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In diffusion dominated regimes, the Peclet number is less than zero. Such is the case with microfluidic systems, where turbulence is low. In convection dominated systems, this number is greater than one.

== Derivation [3]==

For a one dimensional system as described in '''Figure 1''', with a specie concentration, <math>C</math> following relations can be made to relate flux in, <math>J_{in}</math> , flux out,<math>J_{out}</math> and control volume <math>V</math>. From this system, the Péclet number can be derived.