Question

Which of the following represents Peclet number?

(a) \(\frac{Lu}{D} \)

(b) \(\frac{u}{D} \)

(c) \(\frac{u}{DL} \)

(d) \(\frac{D}{uL} \)

I got this question in an interview for job.

Question is taken from Non Ideal Reactors topic in division Compartment Models, Models for Non Ideal Reactors of Chemical Reaction Engineering

Answer 1

Right choice is (a) \(\frac{Lu}{D} \)

Easiest explanation: Peclet number also defines the Dispersion model. It is the reciprocal of Dispersion number.