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1. What are the types of mass flow meters?
2. How to calculate flow rate with differential pressure flow meter.
Differential pressure flow meter is a type of flow meter, and its calculation formula is related to the relationship between differential pressure and flow rate. The calculation formula for differential pressure flow meters may vary depending on different principles and applications. Here are some common formulas for calculating differential pressure flow meters. 1. Fluid static pressure balance flow meter: Q=CA (Δ P/ρ), where Q is the flow rate, C is the flow coefficient, A is the cross-sectional area of the measuring tube, Δ P is the static pressure difference between upstream and downstream, and ρ is the fluid density
2. Differential pressure is proportional to the square of the flow rate: Δ P ^ 2=K * Q ^ 2, where K is a constant and can be provided by the manufacturer or calibrated
3. Differential pressure is proportional to the square root of the flow rate: √ Δ P=K * √ Q, where K is a constant and can be provided by the shading manufacturer or calibrated
4. Standard orifice flowmeter: Q=(π D ^ 2/4) (2 Δ P/(ρ g)), where Q is the flow rate, D is the orifice diameter, Δ P/(ρ g) P is differential pressure, ρ is fluid density, g is gravitational acceleration
5. Standard Venturi flowmeter: Q=(π D ^ 2/4) (Δ P/(ρ gV)), where Q is flow rate, D is pipeline diameter, Δ P is differential pressure, ρ is fluid density, g is gravitational acceleration, and V is the blockage ratio of the Venturi tube. These formulas are only a part of the calculation formula for differential pressure flow meters. In practical applications, suitable and empty calculation formulas need to be select
3. Principle of Balanced Flow Meter
A balanced flow meter is a type of differential pressure flow meter, which has been improved in terms of product performance, technology or appearance. The same principle also has its own advantages and disadvantages, but its working principle is the same as other differential pressure flow meters, which are based on the energy conversion principle in sealed pipelines: in ideal fluid conditions, the flow rate in the pipeline is proportional to the square root of the differential pressure;
; The flow rate in the pipeline can be calculated based on the Bernoulli equation by measuring the differential pressure value. The balanced flow sensor is a porous disc throttling rectifier installed on the cross-section of the pipeline, with each holes size and distribution customized based on special formulas and test data, known as a function hole. When the fluid passes through the function hole of the disc, it will be balanced and rectified, the vortex will be minimized, and an approximate ideal fluid will be formed. By using a pressure measuring device, a stable differential pressure signal can be obtained. The volume flow rate and mass flow rate can be calculated according to the Bernoulli equation. With some special requirements in industrial automation processes, peoples requirements in production and life are also changing. Therefore, balance flow meters and throttling devices will also exist in the application site at the same time.