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『Calculation formula for mass flowmeter』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. Principle of Mass Flow Meter
A mass flow meter is a device that directly measures mass flow and is designed based on the Coriolis principle. The formula for calculating mass flow rate is M=ρ ν A, where mass flow rate M is equal to the product of fluid density ρ, flow velocity ν, and flow area A. The principle of mass flowmeter mainly includes the following points:
1. Menghu heats the fluid flowing in the pipeline by using a heat source, and the thermal energy flows with the fluid. By measuring the changes in heat (temperature) caused by fluid flow, the mass flow rate of the fluid can be reflected. When the fluid composition is fixed, the specific heat at constant pressure is a known constant. Maintain a constant heating power and measure the temperature difference to calculate the mass flow rate; By using the constant temperature difference method, the temperature difference between two points is kept constant, and the mass flow rate can also be calculated by measuring the heating power. The constant temperature difference method is easy to operate and implement, so it is widely used in practical applications, especially for measuring large gas flow rates.
2、 To avoid contamination or corrosion of temperature measuring elements and heating devices due to contact with fluids, non-contact measurement methods can be used. Install the heater and temperature measuring element outside the thin-walled tube, and the fluid passes through the inside of the thin-walled tube to achieve non-contact measurement. This method is suitable for measuring small flow rates in small-diameter pipelines.
3、 For high flow branch balance measurement, it can be achieved through diversion method, that is, only meas
2. How to calculate mass flow rate?
Mass flow rate (kg/h) can be converted to flow rate (m/s), where flow rate=flow rate x inner diameter of pipeline x inner diameter of pipeline x π ÷ 4. But it is necessary to know the cross-sectional area S of the flow channel and the density ρ of the liquid. The flow rate is proportional to the pipe section and flow velocity, and the relationship between the three is: Q=SV, where Q - flow rate (m3/h); S - cross-sectional area (m2); Coarse V-average fluid velocity (m/s). Or split S into Q=(π D2)/4 * v * 3600 (m3/h), where Q represents flow rate (m3/h); D - Inner diameter of pipeline (m); V - average fluid velocity (m/s). The relationship between mass flow rate and volume flow rate is: Qm=ρ Q, where ρ - the density of the liquid (kg/m3, t/m3); Yan Danxing room temperature clean water - ρ=1000kg/m3. The relationship between mass flow rate and flow velocity can be obtained as Qm=ρ (π D2)/4 * v * 3600 (m3/h). Note: The volumetric flow rate is expressed in Q, with units such as m3/s, m3/h, l/s. Mass flow rate is expressed in Qm, with units such as t/h, kg/s. Additional information: According to the formula Q=(π D2)/4 * v * 3600 (m3/h), when the flow rate is constant, the flow rate is proportional to the square of the pipe diameter. When encountering pipe diameter substitution du