『Flow coefficient of Venturi flowmeter』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
Why is the flow coefficient of a Venturi flowmeter less than 1
Because the flow coefficient of a Venturi flowmeter is equal to the ratio of the actual flow rate of the liquid to the theoretical flow rate of the Venturi flowmeter, and the actual liquid experiences head loss during motion, so the actual flow velocity is smaller than that of the Venturi flowmeter. The principle of the flow meter in Wendou Queqiu is that when the wind blows over the obstruction, the air pressure near the port on the leeward side of the obstruction is relatively low, resulting in a large adsorption effect and causing air flow.
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, thereby 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, gravitati
1 and p2 are the pressure at points 1 and 2, v
1 and v2 are the flow velocity at points 1 and 2, ρ is the fluid density, g is the gravitational acceleration, and h
1 and h2 are the heights at points 1 and 2, respectively (which can be ignored in contour flow). Flow continuity equation: Due to the stable flow in the pipeline, the internal flow field does not change over time, and the fluid properties do not change over time. Therefore, the water quality inside the pipeline remains constant, meaning that the flow rate is equal at all points. It can be expressed as: where A
1 and A2 are the cross-sectional areas of the pipeline at points 1 and 2, respectively, and v
1 and v2 are the flow velocities at points 1 and 2, respectively. Calculation of flow velocity and pressure difference: By simplifying and deriving the Bernoulli equation, the relationship between flow velocity v1 and pressure difference Δ p can be obtained. The specific process is as follows: Divide both sides of the Bernoulli equation by ρ g and simplify to obtain the expression for the flow velocity v1. Using the flow continuity equation, represent v2 as a function of v1. Substitute the expression of v2 into the simplified Bernoulli equation and solve for the relationship between v
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