5991. Umf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 Umf to 2.5 Umf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the

Drag on particles
Drag on coloumn walls
Bed height
Bed voidage
✅ The correct answer is option C.

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