Principle of Orifice Flow Meter | Comparison of Pressure Loss between Orifice Flow Meter and Velbar Flow Meter

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1. Principle and formula of orifice plate differential pressure flowmeter

Principle and formula of orifice plate differential pressure flowmeter: The orifice plate differential pressure flowmeter consists of a throttling device, a pressure pipe, and a differential pressure gauge. Its working principle is based on the throttling principle of fluid flow, which means that when fluid flows in a pipeline with a throttling device, a static pressure difference will be generated at the pipe wall before and after the throttling device. Specifically, when a fluid flows in a pipeline, it has two forms of energy: static pressure energy and kinetic energy. In the absence of external energy, according to the law of conservation of energy, the sum of static pressure energy and kinetic energy possessed by a fluid, as well as the energy loss used to overcome fluid flow resistance, always remains constant. When the fluid flows through the throttling device, due to the obstruction effect of the throttling device, the fluid near the pipe wall is blocked, and some kinetic energy is converted into static pressure energy, resulting in a difference in fluid static pressure before and after the throttling device. Formula: The flow calculation formula of orifice plate differential pressure flowmeter is derived based on Bernoulli equation and flow coefficient. Bernoulli equation: For any two cross-sections in a pipeline, the Bernoulli equation is followed. The formula is: $frac {p {1} {rho}+frac {V_ {1} ^ {2}} {2}=frac {p {2}} {rho}+frac {V_ {2} ^ {2}} {2} $, where $p {1} $and $p {2} $are the fluid static pressures at sections I and II, $V_ {1} $and $V_ {2} $are the fluid flow velocities at sections I and II, respectively, and $rho $is

the fluid density. Flow formula: By deduction, the calculation formula for flow can be obtained. For incompressible fluids, the flow formula is: $q_ {v}=alpha A_ {0}sqrt {frac {2Delta p} {rho} $, where $q_ {v} $is the volumetric flow rate, $alpha $is the flow coefficient (which can be found in manuals or obtained through experiments due to various factors), $A_ {0} $is the area at the orifice, $Delta p $is the fluid static pressure difference before and after the throttling device, and $rho $is the fluid density. For compressible fluids, due to their tendency to undergo volume changes, the expansion coefficient ε needs to be introduced into the flow equation. Therefore, the formula for the amount of slag generated by flow modification is: $q_ {v}=alphavarepsilon A_ {0}sqrt {frac {2Delta p} {rho}} $Mass flow formula: The mass flow rate $q_ {m} $can be calculated by the volume flow rate $q_ {v} $and fluid density $rho $. The formula is: $q_ {m}=alpha A_ {0}sqrt {2rhoDelta p} $(for incompressible fluids) $q_ {m}=alphavarepsilon A_ {0}sqrt {2rhoDelta p} $(for compressible fluids) Summary: The orifice plate differential pressure flowmeter calculates flow rate by measuring the fluid static pressure difference before and after the throttling device. The principle is based on the law of conservation of energy and Bernoullis equation, and the calculation formula for flow rate can be derived through deduction. In practical applications, attention should be paid to the value of the flow coefficient and the installation conditions of the throttling device to ensure the accuracy and reliability of the measurement. Meanwhile, the orifice plate differential pressure flowmeter has the advantages of simple structure, stable and reliable

Principle of Orifice Flow Meter | Comparison of Pressure Loss between Orifice Flow Meter and Velbar Flow Meter

1. Principle and formula of orifice plate differential pressure flowmeter

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