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What's the pressure acting on this fluid?

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Marmoteer
#1
Nov2-13, 10:32 PM
P: 8
I understand that as an incompressible fluid flows through a pipe with decreasing cross sectional area the velocity increases. This must happen for the mass/volume continuity equations to be true. Since the velocity is increasing though there has to be a net pressure on the fluid right? My question is - what's the best way to think about this pressure? Is it like pressure "buildup" because the flow is restricted? Or is there a better way to interpret it?
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boneh3ad
#2
Nov3-13, 01:29 AM
PF Gold
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P: 1,486
Think of it more like potential energy, and as the velocity increases, more is converted to kinetic energy (dynamic pressure) so the static pressure falls. Indeed, the units of pressure can be rewritten as energy per volume.


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