Question

The value of the Peclet number for CSTR is ____

(a) 1

(b) 0

(c) ∞

(d) 2

The question was posed to me in an internship interview.

I need to ask this question from Non Ideal Reactors topic in chapter Compartment Models, Models for Non Ideal Reactors of Chemical Reaction Engineering

Answer 1

The correct answer is (b) 0

To explain I would say: CSTR is characterised by complete mixing and recycling between the reactants and products. Hence, there is high diffusion of molecules within the reactor. As peclet number is inversely proportional to dispersion coefficient, PeCSTR = \(\frac{Lu}{∞}\) = 0.