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Inline Liquid Flow Measurement Using Coriolis Mass Flow Meters

04 Jan 2018

Coriolis flow meter is named after French mathematician and engineer Gaspard Gustave de Coriolis, who wrote a paper to describe the behaviour of objects in a rotating frame of reference. Increasingly, it is becoming the instrument of choice for flow measurements in the industry since 1980s. Instead of having a rotating frame of reference, Coriolis flow meter works on the principle that the inertia called Coriolis force is created by fluid flowing through an oscillating tube, resulting in twist in the tube that is proportional to the mass flow rate.

Coriolis flow meters come in a variety of designs [1-4]. A popular configuration consists of one or two U-shaped, horseshoe-shaped, or tennis racket-shaped (which are sometimes generalised as U-shaped) flow tube having liquid flow in at one end (D) and out at the other end (E) as shown in Figure 1. A magnetic coil oscillates the flow tube at point C at the natural frequency of the tube. Two sensors, S1 and S2, pick up the displacement of the inlet and outlet section of tube at two symmetrical points, A and B. The entire tube assembly is usually enclosed in a sensor housing which is connected to an electronics unit for data processing.

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