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1. Calculation formula for flow rate of metal rotor flowmeter
The core flow calculation formula and correction method of metal rotor flowmeter are as follows:
1. Basic flow formula The basic formula of metal rotor flowmeter is based on the force balance of the float, and the volume flow rate when ignoring viscous force is: \ [Q=C {\ mathrm {R}} A_ {\ mathrm {R}} \ sqrt {\ frac {2V_ {\ mathrm {f}}} (\ rho_ {\ mathrm {f}} - \ rho) g} {\ rho A_ {\ mathrm {f}}}} \] The meanings of each variable: • \ (Q \): Volume flow rate (Unit: \ (m ^ {3}/s \); • \ (C {\ mathrm {R}} \): Flow coefficient (determined experimentally by float shape and Reynolds number, etc.); • \ (A_ {\ mathrm {R}} \): The annular gap area between the float and the cone tube (unit: \ (m ^ {2} \)); • \ (V_ {\ mathrm {f}} \): Float volume (unit: \ (m ^ {3} \)); • \ (\ rho_ {\ mathrm {f}} \): Float material density (unit: \ (kg/m ^ {3} \)); • \ (\ rho \): Fluid density (unit: \ (kg/m ^ {3} \)); • (g): Gravity acceleration (usually taken as 9.81m/s ^ {2} \); • \ (A_ {\ mathrm {f}} \): The maximum deficit cross-sectional area of the float (unit: \ (m ^ {2} \)).
2. The flow correction formula for practical applications needs to be corrected for differences between actual operating conditions and calibration states: 1 Gas flow correction formula: \ [\ frac {Q_ {1}} {Q_ {0}}=\ sqrt {\ frac {p_ {0}T_ {1}\rho_{0}}{p_ {1}T_ {0} \ rho_ {1}} \] • \ (p0 {0}, p0 {1} \): Absolute pressure of calibration and actual operating conditions; • (T_ {0}, T_ {1} \): thermodynamic temperature (in K) for calibration and actual operating conditions; • \ (\ rho_ {0}, \ rho_ {1} \): Gas density for calibration and actual operating conditions. two Liquid flow correct
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2. Why is the rotor flowmeter called a constant pressure drop flowmeter
This is the principle difference between rotor and differential pressure flowmeters.
. 1. The internal structure of the rotor flowmeter sensor is uniform, and the structure of the float is also designed with low pressure loss (relatively stable pressure). 2. The internal structure of the differential pressure flowmeter sensor is also uniform, but there is a cone. (The differential pressure type is based on the energy conversion principle in the sealed pipeline, which means that for stable fluids, the pipeline pressure is inversely proportional to the square of the medium flow velocity in the pipeline: as the speed of collapse increases, the pressure will decrease.) The working principle of the float shielded flowmeter (also known as the rotor flowmeter) is different from that of the differential pressure flowmeter. Differential pressure flowmeter reflects the magnitude of flow sensation through changes in differential pressure under the condition of constant throttling area (such as orifice plate flow area). However, the float flowmeter measures the flow rate by keeping the pressure drop constant and using the change in throttling area, that is, the float flowmeter adopts the flow measurement method of constant pressure drop and variable throttling area. If you have any questions about the intelligent system of She
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