『Formula derivation 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)
1. Experimental principle and calculation formula of Venturi flowmeter
The experimental principle of Venturi flowmeter is based on the Venturi effect and Bernoullis law, and the calculation formula mainly involves the calculation of flow rate Q. Experimental principle: Venturi effect: When a fluid passes through a gradually contracting pipeline, the flow velocity will significantly increase. This is due to the decrease in cross-sectional area of the pipeline, which causes the fluid to accelerate in order to maintain continuity. Bernoullis law: In constant flow, an increase in velocity is accompanied by a decrease in pressure. The Venturi tube utilizes this principle to calculate flow rate by measuring the pressure difference between the Zen chain stop before and after the contraction section. Calculation formula: Basic flow formula: Without considering resistance, the flow rate Q can be calculated by the inner diameter d of the pipeline, the flow velocity difference, and the head difference Δ h. The formula is Q=d2/Δ h. However, please note that v1 and v2 refer to the flow velocity before and after the contraction segment, respectively, and this formula is a theoretical value. In practical applications, resistance needs to be considered. Actual flow formula: Due to the presence of resistance in the actual pipeline, the actual flow rate Q will be lower than the theoretical value. Therefore, it is necessary to introduce the flow coefficient μ for correction, with the formula Q=Q theory/μ. The value of μ is calculated by experimentally measuring the flow rate and head difference. When conducting experiments with a Venturi flowmeter, it is necessary to follow certain steps and pay attention to relevant matters to
2. Formula derivation of Wenqiu Li flowmeter
Vs=CvAo (2 (Pa Po)/ρ) ^ 0.5Cv flow coefficient, with a dimension of one.
. The unit of pressure difference between the upstream pressure measuring port (at the inlet pipeline) and the minimum flow cross-section of the Pa Po flowmeter (at the isolated Wen throat) is Pa. The cross-sectional area of the Ao throat is, m^2。 ρ b is the density of the measured fluid, Kg/m^3。 Extended information: The new generation of differential pressure flow measurement and macro measurement instruments is based on the energy conservation law - Bernoulli equation and flow continuity equation as the basic measurement principles of flow measurement methods. The inner tube is composed of a circular measuring tube and a special core body placed inside the measuring tube and coaxial with the measuring tube. The radial outer surface of the special core has a geometric profile similar to the inner surface of the classical Venturi tube, and forms a reduced diameter annular flow gap with the inner surface of the measuring tube. The throttling process of fluid flowing through an inner Venturi tube is basically similar to the throttling process of fluid flowing through a classical Venturi tube and an annular orifice plate. The structural characteristics of the inner cavity tube prevent sharp edge abrasion and fouling problems similar to orifice plate throttling components during use, and enable effective flow adjustment (rectification) of the gradient pulsation of fluid velocity distribution and possible non axisymmetric velocity distribution inside the tube before throttling, thereby achieving high accuracy and stability in flow measurement.
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