Influence of particle breakage on the wall friction coefficient of brittle particulate solids Part 2. Application to a silo design
Review articleOpen access

AbstractThis paper concerns the influence of wall friction on a hopper design, referring to measurements of effective wall friction reported in Part 1 of this paper. The important observation was that the wall friction increases rapidly, within a few meters of displacement, due to particle breakage and migration. Using first the original value of the wall friction, a conventional hopper was designed for this material, assuming the wall friction to be constant. A numerical procedure was then developed in which the wall friction may vary with its displacement from the top of the hopper. The experimental results were again applied. This leads to a change in the stress distribution at the wall and hence to a change in the required hopper design. The crucial influence of wall friction as a parameter in hopper design is demonstrated. It also demonstrates that, by using numerical techniques and experimental measurements, realistic design can now be attained.

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