Coriolis flow meter

With regard to multiphase flow measurement, two of the most commonly used flow meter devices in industry are the Coriolis flow meter and electromagnetic flow meter. The Coriolis flow meter is widely used owing to its high accuracy (Tavoularis, 2005) but it assumes... 

There are many other types of flow meters that can be used such as venturi meters, vortex shedder flow meters, and Coriolis flow meters. Any of these may be preferred depending on the application. Fluid flow can also be measured indirectly using chemical analysis and mass and energy balance calculations. Air flow measurements are commonly made this way since an oxygen analyzer is generally more accurate than a thermal mass flow meter. 

An example of a mass flow measming device is the Coriolis flow meter. 

Coriolis flow meter Hot-wire anemometer Thermal mass flow meter Piezo-electric element Magnetic transducer... 

Figure from brochure Inside of Coriolis flow meter Rheonik, Schwing Verfahrenstechnik, Neuldrchen-Vluyn, Germany. 

Coriolis-Type Flow Meters. In CorioHs-type flow meters the fluid passes through a flow tube being electromechanically vibrated at its natural frequency. The fluid is first accelerated as it moves toward the point of peak vibration ampHtude and is then decelerated as it moves from the point of peak ampHtude. This creates a force on the inlet side of the tube in resistance to the acceleration and an opposite force on the outlet side resisting the deceleration. The result of these forces is an angular deflection or twisting of the flow tube that is directly proportional to the mass flow rate through the tube. 

PlaCHE. K. O. Meclt. Eng. (March, 1979), 36. Coriolis/gyroscope flow meter. 

In this chapter we will illustrate and analyze some of the more common methods for measuring flow rate in conduits, including the pitot tube, venturi, nozzle, and orifice meters. This is by no means intended to be a comprehensive or exhaustive treatment, however, as there are a great many other devices in use for measuring flow rate, such as turbine, vane, Coriolis, ultrasonic, and magnetic flow meters, just to name a few. The examples considered here demonstrate the application of the fundamental conservation principles to the analysis of several of the most common devices. We also consider control valves in this chapter, because they are frequently employed in conjunction with the measurement of flow rate to provide a means of controlling flow. 

Velocity meters measure the velocity v of fluid flow in a pipe of known cross section, thus yielding a signal linearly proportional to the volume flow rate Q. Mass meters provide signals directly proportional to the mass flow rate m = pQ, where p is the mass density. Coriolis meters, which are true mass meters, can be used only for liquids. Thermal-type flow meters use a heating element and determine the rate of heat transfer, which is proportional to the mass flow rate. This type of device is used mostly for gas measurements, but liquid flow designs are also available. 

In the above method, an autotitrator repeatable to +0.5% relative error (or 0.01 wt%) was employed to measure H2O2 wt%, independent of the relative amounts of DI water and slurry. A densitometer with an accuracy of + 0.0005 g/cc was used to estimate the percentage volume of slurry in the mixture (repeatability = +3% slurry by volume), for a specific concentration of H2O2. In the above blend, the measured H2O2 wt% concentration was used to control the speed (or strokes/batch) of the W2000 slurry pump, whereas the density, obtained using a coriolis mass flow meter, controlled the speed of the DI water pump. On the basis of the property curves obtained from bench... 

Flow. Prefer coriolis, vortex, or magnetic flow meters over orifice or venturi. Keep fluid velocity >0.3 m/s. 

Flows are of fundamental importance for controlling a plant and for balancing and metering liquids. A large number of measurement principles are available here. Apart from the Coriolis-force meter, which directly measures the mass flux, all of them measure the volume flow. 

The types of instruments used in an industrial setting are often different from those used in the laboratory. The most common high precision laboratory instrument is the mass flow controller and rotameters are frequent for applications for both gases and liquids but are much less accurate. In industry, obstruction flow meters, Coriolis meters, and vortex shedders are more standard. 

Flow prefer coriolis, vortex or magnetic flow meters over orifice or venturi. Keep fluid velocity > 0.3 m s" Expected error orifice meter, +1-5% of full scale coriolis, +0.2% of full scale magnetic, +0.5-1% of full scale venturi, +0.25-3% of full scale. 

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