Measurement principle of mass flowmeter | Working principle of Coriolis mass flowmeter (Coriolis force flowmeter)

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1. Principle of mass flowmeter

The principle of mass flowmeter is to use an external heat source to heat the measured fluid inside the pipeline, and reflect the mass flow rate of the fluid by measuring the heat (temperature) changes caused by the fluid flow. Specifically, its principle can be explained from the following aspects:

1. Basic measurement principle: The mass flowmeter heats the fluid through an external heat source, and the thermal energy flows along with the fluid.

. When the fluid flows, it will take away some heat, causing a change in the temperature difference between the heating point and the measured point. There is a certain relationship between this temperature difference and the mass flow rate of the fluid, so the mass flow rate of the fluid can be calculated by measuring the temperature difference.

2. Constant heating power and constant temperature difference method. Constant heating power method: When the composition of the fluid is determined, its specific heat at constant pressure is a known constant. If the heating power is kept constant, the mass flow rate can be calculated based on the known heat transfer formula by measuring the temperature difference between the heating point and the measured point. Constant temperature difference method: Another method is to maintain the temperature difference between the heating point and the measured point constant, and calculate the mass flow rate by measuring the required heating power. Due to its simplicity and ease of implementation, the constant temperature difference method is widely used in practical applications. To avoid contamination and corrosion of temperature measuring and heating elements by the measured fluid due t

o direct contact with the fiber, non-contact measurement methods can be used. This method installs the heater and temperature measuring element outside the thin-walled tube, while the fluid passes through the inside of the thin-walled tube. This can ensure the accuracy of measurement and extend the service life of components. 4. The method of expanding the range is already accurate enough for measuring small flow rates in small-diameter pipelines using non-contact measurement methods. When used for measuring large flow rates, the method of dividing the flow can be adopted, that is, only measuring the flow rate of the divided part, and then obtaining the total flow rate through a certain conversion relationship, thereby expanding the range of measurement. In summary, a mass flow meter can accurately measure the heat (temperature) changes caused by fluid flow, combined with known heat transfer formulas and fluid properties, to accurately determine the mass flow rate of the fluid.

2. Principle of mass flowmeter? The construction principle of a mass flowmeter is based on the continuity principle of fluid flow. By measuring parameters such as flow velocity and density in real time, the mass flow rate of the fluid is obtained from the distribution. The specific principle is as follows: the continuity principle of fluid: when the fluid flows through the pipeline, its flow velocity, density and other parameters will remain relatively stable under certain conditions. This is the foundation of the operation of a quality flow meter. Measurement of flow velocity: Mass flow meters use flow velocity sensors to measure the flow velocity of fluids. These sensors can be vortex flowmeters, ultrasonic flowmeters, etc., which use di

Measurement principle of mass flowmeter | Working principle of Coriolis mass flowmeter (Coriolis force flowmeter)

1. Principle of mass flowmeter

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