A Vortex Flow Meter is an instrument used to measure the flow rate of a fluid. It operates based on the principle of the Von Kármán effect, which states that when a fluid flows past an obstruction, it creates vortices that alternate on either side of the obstruction.
A vortex flow meter consists of a bluff body (such as a circular cylinder) placed in the flow stream. As the fluid flows past the bluff body, vortices are created, which cause pressure fluctuations in the fluid. These pressure fluctuations are proportional to the flow rate of the fluid and can be measured by pressure sensors located downstream of the bluff body.
The advantages of vortex flow meters include their high accuracy, their ability to measure flow rates in both liquids and gases and their relatively low cost compared to other flow meters. They are commonly used in applications such as water and wastewater treatment, HVAC systems, and process control in industrial plants.
However, vortex flow meters may not be suitable for applications where the fluid contains solid particles or where the flow rate is very low. Additionally, they may require periodic calibration to maintain their accuracy, and their accuracy may be affected by changes in fluid temperature and viscosity.
Vortex Flow Meter 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 “von Karman vortex”.
Since both sides of the vortex generator alternately generate the vortex, pressure pulsation is generated. It 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. The signal is the same frequency as the vortex, under the action of alternating stress.
Furthermore, the signal is sent to the intelligent flow totalizer to be processed after being amplified by the pre-amplifier. It will realize displaying instantaneous flow and cumulative flow of fluid, communicating and controlling flow data and the microcomputer system.
In conclusion, a certain range of Reynolds number (2×10^4~7×10^6), the relationship among vortex releasing frequency fluid velocity V.
It also has a vortex generator facing flow surface width d can be expressed by the following equation:
Vortex Flow Meter Features
- The unique isolated sensor design allows for replacement without breaking the process seal
- Increase plant availability and reduce potential leak points with a gasket-free meter body with no moving parts
- Eliminate downtime and maintenance costs associated with plugged impulse lines with a non-clog meter body design
- Achieve vibration immunity with a mass balanced sensor and Adaptive Digital Signal Processing with visual filtering
- A standard internal signal generator included in every meter simplifies electronic verification
- All meters arrive pre-configured and hydrostatically tested, making them ready and easy to install
- Simplify SIS compliance with available dual and quad Vortex
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