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what is the basic principal of vertax flow meter
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Answer Posted / 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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