Yokogawa Vortex Flow Meter Manual | Yokogawa EJA Vortex Flow Meter Head Can Turn

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What is the Strouhal number of the Yokogawa vortex flowmeter?

Sr is the Strouhal number, which is mainly related to the Reynolds number. When the Reynolds number is between 300 and 3 × 10 ^ 5, the Sr near equilibrium value is similar to a constant value (0.21); When the Reynolds number is between 3 × 10 ^ 5 and 3 × 10 ^ 6, the regular vortex street no longer exists; When the Reynolds number is greater than 3 × 10 ^ 6, the Karman vortex street will automatically appear again, and Sr is about 0.27 at this time. The Strouhal number is not a parameter of a flowmeter, but a characteristic of flow. The Technical Department of Yunnan Xibote Technology Co., Ltd. instructed Yuanpi that recently, the Henghe Vortex Flow Meter used by the unit has been experiencing a situation where there is no flow display of the medium in the pipeline, generally During the use of flow meters, attention should be paid to the adaptability and requirements of installation conditions. Generally, common self regulating vortex street flow meters should be considered from the following aspects before installation, such as the installation direction of the flow meter, the flow direction of the fluid, the configuration of upstream and downstream pipelines, valve position, protective accessories, pulsating flow influence, vibration, electrical interference, and maintenance of the flow meter. ① When wiring on-site pipelines, attention should be paid to the installation direction of flow meters. As the installation direction of flow meters is generally divided into vertical installation and horizontal installation, there are differences in flow measurement performance between these two installation methods. For example, vertical downward flow of fl

uid can cause additional force on the flowmeter sensor, affecting the performance of the flowmeter and reducing its linearity and repeatability. The installation direction of flow meters also depends on the physical properties of the fluid, such as the possibility of solid particles settling in horizontal pipelines. Therefore, it is best to install flow meters with this condition in vertical pipelines. ② The issue of fluid flow direction is similar to the installation direction of flow meters, as some flow meters specify that they can only work in one direction, and reverse flow can damage the flow meter. When using a flowmeter, it is also necessary to consider the possibility of reverse flow when no operation occurs, which requires measures such as installing check valves to protect the flowmeter. Even flow meters that can be used in both directions may have some differences in measurement performance between forward and reverse directions, and should be used according to the requirements specified by the manufacturer. ③ The upstream and downstream straight sections of the flowmeter are affected by the flow state at the inlet of the pipeline, and the pipeline fittings also introduce flow disturbances. Flow disturbances generally include vortices and distorted velocity distribution profiles. The existence of vortices is generally caused by two or more curved pipes in the space (vertical and horizontal bridge bodies). Flow velocity profile distortion is usually caused by local obstructions (such as valves) or bends in pipeline fittings. These impacts need to be improved by installing upstream straight pipe sections of appropriate length or installing flow regulators. In addition to considering the impact of flowmeter conn

Yokogawa Vortex Flow Meter Manual | Yokogawa EJA Vortex Flow Meter Head Can Turn

What is the Strouhal number of the Yokogawa vortex flowmeter?

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