| Bernoulli’s
Equation (Continued) |
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| Flow Work (p/r) : |
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| It is
the work required to move fluid across the control volume boundaries. |
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| Dx |
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| Consider
a fluid element of cross-sectional area |
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| A
with pressure p acting on the control surface |
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| as shown. |
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| p |
| A |
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| Due
to the fluid pressure, the fluid element moves a distance Dx within |
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| time Dt. Hence, the work done per unit time DW/Dt (flow
power) is: |
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| Flow work or
Power |
| Flow
work per unit mass |
| 1/mass flow rate |
| Flow work
is often also referred to as flow energy |