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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
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2. Experimental principle and calculation formula of Venturi flowmeter
Experimental principle and calculation formula of Venturi flowmeter: Venturi flowmeter is a flow measurement device designed based on the basic principles of Venturi effect and fluid mechanics.
. The Venturi effect refers to the increase in fluid velocity when a restricted flow passes through a reduced cross-section, and the velocity is inversely proportional to the cross-section. In a Venturi tube, when fluid flows through the throttling element (i.e. the throat), local contraction occurs, resulting in an increase in flow velocity and a decrease in static pressure, thus creating a pressure difference before and after the throat. There is a direct relationship between this pressure difference and fluid flow rate, so fluid flow rate can be calculated by measuring the pressure difference. Specifically, the working principle of the Venturi flowmeter is based on the continuity equation and Bernoulli equation of fluid flow. The Bernoulli equation describes the relationship between pressure, flow velocity, density, gravitational acceleration, and height at a certain point in a fluid, that is, kinetic energy+gravitational potential energy+pressure potential energy=constant. When the flow velocity is high, the pressure is low, which is an
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