Abstract
Gas diffusion through nonporous membranes is a concentration gradient driven process, which is generally well described by Fick’s first law (Crank 1975)
where D is the diffusion coefficient and c refers to the local gas or penetrant concentration. For unidirectional diffusion through a flat membrane, Eq. (3-1) can be written for species i as (Crank 1975)
where D i (c i ) indicates that the diffusion coefficient can be dependent on the local composition of penetrant i.
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Zolandz, R.R., Fleming, G.K. (1992). Theory. In: Ho, W.S.W., Sirkar, K.K. (eds) Membrane Handbook. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3548-5_3
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