Page 41 - ebook fluid mechanics_finalize

FLUID MECHANICS

3.2 CONCEPT OF PIEZOMETER, BAROMETER AND MANOMETER

3.2.1 Concept Of Piezometer

If liquid of density ρ, flow through the pipe, the fluid pressure can be measured by

installing a piezometer of a tube in the pipe. Fluid in the piezometer will rise to the height

h of the center line of the pipe like Figure 3.7. Pressure in the pipe center line at this point
2
is P = ρgh N/m

Figure 3.7 : Piezometer inside a pipe

Example 1

3
If the liquid in the pipe is water(ρ =1000kg/m ) and h =30cm, calculate pressure in the
pipe.

Solution :

Pressure( P ) = ρgh

= 1000 X 9.81 X 0.3

= 2.9 kN/m 2

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