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The Coriolis Effect
The Coriolis effect is an inertial force described by the 19th-century French engineer-mathematician Gustave-Gaspard Coriolis in 1835. Coriolis showed that, if the ordinary Newtonian laws of motion of bodies are to be used in a rotating frame of reference, an inertial force - acting to the right of the direction of body motion for counterclockwise rotation of the reference frame or to the left for clockwise rotation - must be included in the equations of motion.
The effect of the Coriolis force is an apparent deflection of the path of an object that moves within a rotating coordinate system. The object does not actually deviate from its path, but it appears to do so because of the motion of the coordinate system.
How the Coriolis Force works inside a Flow Meter
The Coriolis meter has a sine wave voltage applied to an electromagnetic drive which produces an oscillating motion of the tube. The amplitudes are related to the mass flow and the frequency is related to the product density. The reason that the output amplitude changes with flow may be explained by the Coriolis effect. The vibration of the tube gives a slight angular rotation about its center. As the fluid moves away from the center, there is a resultant Coriolis force which opposes the rotational motion. The flow movement toward the center produces a Coriolis force which aids the tube rotation. The resultant force produces the measured sine wave which is measured and converted to the mass flow reading. |
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