『Calculation of orifice flow rate』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Calculation of Orifice Flow Meter
The core calculation formula of an orifice flow meter is qv=C × ε× A0 × √ (2 Δ p/ρ), and the calculation result directly reflects the flow rate.
1. Basic Parameter Analysis 1 Outflow coefficient C: It is related to the geometry of the orifice plate and the pressure measurement method, and needs to be obtained through experiments or by referring to standard charts. two The coefficient of expansion ε: for liquids, it is set to 1, while for gases, it needs to be corrected through charts based on pressure difference and temperature. three Opening area A0: calculated as A0=π d ²/4, where d is the measured inner diameter of the orifice plate. four Differential pressure Δ p: directly measured by a pressure sensor or U-tube, in Pa. 5. Density ρ: The density of the liquid is less affected by temperature, and the gas needs to be converted according to the working pressure and temperature.
2. Decomposition of Calculation Steps 1 Determine the fluid nature of the Mingshi field: distinguish between liquids or gases, and select the corresponding ε value. two Parameter measurement and acquisition: - Measure the diameter d of the orifice plate opening and calculate A0. - Record the reading Δ p of the pressure differential exciter. -Check the table or conduct experiments to determine C and ε. 3. Substitute into the formula for calculation: evaluate step by step according to qv=C ε A0 √ (2 Δ p/ρ).
III. Example Calculation of Water Flow Measurement in a Pump Pipeline: • Known Conditions: d=0.05m, Δ p=5000Pa, ρ=998kg/m ³ (20 ℃ water), C=0.62，ε=1。 • Calculation process: 1 A0=π× (0.05) ²/4 ≈ 0.00196m ². two Substitute into the formula: qv=0.62 × 1 × 0.00196 × √ (2 × 5000/998
2. Calculation formula for air supply volume flow rate Orifice flowmeter
The core formula for calculating air supply volume flow rate with an orifice flowmeter is: $q_ {v}=C \ varepsilon A_ {0} \ sqrt {\ frac {2 \ Delta p} {\ rho} $, with the calculation result unit being cubic meters per second ($m ^ {3}/s $).
. one Formula parameter analysis(1) $q_ {v} $(volume flow rate) represents the volume of fluid per unit time and is the final calculation result.
(2) $C $(outflow coefficient) is related to the orifice plate structure, Reynolds number, and pressure measurement method, and the value needs to be determined through experimental calibration or by referring to standard charts.
(3) When the fluid is a gas, it needs to be calculated or corrected according to the pressure ratio ($\ Delta p/p $), isentropic index, etc. (liquid $\ varepsilon=1 $).
.(4) $A_ {0} $(opening area) is calculated by the opening diameter $d $of the orifice plate, with the formula $A_ {0}={\ pi d ^ {2}}/{4} $, in square meters.
(5) $\ Delta p $(pressure difference) is directly measured through a differential pressure ga
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