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Constrictivity
Constrictivity is a dimensionless parameter used to describe transport processes (often molecular diffusion) in porous media.
Constrictivity is viewed to depend on the ratio of the diameter of the diffusing particle to the pore diameter. The value of constrictivity is always less than 1. The constrictivity is defined not for a single pore, but as the parameter of the entire pore space considered.
The resistance to transport in porous media increases because the viscosity of the fluid (which fills the pores) increases in the vicinity of the pore walls (Renkin effect;〔Renkin, EM (1954): ''Filtration, diffusion and molecular sieving through porous cellulose membranes.''J. Gen. Physiologist., 38: 225-243〕 see also electroviscous effects). This effect is important in very narrow pores and in pore narrowing their diameter to the same size as the diameter of the diffusing particles. Constrictivity must be distinguished from the effects of Knudsen diffusion. Knudsen diffusion occurs when the particle interacts with the pore walls more than it does with other particles due to the large free path and narrow pores. Constrictivity, on the other hand, depends on the influence of the pore walls on the fluid filling the pores.
There are a number of empirical formulas used to estimate the value of constrictivity.〔Renkin, EM (1954): ''Filtration, diffusion and molecular sieving through porous cellulose membranes.''J. Gen. Physiologist., 38: 225-243〕〔Beck, RE, Schultz, JS (1970): ''Hindered Diffusion in Microporous Membranes with known pore geometry.''Science, 170: 1302-1305〕〔Satterfield, CN, Colton, CK (1973): ''Restricted diffusion in liquids within fine pores.''AIChE J., 19: 628〕〔Chantong, A., Massoth, FE (1983): ''Restrictive diffusion in aluminas.''AIChE J., 29 (5): 725-731〕 For simple pore geometries, constrictivity can be inferred from the geometry of the porous media.〔Petersen, EE (1958): ''Diffusion in a pore of varying cross section.''AIChE J., 4 (3): 343-345〕〔Curie, JA (1960): ''Gaseous diffusion in porous media, Parts 1 and 2''Br J. Appl. Phys., 11: 314-324〕〔Michaels, AS (1959): ''Diffusion in a pore of irregular cross section.''AIChE J., 5: 270-271〕 In practice, the constrictivity together with the porosity and tortuosity are often used in models as purely empirical parameters to establish the effective diffusivities in porous media.
==Footnotes==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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