Rotating piston flowmeter | In what situations do scraper type, rotary piston type, and diaphragm type volumetric flow meters operate?

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1. What are the commonly used methods for measuring fluid flow velocity and what are their working principles?

Various flow meter principles and classifications. Flow meters using the principle of volume integration: (volumetric) The measurement principle of this type of flow meter is similar to using a small cup to measure the volume of liquid in a large container multiple times It is achieved by causing fluid to enter a fixed size space during the flow process, and pushing this space to move along the direction of fluid motion to a certain position before flowing out When this process continues, the flow rate can be obtained by counting the number of spaces passed through The flow meters that work based on this principle include: elliptical gear flow meter, waist wheel (Roots) flow meter, scraper (cam, concave line) flow meter, rotary piston flow meter, and disc flow meter Wet flowmeter and skin bag flowmeter are flow meters that utilize the principle of converting dynamic pressure energy and static pressure energy: (throttling type) In the same closed pipeline, when the fluid flow velocity increases, its static pressure energy will be converted into dynamic pressure energy So in the same closed pipeline, the faster the flow rate, the lower the static pressure By installing a throttling element in the fluid path to increase the flow rate of the fluid passing through the throttling element, a static pressure zone with different pressures will be formed before and after the throttling element. The square of the pressure difference (differential pressure) is proportional to the flow rate. By measuring the differential pressure and taking the square root, the flow rate value can be obtained. Flowmeters that work

according to this principle include orifice flow meters, nozzle flow meters, 1/4 circular nozzle flow meters, Venturi tube flow meters, V-plug tube flow meters, laminar flow meters, and weir flow meters. Flowmeters that use the principle of fluid dynamic pressure: the energy that a moving fluid maintains its flow is called dynamic pressure energy The dynamic pressure energy of a fluid is related to its flow velocity. When the motion state of the fluid is changed, the dynamic pressure energy of the fluid is converted into dynamic pressure and applied to an object that changes the motion state of the fluid. By detecting the force acting on this object or directly measuring the dynamic pressure, the flow velocity can be obtained, and the flow rate value can be obtained Flow meters that work based on this principle include target flow meters, baffle flow meters, pitot tube flow meters, constant velocity tube (Anubadi tube) flow meters, and dynamic pressure tube flow meters. Flow meters that use the principle of fluid centrifugal force: When an object moves in a circular motion, centrifugal force is generated. With a constant mass and circular radius of the object, the magnitude of centrifugal force corresponds to the velocity of the object, and the same applies to fluids By passing the fluid through a circular bend and measuring the pressure difference between the inside and outside of the bend, the flow velocity can be obtained, and the flow rate value can be obtained accordingly Flowmeters that work based on this principle include bent tube flowmeters, annular tube flowmeters, and flow meters that use the principle of fluid momentum and torque. (Turbine type) When a fluid encounters a blocking surface at a certain angle t

Rotating piston flowmeter | In what situations do scraper type, rotary piston type, and diaphragm type volumetric flow meters operate?

1. What are the commonly used methods for measuring fluid flow velocity and what are their working principles?

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