Answer / abhishek k sharma

vortex is natural phenomena occurring when liquid flow
around a bluff object.
For e.g when we throw the stone in water it generates vortex
in round circle.
same happens when a object is placed in between running liquid.
In vortex flow meter same is used and the frequency of
vortex generated is directly proportional to velocity of
liquid flowin.

Answer / rana mujahid

in vortax flow used a restriction in the flow path which
creat the vortax that are directally proportional to the
velocity of flow.and there used a piezoelectric meterial
these vortax strikes on piezo which creates milivoltes which
are directally prpotional to strike rate of vortax..

Answer / www.islamqa.com

Vortex flowmeter is a velocity based flow measurement device.

It consists of a flow tube with "Bluff body"/object with a specific dimensions/shape put in the flow path to generate vortices in the flow stream.

The vortices generation rate is proportional with fluid flowrate, these vortices is hitting a pressure sensor (piezoelectric type), the hitting rate is proportional to the flowrate.

The basic formula for getting fluid velocity:
V=DF/S
D:Bluff body dimension
F:vortices hitting frequency which is measured by pressure sensor.
S:Strouhal No.
Q=A.V, A:Flow path area

Adv. of no moving parts exist so we have high accuracy & stop in case of sudden flow stopping.

Disadv. of low accuracy with low flowrate.

Ahmed Sabry
Instrumentation & Control Engineer
Mob: +2 122 1367310

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