Discussion
A packed bed is 2 metres long with 5 millimetre particles and a particle Peclet number of 2. What is the vessel Peclet number?
Answer: B
Correct answer: 800
The two Peclet numbers differ by the ratio of the lengths involved: \[ Pe_{vessel} = Pe_{particle} \times \frac{L}{d_p} = 2 \times \frac{2}{0.005} = 2 \times 400 = 800. \] A vessel Peclet number of 800 means dispersion is very small compared with convection, so this bed is close to plug flow - which is the usual finding for a long bed of small particles.
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