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1. Which flow meters require full tube operation?
Turbine flow meters and rotor flow meters require full tube operation.
1、 Turbine flowmeter: Turbine flowmeter is a flow measurement instrument based on the principle of flow calculation and turbine rotation. The turbine flowmeter needs to operate at full capacity, which means it can ensure the accuracy of turbine rotation and flow measurement.
2、 Rotary flowmeter: Rotary flowmeter is a type of flowmeter that calculates the flow rate through the angular velocity of the rotor rotation. Because the fluid generates rotational inertia when flowing through the rotor, if a portion of the fluid flows through the rotor, the rotor that continues to rotate will shake off the fluid, resulting in a decrease in flow rate. Therefore, it is necessary to transport the entire pipe in the rough flow chamber. In addition to turbine flow meters and rotary flow meters, some working principles such as mass flow meters and thermal measuring instruments also require full tube operation to ensure stable measurement and high accuracy.
2. 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 Reynol
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 correction formula: \ [\ frac {Q_ {1}} {Q_ {0}}=\ sqrt {\ frac {\ rho_ {0} (\ rho_ {\ mathrm {f} - \ rho_ {1})} {\ rho_ {1} (\ rho_ {\ mathrm {f} - \ rho_ {0})} \] • \ (\ rho_ {0}, \ rho_ {1} \): Liquid density under calibration and actual operating conditions; • \ (\ rho_ {\ mathrm {f}} \): Float material density (fixed value).
3. Types and principles of flow meters
Types and principles of flow meters Flow meters are one of the important instruments in industrial measurement, used to measure the volume or mass of fluid (liquid or gas) flowing through per unit time.
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