The venturi meter
results in a flow restriction  and significant pressure drop in the dilution air pipe.
Defining the section of the Venturi meter
as in Figure 8, it is possible to define  a diffuser pressure recovery coefficient (Cp) as
Differential Pressure (DP) flow meters have been widely used since Herschel first developed the Venturi meter
in the 1880s.
x 36-in.), venturi meter
with a throat diameter of approximately 20 in., line gate valves 30 in.
Figure 3 shows a 2010 wet gas test at CEESI of a 4-inch Venturi meter
. The CEESI view port is seen upstream of the meter under test.
There are various designs of multiphase flow meters, but virtually all tend to use some sort of differential pressure measurement, usually a Venturi meter
, to measure total mass flow rate, combined with other technologies, such as gamma radiation or electromagnetic methods, to determine the relative amounts of oil, water and gas.
DIFFERENTIAL FLOW RATE METERS Differential flow meters, including Venturi meters
and wedge-type meters, unlike many metering technologies, have no moving parts, which means significant operational expenditure and lifecycle savings for operators.
Their investigations prompted many potential solutions involving scientific principles and equipment such as pitot tubes, venturi meters
, turbines and ultrasound.
The Todd researchers measured both the airflow through each burner and the air distributed around each burner using miniature pitot tubes and venturi meters
made by Todd.