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A new fiber-optic probe system was developed for the direct measurement of the local velocity of particles in gas-solids flow suspension. It consists of a five-fiber optical probe and a microcomputer data processor. This instrument is capable of measuring particle velocities in the range of 0.3 to 24 m/s and mean particle sizes in the range of 50 μm to 5 mm for solids hold-up between 0.1% and 25%...
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