Granular Flow - Application
Commodity sampling by cutters from a falling stream
Bulk commodities are frequently sampled by passing a pair
of parallel cutter blades through a stream of material falling from a
conveyor belt.
It is essential that the sample accurately reflects the original material.
The conveyor speed is 3 m/s and the particle top size is D=20 mm. The
cutter has 10 mm thick blades, symmetric 60 deg angle tips and an aperture
of 3D and passes through the ore stream at 0.6 m/s and at an angle of 30
deg.
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An ensemble of 83 sets of particles were used to calculate
statistics.
This sample cutter has an average extraction ratio of only 71%
and an estimated bias of 1.6%. |
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Such modelling can be used to improve sampling
methodologies.
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animation (7.9MB)
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