Discussion
Consider the following pairs of material property and the design decision it governs:
Bulk density - Conveyor capacity in tonnes per hour
Angle of repose - Chute slope and surcharge profile
Fragility - Choice between belt and screw
Abrasiveness - Saltation velocity in a pneumatic line
How many of the pairs given above are correctly matched?
Answer: B
Correct answer: Only three
Three pairs are right. Bulk density converts a volumetric rate into tonnes per hour; angle of repose governs chute slope and the surcharge profile on a belt; and fragility governs the choice between a gentle belt and an abrasive screw.
The fourth is wrong. Saltation velocity depends on particle size, shape and density - the aerodynamic properties that determine when a particle drops out of suspension. Abrasiveness governs pipe and bend wear, and materials of construction, but not the velocity required.
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