Energy Conservation (cont.)

It is valid for incompressible fluids, steady flow along a streamline,

no energy loss due to friction, no heat transfer.

Examples:

Determine the velocity and mass flow rate of efflux

from the circular hole (0.1 m dia.) at the bottom of the

water tank (at this instant). The tank is open to the

atmosphere

and H=4 m

H

1

2

p1 = p2, V1=0

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