what is the principale of vortex flow meter.
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Answer Posted / goldengineer14
The principle of a vortex flowmeter’s operation is based on a phenomenon of vortex shedding
known as the Von Karman effect of flow across a bluff body. A bridge pier in a river generates
Von Karman vortices. The principle states that flow alternately sheds vortices from one side to
the other side of a bluff body. The frequency of the shedding is directly proportional to fluid
velocity across the body. As a fluid passes the bluff body it separates and generates small eddies
or vortices that are shed alternately along and behind each side of the bluff body.
The output of the vortex flowmeters depends on the K-factor. The K-factor relates the frequency
of generated vortices to the fluid velocity. The K-factor varies with the Reynolds number, but is
virtually constant over a broad flow range. Figure 71 shows the relationship between two
numbers. The formula for fluid velocity is
Fluid velocity =Vortex frequency/K - factor
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