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1. Calculation formula for nitrogen flowmeter
When the fluid flows through the turbine flow sensor, the turbine rotates under the force of fluid thrust, and its speed is proportional to the average flow velocity of the pipeline. The rotation of the turbine periodically changes the magnetic resistance value of the magneto electric converter, and the magnetic flux in the detection coil changes periodically, generating periodic electric pulse signals. Within a certain range of flow (Reynolds number), the electric pulse signal is proportional to the volumetric flux of the fluid passing through the turbine flow sensor. The theoretical flow equation of a turbine flowmeter is: where n is the turbine speed; Qv is the volumetric flow rate; A is a parameter related to fluid properties (density, viscosity, etc.) and turbine structural parameters (turbine inclination angle, turbine diameter, channel cross-sectional area, etc.) from early times; B is a coefficient related to the turbine clearance and fluid velocity distribution; C is a coefficient related to the frictional torque.
2. How much does a liquid flowmeter cost?
3. How to convert a nitrogen flow meter ml/min to one MPa
There is no such conversion. The unit of flow rate is ML/min, MPa is pressure, and the unit is N/square meter. How to convert this?. I guess you mean to control pressure through flow, right? It can be calculated according to the Bernoulli equation, where p, ρ, and v are the pressure, density, and linear velocity of the fluid, respectively; H is the vertical height; G is the acceleration due to gravity; C is a constant. Sakura Province, you can use the flow rate chart you currently know (in the experiment, it is a linear
4. Working principle of nitrogen flowmeter
Introduction to the working principle of nitrogen flowmeter: Setting a triangular cylindrical vortex generator in the fluid alternately generates regular vortices from both sides of the vortex generator, which is called Karman vortex. As shown in the figure on the right, the vortex columns are asymmetrically arranged downstream of the vortex generator Assuming the frequency of vortex occurrence is f, the average flow velocity of the measured medium is d, the width of the upstream face of the vortex generator is d, and the diameter of the body is D, the following relationship can be obtained: f=SrU1/d=SrU/md
(1), where U1 represents the average flow velocity on both sides of the vortex generator, m/s； Sr Strouhal number; The ratio of the bow shaped area on both sides of the m - vortex generator to the cross-sectional area of the pipeline is qv, which is qv=π D2U/4=π D2mdf/4Sr (2) K=f/qv=[π D2md/4Sr] -1 (3). In equation K - the instrument coefficient of the flowmeter is the number of pulses/m3 (P/m3). K is not only related to the geometric dimensions of the vortex generator and pipeline, but also to the Strouhal number. The Strouhal number is a dimensionless parameter that is related to the shape of the vortex generator and the Reynolds number. Figure 2 shows the relationship between the Strouhal number of a cylindrical vortex generator and the Reynolds number of a pipeline. As shown in the figure, Sr can be regarded as a constant within the range of ReD=2 × 104 to 7 × 106, which is the normal operating range of the instrument.