

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ENTHALPY AND ENERGY BALANCE EQUATION IN TERMS OF ENTHALPY d[m(u+gz+V 2 /2)] system = ( u+Pv +gz+V 2 /2) in dm in ( u+Pv +gz+V 2 /2) out dm out + dQ + dW n,f u + Pv = h = enthalpy per unit mass d[m(u+gz+V 2 /2)] system = (h+gz+V 2 /2) in dm in (h+gz+V 2 /2) out dm out + dQ + dW n,f u + Pv = h = enthalpy per unit mass
STEADY STATE ENERGY BALANCE, INCOMPRESSIBLE FLOW d[m(u+gz+V 2 /2)]

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