macromo_lect_2 - Macroscopic Momentum Balances Momentum...

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Macroscopic Momentum Balances
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Momentum Which terms can be eliminated? But why? Accumulation = In – Out + {Generation – Consumption} None: Momentum is not necessarily conserved It (momentum) can be generated by forces acting on system It is a vector quantity. Exerted momentum is based on flow direction
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Momentum So how is momentum transferred to a system? Bulk Flow Forces on System Shear Stress on Walls Fluid flows easier in center of pipe Friction Gravity
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Momentum Momentum is a vector quantity Must write balances in all three directions
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Momentum At Steady State Consumed Generated Output Input - + - = 0 cc c c c Flow Bulk o o o o o o o System on acting Forces
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Momentum Input Output Forces - =
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Bulk Flow Momentum Momentum Flow Rate Balance mu M = ( 29 S u u uS 2 ρ = = = u m M a a a b b b a b S u S u M M F 2 2 - = - =
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Why M? Newton’s Law ma F = dt du m = ( 29 dt mu d = dt dM = M F
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Forces Acting on Systems Surface Forces
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This note was uploaded on 04/17/2008 for the course CHE 353 taught by Professor Poehl during the Fall '07 term at University of Texas at Austin.

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macromo_lect_2 - Macroscopic Momentum Balances Momentum...

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