Ultrasonic flow meter flow measurement method and instrument selection

Abstract: Ultrasonic flow meter flow measurement method and instrument selection information are provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. Ultrasonic flowmeter flow measurement method and instrument selection Although the flow rate of pulsating flow in the measurement section is a function of time, it has a constant average flow rate within a long enough period of time. Pulsating flow is a type of unsteady flow. There are two types of pulsating flow. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the ultrasonic flowmeter flow measurement method and the selection of the instrument. Ultrasonic flowmeter flow measurement method and instrument selection Although the flow rate of pulsating flow in the measurement section is a function of time, it has a constant average flow rate over a long enough period of time. Pulsating flow is a type of unsteady flow. There are two types of pulsatile flow: periodic pulsatile flow and random transition pulsatile flow. exist. The causes of pulsating flow in r_t pipe flow may be: ① prime mover, such as reciprocating engine, compressor, pump, fan, etc.; ② frequent action of control valve; ③ pipeline self-excited oscillation, especially when there is resonance ④ Process pipe fittings, such as thresholds, elbows, branch pipes, etc., cause flow separation; ⑤ Caused by the layout of the entire flow system; ⑥ Caused by certain flow patterns in the mixed-phase flow. Ultrasonic flowmeter when the critical flow fluid flows through a certain throttling part. Flow in which the ratio of absolute downstream to upstream absolute pressure is equal to or less than a critical value, when there is a critical cross-section in the throttling member, usually at the throat. at the critical section. The flow velocity will reach the speed of sound, and further reduction of the downstream pressure will not increase the mass flow rate, so this flow is also called choked flow. Not only the gas has a critical flow, but the liquid also has a critical flow, because when the pressure decreases to reach the saturated vapor pressure, a cavitation will be formed, which will block the liquid flow. At this time, the downstream pressure will not increase the flow. In the above case, the flow can only be increased by increasing the upstream pressure. Ultrasonic Flow Meter Mixed-Phase Flow Mixed-Phase Flow——Two-phase (gas-liquid, gas-solid and liquid-solid) or multiphase (gas-liquid circle) flows in various sectors of the national economy, such as boilers, prismatic reactors, oil and gas field exploitation and transportation, chemical equipment, refrigeration, low temperature and cooling in steel plants And vaporization, solid material pipeline transportation, etc. exist in large numbers. The mixed-phase flow has the following characteristics. ① The flow structure forms (referred to as flow patterns) are complex and diverse, as shown in Figure 25. It has different hydrodynamic and heat transfer properties, so determining its flow pattern in the study of two-phase flow is as important as determining whether it is laminar or turbulent in single-phase flow. ②The flow is often accompanied by the phase transition of heat transfer and mass transfer, and the critical point of the phase transition is closely related to the pressure and temperature, so the stability of the pressure and temperature in the mixed cap flow is extremely important. ③ The fluid often has the characteristics of adhesion, easy clogging and corrosion of the instrument. Strict requirements are placed on the test pieces. ④ There are many factors that affect the flow pattern, such as the installation direction of the pipeline (horizontal or vertical), flow rate, density, viscosity, surface tension, pressure, temperature, pipe diameter, etc., so it is still difficult to identify the flow pattern. ⑤ In the horizontal and vertical pipelines, the flow patterns and the mathematical models described are different, and there are strict requirements for the selection of sampling points and the installation of detection parts. ⑥ The instantaneous flow of mixed-phase flow is unstable, and generally only the average flow over a period of time can be measured. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Ultrasonic flow meter flow measurement method and instrument selection'

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