KALI CHARAN NIGAM INSTITUTE OF
TECHNOLOGY, BANDA
LECTURE
ON
ORIFICE-METER
FUNDAMENTAL OF MECHANICAL ENGINEERING (BME101)
( I SEMESTER )
BY : DEEPAK KUMAR YADAV
ME DEPARTMENT

ORIFICE-METER
It is device used for measuring the rate of flow of
a fluid through a pipe.
It is a cheaper device as compared to
venturimeter.
It consists of a flat circular plate which has a
circular sharp edged hole called orifice.

RATE OF FLOW OR DISCHARGE
THROUGH ORIFICE-METER
• Let p1, p2 = pressure at
section 1 &2
• v1, v2 = velocity at section 1
&2
• a1, a2 = area at section 1 &2
• Applying Bernoulli’s at
section 1 and 2

RATE OF FLOW OR DISCHARGE
THROUGH ORIFICE-METER
Or

RATE OF FLOW OR DISCHARGE
THROUGH ORIFICE-METER
• Now section (2) is at the vena-contracta and a2
represents the area at the vena-contracta. If ao
is the area of orifice then , we have

RATE OF FLOW OR DISCHARGE
THROUGH ORIFICE-METER
Now
Substituting this value of C c on Q , we get

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