Discussion
For a packed bed, dispersion is usually correlated against
Answer: A
Correct answer: a Peclet number on particle diameter
In a packed bed the mixing length is set by the particles rather than by the vessel, so the dispersion correlations are written in terms of a Peclet number based on particle diameter - and that group settles at a value of about two for liquids in turbulent flow over a wide range of conditions. The vessel Peclet number is then obtained from it and the bed geometry, as the next item shows.
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