Papua New Guinea SH-LUG Series Vortex Flowmeter

The vortex flowmeter operates on the basis of Karman vortex street principle.

If put a vertical cylinder in flow fluid, during the range of Reynolds number will alternate to form a regular vortex behind the cylinder two sides, named as Karman vortex street. The direction of vortex street is inward, up will form a clockwise rotation, down will form a counter-clockwise rotation, the frequency in single side in proportion to flowrate, in inverse proportion to the diameter of vortex producer, the relationship of them as following: f = St x v / d

In the formula: St-Jack straw Hal number; f-frequency product by single side vortex; v-flowrate; d-diameter.

Instrument parameters K: a ratio of separation, pulse amount of vortex to the volume amount: K= N / V

In the formula: K-instrument coefficient (pulse 1/m³); N-pulse number (time); V-volume amount

The relationship between the vortex separation frequency and liquid flow is as follows: f=K x Q

In the formula: f-frequency (time); Q-flow(m³/h)

By testing the vortex separation frequency, the liquid flow in the pipe can be measured.