Pressure and mean free path

Table 1. Values of the product K of pressure and mean free path of common gases and vapors...

Knudsen diffusion [20,30,32,37 ] depending on gas pressure and mean free path in the gas phase applies to pores between 10 A and 500 A in size however, there are examples in the literature where it was observed for much larger pores [41 ]. In this region, the mean free path of molecules in gas phase A is much larger than the pore diameter d. It is common to use the so-called Knudsen number K = X d o characterize the regime of permeation through pores. When 1, viscous (PoiseuiUe) flow is realized. The condition for Knudsen diffusion is 1. An intermediate regime is realized when A), 1. 

Knudsen diffusion [95, 97-99] depending on pressure and mean free path which applies to pores between 10 A and 500 A in size [100]. In this region, the mean fiee path of molecules is much larger than the pore diameter. It is common to use Knudsen number K = 14/to characterize the... 

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See also in sourсe #XX -- [ ]

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