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 September 7, 2025 by Admin Drag on particles Drag on coloumn walls Bed height Bed voidage ✅ The correct answer is option C.
