Where is a mass flowmeter usually used? |venturi meter

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1. What is Coriodolli? How does the Coriolis flowmeter work?

Principle of Mass Flow Measurement: The measurement system of a mass flow meter includes a sensor and a transmitter for signal processing.. According to Newtons second law: force=mass x acceleration (F=ma), when a particle with a mass of m moves in a pipeline rotating at an angular velocity ω about the P axis at a velocity V, the particle experiences two components of acceleration and their forces:

(1) normal acceleration, i.e. centripetal acceleration α r, with a magnitude equal to 2 ω r, facing the P axis;

(2) Tangential angular velocity α t, also known as Coriolis acceleration, has a value equal to 2 ω V and is perpendicular to α r. Due to composite motion, a Coriolis force Fc=2 ω Vm acts on the particle in the α t direction, and the pipeline exerts a reverse force Fc=-2 ω Vm on the particle. When a fluid with a density of ρ flows at a constant velocity V in a rotating pipeline, any section of the pipeline with a length Δ x will experience a tangential Coriolis force Δ Fc: Δ Fc=2 ω V ρ A Δ x

(1), where A represents the cross-sectional area of the pipeline. Due to the existence of the relationship equation: qr=ρ VA, Δ Fc=2 ω qm Δ x

(2) Therefore, directly or indirectly measuring the Coriolis force of the fluid flowing in a rotating tube can determine the mass flow rate. Inside the sensor is a U-shaped flow tube. When there is no fluid flowing through the flow tube, the flow tube is driven by an electromagnetic drive coil installed at the end of the flow tube, with an amplitude of less than 1mm and a frequency of about 80Hz. When the fluid flows into the flow tube, it is forced to accept the vertical movement of the fl

ow tube. During the half cycle of upward vibration of the flow tube, the fluid resists the upward movement of the tube and exerts a downward force on the flow tube; On the contrary, the fluid flowing out of the flow tube exerts an upward force on the flow tube to resist its downward movement and reduce its vertical momentum. This causes the flow tube to twist, and during the other half of the vibration cycle, the flow tube vibrates downwards in the opposite direction. This twisting phenomenon is called the Coriolis phenomenon, or Coriolis force. According to Newtons second law, the amount of distortion in a flow tube is directly proportional to the mass flow rate passing through it. Electromagnetic signal detectors installed on both sides of the flow tube are used to detect the vibration of the flow tube. When no fluid flows through the flow tube, the flow tube does not twist, and the detection signals of the electromagnetic signal detectors on both sides are in phase (Figure 3); When fluid flows through the flow tube, the flow tube is twisted, resulting in a phase difference between the two detection signals. The magnitude of this phase difference is directly proportional to the mass flow rate flowing through the flow tube. Due to the fact that this type of mass flowmeter mainly relies on the vibration of the flow tube for flow measurement, the vibration of the flow tube and the impact force of the fluid flowing through the pipeline generate Coriolis force, causing each flow tube to twist. The amount of twist is proportional to the mass flow velocity flowing through the flow tube during the vibration cycle. Due to the distortion of one flow tube lagging behind that of another, the output signal of the sensor on the qual

1. What is Coriodolli? How does the Coriolis flowmeter work?

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