Basic Working Principle of Vortex Flowmeter

A vortex flow meter works based on the principle of ‘Karman vortex street’ demonstrated in the below figure.

This principle essentially means that when an obstruction is placed in the path of a flow, it can produce a series of vortices alternating from each side of the obstruction.

The frequency of alternating of these vortices is proportional to the flow rate being obstructed.

Vortex Flowmeter

Basic Working Principle of Vortex Flowmeter

The vortex-type flow meter uses a small rod called a ‘shredder bar’ or ‘bluff bar’ to shred vortices and these vortices produced are directly proportional to the flow rate. These vortices can be measured using a pressure sensor and it calculates a proportional flow rate.

In some applications, different types of sensors may be used in place of pressure sensors.

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