Multiphase Fluid Flow Measurement Tasks

The task of multiphase fluid flow measurement Two-phase flow can be divided into two types, one is the flow of the two-phase mixture, that is, the total flow of the two-phase flow, and the other is the flow of each phase, and the sum of the flow of each phase is equal to Two-phase mixture flow. To determine the flow rate of each phase, it is necessary not only to measure the flow rate of the two-phase mixture, but also to measure the content of any one of the two phases in the mixture. Taking the gas-liquid two-phase flow as an example, to determine the mass flow rate of the gas phase and the liquid phase, it is necessary to measure the mass flow rate of the gas-liquid mixture and the flow mass content of the gas phase/?(^. The flow mass content of the gas phase is, by definition, equal to the gas phase The ratio of mass flow rate to gas-liquid mixture mass flow rate. Therefore 9(3 is equal to the product of ^ and ^, and liquid phase mass flow rate is equal to&And the difference between income. Therefore, in order to conduct a complete measurement of the gas-liquid two-phase flow, two parameters generally need to be determined, namely, the flow rate of the gas-liquid mixture and the mass flow content of the gas phase. Some flowmeters, such as electromagnetic flowmeters and ultrasonic flowmeters, whose output signal is only volume flow, are not equipped with density measuring instruments for various reasons when they are used to measure two-phase flow. If the density and density of the light phase and heavy phase are known Flow volume ratio, the average density of the mixture can be calculated by using the formula [53], and then the mass flow rate of the mixture and each phase can be calculated. In actual engineering, due to the diversity of measurement needs, sometimes it is only necessary to measure the mass flow or volume flow of a two-phase mixture, and sometimes it is only necessary to measure the mass flow or volume flow of a light or heavy phase, for example, the gas phase in wet steam , oil in an oil-water mixture. Of course, sometimes due to the limitation of the measuring device or economic reasons, only some parameters in the two-phase flow are measured.

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