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Effects of serial and parallel pore nonuniformities: Results from two models of the porous structure

Nilsson, Lars and Stenström, Stig LU (1996) In Transport in Porous Media 25(3). p.335-350
Abstract
The effects of parallel-type and serial-type pore nonuniformities on the effective diffusivity and the permeability of a porous material were evaluated, constant porosity and constant specific surface area being assumed. Two structural models were considered. In the first model, the porous structure was described as a bundle of cylindrical capillaries penetrating the whole thickness of the material and in the other it was described instead as a collection of randomly distributed obstacles hindering transport. Both models predicted that parallel-type pore nonuniformities produce an increase in permeability compared with uniform structures having the same porosity and specific surface area. Both models also predicted that the increase in... (More)
The effects of parallel-type and serial-type pore nonuniformities on the effective diffusivity and the permeability of a porous material were evaluated, constant porosity and constant specific surface area being assumed. Two structural models were considered. In the first model, the porous structure was described as a bundle of cylindrical capillaries penetrating the whole thickness of the material and in the other it was described instead as a collection of randomly distributed obstacles hindering transport. Both models predicted that parallel-type pore nonuniformities produce an increase in permeability compared with uniform structures having the same porosity and specific surface area. Both models also predicted that the increase in permeability due to parallel-type pore nonuniformities would be larger than the increase in effective diffusivity. Regarding serial-type pore nonuniformities, both models predicted a decrease in permeability and that this decrease would be greater than the decrease in effective diffusivity. The predicted changes in effective diffusivity due to nonuniformities of the sample differed for the two structural models. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
surface area, specific, pore-size distribution, permeability, effective diffusivity, computational fluid dynamics, Cauchy-Schwarz-Bunjakovskij inequality
in
Transport in Porous Media
volume
25
issue
3
pages
335 - 350
publisher
Kluwer
external identifiers
  • wos:A1996WB13800005
  • scopus:0030386210
ISSN
0169-3913
DOI
10.1007/BF00140987
language
English
LU publication?
yes
id
8978af19-39dc-4c24-8b87-10dade630afa (old id 3914042)
date added to LUP
2013-07-01 12:15:02
date last changed
2017-01-01 07:23:01
@article{8978af19-39dc-4c24-8b87-10dade630afa,
  abstract     = {The effects of parallel-type and serial-type pore nonuniformities on the effective diffusivity and the permeability of a porous material were evaluated, constant porosity and constant specific surface area being assumed. Two structural models were considered. In the first model, the porous structure was described as a bundle of cylindrical capillaries penetrating the whole thickness of the material and in the other it was described instead as a collection of randomly distributed obstacles hindering transport. Both models predicted that parallel-type pore nonuniformities produce an increase in permeability compared with uniform structures having the same porosity and specific surface area. Both models also predicted that the increase in permeability due to parallel-type pore nonuniformities would be larger than the increase in effective diffusivity. Regarding serial-type pore nonuniformities, both models predicted a decrease in permeability and that this decrease would be greater than the decrease in effective diffusivity. The predicted changes in effective diffusivity due to nonuniformities of the sample differed for the two structural models.},
  author       = {Nilsson, Lars and Stenström, Stig},
  issn         = {0169-3913},
  keyword      = {surface area,specific,pore-size distribution,permeability,effective diffusivity,computational fluid dynamics,Cauchy-Schwarz-Bunjakovskij inequality},
  language     = {eng},
  number       = {3},
  pages        = {335--350},
  publisher    = {Kluwer},
  series       = {Transport in Porous Media},
  title        = {Effects of serial and parallel pore nonuniformities: Results from two models of the porous structure},
  url          = {http://dx.doi.org/10.1007/BF00140987},
  volume       = {25},
  year         = {1996},
}