Flow meter test | Doppler effect flow meter

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1. Fluid mechanics problem, Venturi flowmeter, ask the god to take me flying

As shown in the picture, Wenmo Congqiu flow meter is a commonly used device for measuring the blind flow rate of pipelines.

2. There is a flow meter at the end of the pipeline, and argon gas flows out of the pipeline at a speed of 25L/min. The outlet pressure of the flow meter is ..

Argon gas at 0.25MPa, assuming a density of 5.7718kg/m ^ 3 at a temperature of 20 ℃. If the pressure remains constant, the mass flow rate Q for one day is Q=(25 * 60 * 24/1000) * 5.7718=207.8kg. Additionally, the density at 30 ℃ is 5.5794, and at 10 ℃ it is 5.978. Other temperature ranges can roughly estimate the mass of this chamber.

3. Doppler Effect Flowmeters

4. Types and Principles of Flowmeters

Flowmeters are instruments used to measure fluid flow. They can be classified into various types based on the principle of no band state and application scenarios. The following are common types and principles of flow meters: Doppler Ultrasonic Flowmeters Principle: Based on the Doppler effect, when the transmitter has a relative velocity with particles or bubbles in the fluid, the ultrasonic frequency received by the receiver is different from the transmission frequency, and the frequency difference is proportional to the relative velocity. The fluid flow velocity is estimated by measuring the frequency difference. Composition: Transmitter: Generate ultrasonic waves and send them into the fluid. Receiver: Receive ultrasonic waves scattered back by particles or bubbles in the fluid. Signal processor: Analyze the frequency changes of received ultrasound waves and calculate fluid flow velocity based on the Doppler sensitivit

y effect. Characteristics: Accurate, reliable, easy to operate, widely used in the field of flow measurement. Principle of radar flowmeter: Using the Doppler effect, electromagnetic waves are emitted towards the water surface. When the electromagnetic waves encounter the moving water surface, they scatter and form echoes. The received echo frequency is offset from the emission frequency. The water surface velocity can be calculated based on the Doppler frequency equation. The Doppler frequency is proportional to the velocity of motion, and a fixed-point system can be connected to multiple radar probes to calculate the cross-sectional flow rate based on cross-sectional parameters. Features: Fixed point measurement, suitable for flood detection, river flow monitoring, channel flow monitoring, drainage outlet flow monitoring and other scenarios. Principle of mechanical flowmeter: Determine the flow rate by measuring the pressure difference or rotating mechanical components when the fluid passes through the pipeline. Common type: Orifice flowmeter: When a fluid passes through an orifice plate, a pressure difference is generated, and the flow rate is calculated by measuring the pressure difference. Turbine flowmeter: The fluid drives the turbine to rotate, and the turbine speed is proportional to the flow rate. The flow rate is determined by measuring the speed. Liquid column flowmeter: uses the height change of the liquid column to reflect the flow rate. Characteristics: Simple structure, high reliability, but high requirements for fluid properties and flow states. Principle of electromagnetic flowmeter: Using Faradays electromagnetic induction principle, when a conductive liquid passes through an electromagnetic flowmeter,