Venturi flowmeter flow coefficient | pipeline flowmeter

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1. The actual flow calculation formula of the Venturi flowmeter is 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 (inlet pipeline) of the Pa Po flowmeter and the minimum flow cross-section of the flowmeter (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。 Additional information: The basic measurement principle of the new generation differential pressure flow meter is based on the law of conservation of energy - the Bergman equation and the flow continuity equation. The Venturi tube consists of a circular measuring tube and a special type of core inserted into the measuring tube, coaxial with the measuring tube. The radial outer surface of the special core has a geometric shape similar to the inner surface of the classical Venturi tube, forming a reduced annular flow gap between the core and the inner surface of the measuring tube. The throttling process of fluid flowing through a Venturi tube is basically similar to the throttling process of flowing through a classical Venturi tube or annular orifice plate. Due to the structural characteristics of the Venturi tube, there are no similar issues of sharp edge wear and contamination caused by orifice plate throttling during use. The fluid velocity gradient and possible axisymmetric flow velocity distribution in the throttling tube can be effectively adjusted (rectifier) to achieve high-precision and high rough lift stable flow measurement. Reference source: Baidu Baike - Flow Calculation

2. Pipeline flowmeter

3. Venturi tube flow calculation

Venturi tube flow calculation adopts

the standard formula derived from Bernoulli equation and continuity equation, and the core parameters are upstream and downstream pressure difference, throat cross-sectional area, and flow density. 1. The core calculation formula for the volumetric flow rate (Q) of a Venturi tube is: Q=C_d × A ₂ × √ {[2 × (P ₁ - P ₂)]/[ρ× (1- (A ₂/A ₁) ²)]}, where: • C_d: Discharge Coefficient, which needs to be obtained through real flow calibration. Ideally, it is about 0.98, and the actual value depends on the specific geometry and Reynolds number of the pipeline. • A ₁: Upstream pipeline cross-sectional area (m ²) • A ₂: Throat cross-sectional area (m ²) • P ₁: Static pressure measured at the upstream pressure tap (Pa) • P ₂: Static pressure measured at the throat pressure tap (Pa) • ρ: Fluid density (kg/m ³) 2. Key calculation steps 2.1 Measuring pressure difference: Accurately measure the static pressure difference between the upstream and throat using a high-precision differential pressure transmitter or U-tube differential pressure gauge Δ P=P ₁ - P ₂

2.2 Determine geometric parameters to accurately measure the inner diameter of the upstream pipeline (D ₁) and the inner diameter of the throat (D ₂), and Calculate the corresponding cross-sectional area: A ₁=π× (D ₁/2) ² A ₂=π× (D ₂/2) ² 2.3 Obtain fluid properties by looking up a table or obtaining the density (ρ) of the fluid under current operating conditions through sensors. For compressible fluids (such as gases), it is necessary to introduce the coefficient of expansion (ε) for correction, and the formula will be more cumbersome.

2.4 The selection of flow coefficient and flow coefficient, C_d, is the key to accurate calculation. The coefficient must be selected ba

Venturi flowmeter flow coefficient | pipeline flowmeter

2. Pipeline flowmeter

3. Venturi tube flow calculation

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