Question

When does the initiation of entrainment start in the fluidized bed?

(a) Before the pressure drop goes to zero

(b) Point when pressure drop becomes constant

(c) Start of the fluidization process

(d) None of the mentioned

I had been asked this question in an internship interview.

The above asked question is from Pressure Drop in Fluidized Beds in division Fluidization and Mapping of Regimes of Fluidization Engineering

Answer 1

Right option is (a) Before the pressure drop goes to zero

The best I can explain: When the velocity goes high the particles start lifting up, it is the point when the entrainment has started.