Vortex flowmeter Fundamentals - Kamen vortex theory explained

vortex flowmeter

Vortex flowmeter Fundamentals - Kamen vortex theory explained

2025-01-06

Vortex flowmeter based on Kamen vortex theory, the use of fluid through the non-streamlined objects generated by the vortex phenomenon to measure the flow.

Vortex flowmeter, as a precision measuring instrument widely used in industrial production, environmental monitoring and energy management, the core principle behind it is the famous Karman vortex theory. Below, we will explain this theory and its application in vortex flow meters in detail in easy-to-understand language.

First, let’s start with what a vortex flowmeter is. A vortex flowmeter is an instrument that uses the vortex phenomenon generated when fluid passes through a non-streamlined object to measure flow. Its core component is usually a columnar or streamlined object called a "vortex generator".

So, what is Karman vortex street theory? This theory was proposed by Hungarian-American scientist Theodore von Kármán in 1911. When studying the flow of fluid around obstacles such as cylinders, he discovered that when the flow velocity reaches a certain value, two rows of vortices will periodically alternate behind the obstacle. This regular vortex row is called a "vortex street." . The frequency of this vortex street has a certain relationship with the speed of the fluid and the geometry and size of the obstacles.

In the vortex flowmeter, this "vortex generator" acts as an obstacle in the above theory. When a fluid (such as water, gas or steam) flows through a vortex generator, a series of vortices are formed according to Karman's vortex street theory. The frequency of vortex shedding is directly related to the fluid velocity, and this frequency can be detected by a sensor and converted into an electrical signal to calculate the volumetric flow rate of the fluid.

In summary, the vortex flowmeter cleverly uses the Karman vortex theory to indirectly reflect the flow rate of the fluid by measuring the frequency of vortex shedding, thereby achieving accurate measurement of flow. This measurement method has the characteristics of good stability, high accuracy, and wide application range. It is an indispensable flow measurement tool in modern industrial production and scientific research activities.

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