Discussion
Match each hopper term in List I with its meaning in List II.
List I
A. Bridging
B. Ratholing
C. Mass flow
D. Funnel flow
List II
1. A stable channel emptying through static material
2. A self-supporting arch across the outlet
3. Only a central core moves on withdrawal
4. All the material moves whenever any is withdrawn
Select the correct match.
Answer: C
Correct answer: A-2, B-1, C-4, D-3
Two flow patterns and two flow problems. Bridging is a self-supporting arch across the outlet; ratholing is a stable channel emptying through material that stays put. Mass flow moves everything whenever anything is withdrawn; funnel flow moves only a central core, which is the condition in which ratholes form.
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