Vortex flowmeter is a flowmeter for measuring fluid flow rates in an enclosed conduit.
Video Vortex flowmeter
Composition of vortex flowmeter
A vortex flowmeter comprising: a flow sensor operable to sense pressure variations due to vortex-shedding of a fluid in a passage and to convert the pressure variations to a flow sensor signal,in the form of an electrical signal;and a signal processor operable to receive the flow sensor signal and to generate an output signal corresponding to the pressure variations due to vortex-shedding of the fluid in the passage.
Maps Vortex flowmeter
Working principle
When the medium flows through the Bluff body at a certain speed,an alternately arranged vortex belt is generated behind the sides of the Bluff body,called the"Carmen vortex". Since both sides of the vortex generator alternately generate the vortex,the pressure pulsation is generated on both sides of the generator,which makes the detector produce alternating stress.The piezoelectric element encapsulated in the detection probe body generates an alternating charge signal with the same frequency as the vortex,under the action of alternating stress.The signal is sent to the intelligent flow totalizer to be processed after being amplified by the pre-amplifier,realizing displaying instantaneous flow and cumulative flow of fluid,communicating and controlling of flow data and the microcomputer system.
In certain range of Reynolds number(2×10^4~7×10^6),the relationship among vortex releasing frequency f,fluid velocity V and vortex generator facing flow surface width d can be expressed by the following equation:
f=Sr×V/d V=f×d/Sr
In the equation,f-releasing frequency of Carmen vortex,Sr -coefficient(called the Strouhal number),V-velocity, d-width of the triangular cylinder.
Industrial applications
Vortex flowmeter is a broad-spectrum flow meter which can be used for metering,measurement and control of most steam,gas and liquid flow for a very unique medium versatility,high stability and high reliability with no moving parts,simple structure and low failure rate.And The flowmeter is relative economical because of its simple flow measurement system and easy to maintain,widely used in petroleum,chemical industry,metallurgy,food,paper,electricity, industry boiler,urban pipeline heating,water supply,coal gas and other industries.
Vortex flowmeter introduction
References
External links
- Specific flow calculation examples based on a certain range of Reynolds number.
Source of the article : Wikipedia
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