Experiment number 06

Calibration of Orifice Plate

Objective: Calibration of the orifice plate.

Instruments: (same as experiment number 04)

Procedure: (same as experiment number 04)

Computations:

The orifice plate consists of a plate with a hole in its center. It is placed in a conduit so that the flow passes only through the hole at its center. Measurement of the pressure drop across the conduit provides a means of determining the flow rate in the conduit. If A₁ is the conduit area and A₂ be the orifice hole area then

Q_theory= A₂/{1-(A₂/A₁)}² { 2g(h)(g_m/g-1)}^1/2

Where

g= acceleration due to gravity

h= pressure difference between the inlet and the outlet of the orifice

g_m= specific weight of the manometric liquid

g= rg

r= Density of the manometric liquid.