Principle of Wedge Flow Meter | Doppler Open Channel Flow Meter

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1. Overview of Wedge Flow Meter

Its detection component is a V-shaped wedge block (also known as a wedge-shaped throttling element), with its smooth top angle facing downwards, which is conducive to the smooth passage of liquids or viscous liquids containing suspended high cherry finger particles, without causing stagnation on the upstream side of the throttling element. Therefore, it is particularly suitable for use in industries such as petroleum and chemical for measuring volumetric and mass flow rates.

2. Why cant a globe valve be directly installed on the front end of a wedge flowmeter? Wedge flowmeter is a flowmeter that utilizes the principle of conversion between dynamic pressure energy and static pressure energy: (throttling type) In the same closed pipeline, when the fluid flows rapidly and the velocity increases, its static pressure energy will be converted into dynamic pressure energy. So in the same closed pipeline, the higher the flow velocity, the lower the static pressure. By installing a throttling element in the fluid pathway to increase the flow rate of the fluid passing through it, a static pressure zone with different pressures will be formed before and after the throttling element. The square of the pressure difference (differential pressure) is proportional to the flow rate. By measuring the differential pressure and taking the square root, the flow rate value can be obtained. The throttling element of a wedge flowmeter is a wedge-shaped protrusion on the pipe wall, and the flow rate can be determined by measuring the pressure difference before and after the protrusion when the fluid passes through it. Due to the relationship between differential pressure and flow rate being obtained through experiments and calculations on the basis of a straight pipe section, its parameters are determined based on the fluid flow characteristics in the straight pipe. Installing elbows, tees, valves, insertion components, etc. at the front end of the flowmeter will affect the flow characteristics of the fluid, so a certain amount of straight pipe section must be left. The length of the straight pipe section of a wedge-shaped flowmeter is generally 5-20 diameter lengths, which can be found in the flowmeter manual.

3. Main Features and Parameters of Wedge Flow Meter

Wedge flow meter is a high-precision flow measurement instrument suitable for complex working conditions, with strong anti-interference ability, high reliability, and low maintenance cost. It is suitable for measuring fluids with high viscosity, particles or bubbles.

First, its main features are suitable for complex media, especially for high viscosity, low Reynolds number (lower limit of 300) fluids such as heavy oil, asphalt, resins, etc. It can measure media containing suspended particles or bubbles (such as sewage and mud), with a specially designed wedge-shaped structure that has a guiding effect and effectively prevents blockage. Strong anti-interference ability, measurement accuracy not affected by fluid dielectric constant, conductivity and other characteristics, suitable for non-conductive or poorly conductive media. Equipped with automatic compensation function for fluid viscosity, temperature, and density changes, ensuring measurement stability. High reliability and durability, anti vibration and anti impact: suitable for di

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