When the fluid flows through the Verabar flowmeter probe, a high pressure distribution zone is created at the front of it, and the pressure in the high pressure distribution zone is slightly higher than the static pressure of the pipeline. According to the principle of Bernoulli's equation, the velocity of the fluid flowing through the probe is accelerated, and a low pressure distribution area is generated at the rear of the probe. The pressure in the low pressure distribution area is slightly lower than the static pressure of the pipeline.

After the fluid flows from the Verabar flow meter probe, a partial vacuum is generated at the rear of the probe, and vortices appear on both sides of the probe. The Veloba flowmeter average flow rate probe can accurately detect the average differential pressure generated by the average velocity of the fluid. .

Veliba flowmeters follow Bernoulli's equations just like other differential pressure flowmeters

qV=KCΔp (1)

Where qV———the volume flow of the fluid;

K———flow coefficient;

C———Flow constant (constant);

Δp—The differential pressure produced by the differential pressure generator.

C is a constant. To determine qV, K and Δp must be determined.

Based on aerodynamics, fluid mechanics theory, boundary layer theory, and actual fluid test data, the Verabar flowmeter has been pioneering the establishment of K's mathematical analysis model for flow probes.

K=1/[1/(1-CbβV)+C] (2)

Where Cb———the boundary layer coefficient;

βV—blocking factor.

This is a supplement to the specific application of Bernoulli's equation theory.

1) The accuracy of K is as high as +0.5%, as confirmed by the world-renowned independent flow laboratory.

2) K is linear, its change has nothing to do with the change of Reynolds number, guarantee the measurement result can reach +0.5% of the accuracy under the range ratio higher than 10:1.

3) The flow coefficient of Verabar flowmeter is more accurate and easier to know than other flowmeters.

The accuracy and stability of the Verabar flowmeter Δp depends on the unique scientific design of the Verabar flowmeter:

1) The shape of the probe is subject to the least traction, so that the separation point of the fluid and the probe is fixed.

2) The Verabar flowmeter adopts a complete metal cavity structure, which avoids leakage between chambers caused by the three-piece structure of other probes, increases the strength of the probe, and ensures its accuracy.

3) The low-pressure hole is taken on the back side of the probe side, before the probe and the fluid separation point, the low pressure hole is prevented from being affected by the eddy current, and the low-pressure hole is prevented from being blocked, so that the low-voltage signal is more stable and the measurement is more accurate.

4) Surface roughening and anti-slurry: Control the interface layer. At various flow speeds, the fluid in the interface layer on the probe surface is a turbulent layer, ensuring that the probe can obtain stable and accurate signals when the fluid is at a low flow rate.

5) The Verabar flowmeter probe is used to take pressure through multiple pressure-receiving holes through the entire section of the fluid in the pipe. The pressure hole spacing is obtained after area integration. The measured signal is a true signal reflecting the average fluid velocity.

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