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How the gas behave across the fluidized bed, when the velocity is more than minimum fluidization?

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in Fluidization Engineering by (102k points)
How the gas behave across the fluidized bed, when the velocity is more than minimum fluidization?

(a) Bubbles formation

(b) Slugs formation

(c) Smooth flow

(d) None of the mentioned

This question was posed to me in unit test.

I would like to ask this question from Pressure Drop in Fluidized Beds topic in portion Fluidization and Mapping of Regimes of Fluidization Engineering

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Correct choice is (a) Bubbles formation

For explanation I would say: Since we have voids formed, the gas try to form bubbles while passing through the bed.

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