A Vortex flowmeter is a type of flowmeter used for measuring fluid flow rates in an enclosed conduit.[1]
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A vortex flowmeter has the following components: 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.[2]
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 "von Kármán 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 frequency of these pulses is directly proportional to flow rate. The signal is sent to the intelligent flow totalizer to be processed after being amplified by the pre-amplifier.
In certain range of Reynolds number (2×10^4~7×10^6), the relationship among vortex releasing frequency, fluid velocity, and vortex generator facing flow surface width can be expressed by the following equation:[3]
f = S t × V d {\displaystyle f={\frac {St\times V}{d}}} where f {\displaystyle f} is the releasing frequency of Carmen vortex, S t {\displaystyle St} is the Strouhal number, V {\displaystyle V} is velocity, and d {\displaystyle d} is the width of the triangular cylinder.[4]
The 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. The vortex flowmeter is relatively economical because of its simple flow measurement system and ease of maintenance. It is widely used in heavy industrial applications, power facilities, and energy industries, particularly in steam processes.[5]
Rosemount™ MultiVariable and Quad Vortex Flow Meters: A superior solution for compensated steam and redundant flow measurement
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Steam applications are well known for their relentless demands and their inherent safety risks. With unparalleled features like the ability to perform maintenance any time without shutting down the process and the ability to compensate for changing process condi-tions, the Rosemount Vortex Flow Meter knows how to go to work for you and your operations.
The powerful combination of the Rosemount Multivariable Vortex Flow Meter with an integrated temperature sensor paired with a Rosemount S Pressure Transmitter delivers reliable pressure and temperature compensation for your mass flow measure-ments in superheated steam applications.
The Rosemount Quad Vortex is designed for SIS applications and provides the ut-most reliability to guard against spurious trips using two out of three voting and includes a fourth integrated transmitter for process control. The Quad Vortex removes installation complexity in an elegant solution you can quickly bolt in, wire up, and go.
Rosemount™ MultiVariable and Quad Vortex Flow Meters: A superior solution for compensated steam and redundant flow measurement
Steam applications are well known for their relentless demands and their inherent safety risks. With unparalleled features like the ability to perform maintenance any time without shutting down the process and the ability to compensate for changing process condi-tions, the Rosemount Vortex Flow Meter knows how to go to work for you and your operations.
The powerful combination of the Rosemount Multivariable Vortex Flow Meter with an integrated temperature sensor paired with a Rosemount S Pressure Transmitter delivers reliable pressure and temperature compensation for your mass flow measure-ments in superheated steam applications.
The Rosemount Quad Vortex is designed for SIS applications and provides the ut-most reliability to guard against spurious trips using two out of three voting and includes a fourth integrated transmitter for process control. The Quad Vortex removes installation complexity in an elegant solution you can quickly bolt in, wire up, and go.