Vortexmittarit

Vortexmittarit, also known as vortex flowmeters, are devices used to measure the flow rate of fluids, both liquids and gases. They operate on the principle of vortex shedding, a phenomenon where alternating vortices are shed from a bluff body placed in a flowing fluid. The frequency at which these vortices are shed is directly proportional to the flow velocity of the fluid.

The primary component of a vortexmittari is a bluff body, often shaped like a V-shaped or rectangular shedder bar, which is inserted into the pipeline. As the fluid flows past this body, it creates turbulent wakes on alternating sides. These disturbances cause the formation and shedding of vortices. A sensor, typically a piezoelectric or capacitive element, is positioned downstream of the shedder bar to detect these pressure fluctuations caused by the passing vortices.

The frequency of vortex shedding is measured by the sensor and then converted into a flow rate using a calibration factor. The relationship between shedding frequency and flow velocity is generally linear over a wide range of flow conditions. Vortexmittarit are known for their robustness, lack of moving parts (apart from the fluid itself), and ability to handle a wide range of temperatures and pressures. They are commonly used in industrial applications such as process control, steam measurement, and water flow monitoring due to their reliability and relatively low cost. However, they can be sensitive to upstream flow disturbances, requiring adequate straight pipe runs before and after the meter for accurate readings.