Table 1 Knudsen number regimes.

From: Evaluation of permeability applicability based on continuum mechanics law in fluid flow through graphene membrane

Kn

Flow condition

Continuum mechanics

Kn < 10−3

Continuum flow

Applicable

10−3 < Kn < 10−1

Slip flow

Applicable

10−1 < Kn < 10

Transition regime

Not applicable

10 < Kn

Free-molecular flow

Not applicable

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