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1. Experimental principle and calculation formula of Venturi flowmeter
Venturi flowmeter is a throttling flow sensor based on the Venturi effect. The principle is that when the fluid flows in the pipeline, the flow velocity will increase and the static pressure of the fluid will decrease by reducing the flow cross-section, resulting in a pressure difference before and after the throat of the Venturi tube. The magnitude of this pressure difference is directly proportional to the fluid flow rate, which is used to measure the flow rate. The design basis of the Venturi flowmeter is the fluid flow continuity equation and Bernoulli equation. Among them, Bernoullis principle states that the sum of kinetic energy, gravitational potential energy, and pressure potential energy is a constant. When flowing at the same height, the flow velocity increases and the pressure decreases. The measurement formula of the Venturi flowmeter is as follows: there is a Bernoulli principle expression at points 1 and 2, and if the flow field and fluid properties at any point in the pipeline remain unchanged, then the water mass remains unchanged and the flow rate is equal. Through formula processing, the relationship between flow rate and the diameter, density, gravity plus the speed of the stool wheel mold, and pressure head difference of the Venturi tube is obtained. Combine the above relationships and obtain expressions for flow velocity and flow rate by solving. Finally, the flow formula is: flow Q=theoretical flow rate - slow Q theory x flow coefficient μ. By experimentally measuring the actual flow rate and head difference, the flow coefficient can be obtained. The experimental steps include recording the experimental constant, adju
2. Why is the Venturi flowmeter p1-p2=ρ gh? The Venturi flowmeter is a flowmeter based on the principle of differential pressure, used to measure the flow rate of fluid in pipelines. In the Venturi flowmeter, the differential pressure (△ P) is measured through two pressure measuring points (P1 and P2) in the pipeline. Under ideal conditions, the differential pressure △ P can be calculated using the following formula: △ P=ρ gh. Among them, ρ is the density of the fluid, g is the gravitational acceleration, and h represents the vertical height difference between the two pressure measuring points P1 and P2. This formula can be explained by the following principle:
1. The reason for pressure difference: When fluid flows in a pipeline, frictional resistance is generated. When the fluid passes through a constricted section (usually a throat), the flow velocity increases and the pressure decreases.
. Differential pressure △ P is the pressure difference that occurs due to changes in fluid velocity.2. Static pressure of fluid: When there is no flow, the pressure distribution of the fluid is uniform, which is static pressure. In a horizontal pipeline, due to the effect of gravity on the fluid, the static pressure of the fluid is the same. But at two different positions at different vertical heights, due t
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