Parameters that describe the overall behaviour of the fluidized bed in the bubbling regime are: (i) minimum fluidization velocity, (ii) Pressure drop across the bed, (iii) Bed height increase, (iv) Particle elutriation.
Correct Answer: (i) (ii) (iii) (iv)
All the statements mentioned are correct. Examining each statement, when we have the bubbling regime for Gas-solid fluidised bed, the parameters that govern the bubbling is necessarily its pressure drop, that determines the flow velocity as well as the bed height increase, and vice versa, all the four points are interconnected.