How to measure the total flow rate of a vapor-water mixture
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How to measure the total flow rate of a gas and water mixture after mixing
After mixing, everything turns into a liquid phase; isn’t the total flow just steam plus water?
The mass flow rate measured by a mass flow meter is independent of whether it is a gas or a liquid. It’s just that the conversion results show different standard flow rates for gases or liquids across various ranges
The common names for mass flow meters are rotor flow meters and float flow meters; they are widely used flow meters. It is most widely used for low flow rates; for high flow rates, differential pressure and orifice plates are employed. Its working principle is that as the fluid passes through, it blows a conical float upward; the height to which the float rises corresponds to the flow rate, and by performing calculations, the standard gas flow rate or liquid flow rate of the medium can be determined. The height remains constant; regardless of whether it is a liquid or a gas flowing through, the number of moles is the same
Today’s mass flowmeters can measure mass directly
There are mass flow meters that use vibrations at several thousand hertz for measurement, but they are relatively expensive. Can rotameters also measure two-phase flow?
A mass flow meter is a flow meter that operates on the Gregory principle; it contains neither rotors nor floats. So how can it be related to rotor or float-type flow meters? Accurately measuring gas-liquid two-phase mixed flow is a challenging task. One approach is to measure the flow rates of the gas and liquid separately and then calculate the total flow rate of the mixture. However, using mass flow meters to measure gas-liquid two-phase flows has its limitations; the typical gas-liquid ratio for standard products should not exceed 5%. In special cases, it is possible to measure gas-liquid mixtures with a gas content of 25%, but no higher than that. There is no instrument that can handle all situations. From a practical standpoint, branded products or Emerson’s MICRO MOTION models perform better, as they are established brands. Domestic instruments are simply not suitable for measuring gas-liquid mixtures. .