What is coriolis flowmeter
The coriolis flowmeter is primarily used to measure the mass flow rate of liquids, and in some cases gas flow measurements.The construction of coriolis flow meter is shown in Figure.
It consists of either a pair of parallel vibrating tubes or else a single vibrating tube that is formed into a configuration that has two parallel sections.
Principle of working
A coriolis flowmeter requires force acting on a tube carrying a flowing fluid. This force actually deforms tubes throughwhich the fluid flows.
The amount of deformation depends directly on the mass flow rate through the tubes.
Construction and working
Tubes are made of various materials of which stainless steel is the most common.
They are available in different shapes such as B-shape, D-shape, U-shape etc.
The tubes are anchored at two points. The electromechanical drive unit between the two anchors excites vibrations in each tube at the tube resonant frequency.
In the tube, the fluid moves away from and back towards the axis of oscillation, resulting in a changing angular momentum of the fluid.
The tube oscillation results into two opposite forces which twist the tube. First one way then the other with each oscillation cycle.
The output from pickup sensors are sine waves showing oscillation frequency. Measuring the magnitude of deformation, the mass flow rate can be measured.
