Orifice flowmeter calculation software | Software for calculating medium flow rate

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1. Flow formula of orifice flowmeter

The core flow formulas of orifice flowmeter are volume flow formula and mass flow formula, which are classic fluid measurement formulas based on differential pressure method The basic differential pressure flow formula (universal derivation form) is derived based on Bernoulli equation and continuity equation, and is the universal basic formula for all differential pressure flow meters:$$ Q = C_d \times \varepsilon \times A_0 \times \sqrt{\frac{2\Delta P}{\rho}}$$ The meaning of each parameter in the revised manuscript is as follows: - $C_d $: flow coefficient, determined by the structure of the orifice plate, fluid flow state, and Reynolds number. The flow coefficient of a standard orifice plate can be obtained from industry standards. - $\ varepsilon $: expansion correction coefficient, used to compensate for the volumetric expansion effect of compressible fluids (gases, steam). For incompressible fluids, the value is 1- $A_0 $: the cross-sectional area of the orifice plate opening, $A_0=\ frac {pi d ^ 2} {4} $, $d $is the diameter of the orifice plate opening, - $\ Delta P $: the static pressure difference before and after the orifice plate, taking the pressure at the upstream and downstream pressure taps of the orifice plate. Difference - $\ rho $: The density of the fluid in working condition is 2 Common formulas in segmented scenarios • Volume flow formula for incompressible fluids (liquids) At this time $\ varepsilon=1 $, the formula is simplified as: $$Q-v=C_d \ times \ frac {\ pi d ^ 2} {4} \ times \ sqrt {\ frac {2 \ Delta P} {\ rho} $The unit is usually $m ^ 3/h $or $L/min $• Volume flow formula for compressible fluids (gases/vapors) requires the introduction

Calculation software for orifice flowmeter

of an expansion correction coefficient. In practical engineering, the simplified calculation form recommended by the ISA standard is often used:$$ Q_v = C_d \times \frac{\pi d^2}{4} \times \varepsilon \times \sqrt{\frac{2\Delta P}{\rho_1}}$$ Among them, $\ rho_1 $is the working density upstream of the fluid. The mass flow rate formula can be obtained by multiplying the volume flow rate by the fluid density$$ Q_m = \rho \times Q_v = C_d \times \varepsilon \times A_0 \times \sqrt{2\rho\Delta P}$$3. The industry standardized formula for standard orifice plates is based on GB/T 2624.1-2018 "Measurement of full pipe fluid flow using differential pressure devices installed in circular cross-section pipelines - Part 1: General principles and requirements". The flow coefficient of standard orifice plates can be directly obtained by looking up the Reynolds number in a table, and can also be calculated using an approximate formula in engineering:$$ C_d = 0.5961 + 0.0261\beta^4 - 0.216\beta^8 + 0.000521\left(\frac{10^4\beta}{Re_D}\right)^{0.7}$$ Where $\ beta=\ frac {d} {D} $, $D $is the inner diameter of the pipeline, and $Re-D $is the Reynolds number of the fluid inside the pipeline.

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 pla

Orifice flowmeter calculation software | Software for calculating medium flow rate

1. Flow formula of orifice flowmeter

2. Calculation formula for air supply volume flow rate Orifice flowmeter

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