Which of the following does not provide plug flow of Solid – fluids?

(a) Fluidised bed reactor

(b) Countercurrent flow in blast furnaces

(c) Crossflow in moving belt

(d) Concurrent flow in driers

This question was posed to me during a job interview.

I’m obligated to ask this question of Design of Fluid Particle Reactors in section Fluid-Particle Reactions: Kinetics of Chemical Reaction Engineering

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