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The Péclet number (Pe) is a dimensionless number that represents the ratio of the convection rate over the diffusion rate in the a convection-diffusion transport system. <sup>[1][2]</sup>

<math>Pe = \frac{(Convection \, rate)}{(Diffusion \, rate)} = \frac {UL}{D}</math>U represents linear flow in a control volume, L represents the length scale of the flow and D is the diffusion constant.

This number can also be represented as a ratio of diffusive to convective time scales.