『The principle of vortex flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. What is the difference between a vortex flowmeter and an electromagnetic flowmeter?
The difference between a vortex flowmeter and an electromagnetic flowmeter is as follows:
1. Measurement principle. Vortex flowmeter: It uses the phenomenon of vortex generated by the flow of the vortex vane with the fluid, and calculates the flow rate of the fluid by measuring the rotation frequency or speed of the vortex vane.
. Electromagnetic flowmeter: Using the principle of electromagnetic induction, it measures the electromotive force experienced by a conductive fluid flowing in a magnetic field, thereby measuring the flow rate of the fluid. From the perspective of the original pronunciation, the difference between the two is obvious.2. Structural form: Vortex flowmeter: composed of vortex generator, piezoelectric element, guide element and magnetic circuit part.
. The transmitter housing is made of steel plate or aluminum alloy plate by integral die-casting, and the body and sensor are combined into an integrated unit instrument. Electromagnetic flowmeter: composed of a conductive tube, excitation coil, housing, and electrodes, with secondary meters installed at the upper and lower ends of the electrodes.III. Vortex flowmeter: it is mainly used to measure the flow of liquid, steam and gas, but it is not applicable to viscous liquid, granular solid medium and liquid containing foam and bubbles. Electromagnetic flowmeter: suitable for measuring the flow rate of various conductive liquids, but cannot measure non-conductive media.
Fourth, output signal vortex flowmeter: usually outputs a standard current signal of 4-20mA.
. Electromagnetic flowmeter: outputting a linear signal propor
2. Working principle of vortex flowmeter
The working principle of vortex flowmeter is based on the Karman vortex phenomenon for flow measurement.
. The following is a detailed explanation of its working principle: The vortex flowmeter is mainly composed of a vortex generator, a detection probe, and corresponding electronic circuits. When a fluid flows through a vortex generator (such as a cylinder), two alternating rows of vortices are formed on both sides, which are called Karman vortex streets. The formation of Karman vortex street is an important phenomenon in fluid dynamics, which manifests as a series of ordered and alternately arranged vortices on both sides of an obstacle when the fluid passes over it. The frequency of vortex separation is directly proportional to the flow velocity of the sluggish fluid and inversely proportional to the width of the vortex generator. This relationship can be represented by a specific formula, where the vortex separation frequency f, dimensionless constant St (Strouhal number), average fluid velocity V in the pipeline, upstream face width d of the cylinder, and inner diameter D of the sensor housing are all key parameters that affect the measurement results. The Strouhal number St is a function of the Reynolds number Re for a specific type of vortex in a certai
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