U mf is the minimum fluidisation velocity for a bed of particles. An i – McqOptions

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1.	U mf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 U mf to 2.5 U mf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the
A.	drag on particles
B.	drag on coloumn walls
C.	bed height
D.	bed voidage
Answer» D. bed voidage

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