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) nochange in the
(A) Drag on particles
(B) Drag on column walls
(C) Bed height
(D) Bed voidage
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) nochange in the
(A) Drag on particles
(B) Drag on column walls
(C) Bed height
(D) Bed voidage