Discussion
The condition in which all the material in a bin moves whenever any is withdrawn is _____ flow.
Answer: B
Correct answer: mass
In mass flow every particle is in motion whenever anything is withdrawn, so there are no stagnant regions and the bin discharges first-in first-out. It requires steep smooth walls and an adequate outlet. The alternative, funnel flow, moves only a central core and leaves the rest in place - the condition in which ratholing occurs.
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