Ultrasonic flow meter scale flow measurement methods and the selection of instrument

Abstract: ultrasonic flowmeter scale flow measurement methods, and selection of instrument information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Ultrasonic flowmeter flow measurement method and instrument selection of pulsating flow within the measuring section flow is a function of time, but in a long enough period with constant flow average. Flow pulsating flow is a kind of steady flow. The pulsating flow can be divided into two. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a ultrasonic flowmeter scale flow measurement method and instrument selection of articles for details. Ultrasonic flowmeter flow measurement method and instrument selection of pulsating flow within the measuring section flow is a function of time, but in a long enough period with constant flow average. Flow pulsating flow is a kind of steady flow. The pulsating flow can be divided into two categories: periodic pulsation flow and random cross the arterial flow. R_t pulsating flow in pipe flow causes may be: (1) prime mover, such as reciprocating engine, compressor, pump, fan, etc; (2) control valve frequent movement of; (3) pipes self-excited oscillation, especially have a resonance; (4) process pipe fittings, such as threshold, elbow, pipe produced by the flow separation; (5) the entire flow system arrangement; 6. Miscible flow in certain flow pattern. Downstream and upstream of the ratio of the absolute pressure is equal to or less than the critical value of flow, then there is a critical section in the throttling parts, it is usually in the throat. Velocity will reach the speed of sound, further reduce the downstream pressure cannot make mass flow rate increases, so the flow is also called blocking the flow. Gas is not only critical flow, liquid also exist critical flow, because of the decrease of the pressure saturated vapor pressure, will form the air-pocket, the blocking effect of fluid flow, the downstream pressure reduce also cannot make traffic increases. In these cases only improve upstream pressure can make traffic increases. Ultrasonic flowmeter miscible flow miscible flow & ndash; — Two phase ( Gas-liquid, gas-solid and liquid-solid) Or multiphase ( Gas liquid ring) Flow in the national economy departments, such as boiler, reactor edges, oil and gas field exploitation and transportation, chemical equipment, refrigeration, cooling and evaporation in low temperature and steel mills, pipe etc. There are a large number of solid materials. Mixed phase flow has the following features. (1) flow structure in the form ( Flow pattern) Complicated, as shown in figure 25. It has a different hydrodynamics and heat transfer characteristics, therefore, in the research of two phase flow in the flow to determine the flow pattern and single-phase flow is as important to determine the laminar or turbulent. (2) flow with phase change of heat and mass transfer, and the critical point of phase transition is closely related to the pressure and temperature, so the mixed cap flow pressure and temperature stability is very important. To detect a stringent requirements are put forward. (4) the factors influencing flow pattern is very much, such as pipe installation direction ( Horizontal or vertical) , velocity, density, viscosity, surface tension, pressure, temperature, pipe diameter, and so on, so still have trouble to date flow pattern identification. (5) in the horizontal and vertical pipes, the mathematical model of flow pattern and its description is different, the selection of sampling points and the installation of the test pieces have strict requirements. 6. Miscible flow of instantaneous flow rate is not stable, normally only over a period of time the average flow rate measurement. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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