Div2Lec02

Div2Lec02 - Lecture 2 Review 1st Law Open System CV A mout...

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Lecture 2: Review - 1 st Law Open System: CV . . m out A . . m in B Q W A: a small slug of fluid at the inlet enters the CV and brings its energy with it. B: a small slug of fluid leaves the CV 2.1 g
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Control Volume Analysis CV A onservation of mass: B Conservation of mass: » At time t = 0, » At time t = dt, 2.2
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Continue Conservation of Mass Taking the difference: Dividing by dt and letting dt 0: Generalizing to multiple inlets and outlets: 2.3
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Continue Conservation of Mass For steady-state operation: 2.4
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Continue 1 st Law for Open Systems CV A Conservation of Energy B » At t = 0 » At t = dt »T a k i n g the difference: 2.5
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Continue 1 st Law for Open Systems We know: Solving for: Consider dE A /dt and dE B /dt If the regions A and B are infinitesimally small, then constant 2.6 e i is constant
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Continue 1 st Law for Open Systems Generalizing for multiple inlets and outlets, we obtain: 2.7
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Continue 1 st Law for Open Systems Going back to the first law equation: 2.8
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Continue 1
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This document was uploaded on 04/23/2011.

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Div2Lec02 - Lecture 2 Review 1st Law Open System CV A mout...

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