Advanced

Modeling and correlating the permeability of pulp and paper

Nilsson, L and Stenström, Stig LU (1997) In Drying Technology 15(6-8). p.1845-1855
Abstract
A sheet of paper is modelled as a network of cellulose fibres, either cylindrical or band-shaped. The equations for creeping flow through such structures are solved, and the calculated permeabilities are compared with measured values. Flow through some paper structures such as pulp sheets and handsheets of unbeaten sulphate pulp is adequately described by the structural model involving band-shaped fibres when a fibre aspect ratio of 3.5 is used. For newsprint sheets the measured permeability is lower than that predicted by the models when physically realistic values of the aspect ratio are taken. A total of 19 different paper grades have been characterised by measurement of the total specific surface area and the fibre orientation ratio in... (More)
A sheet of paper is modelled as a network of cellulose fibres, either cylindrical or band-shaped. The equations for creeping flow through such structures are solved, and the calculated permeabilities are compared with measured values. Flow through some paper structures such as pulp sheets and handsheets of unbeaten sulphate pulp is adequately described by the structural model involving band-shaped fibres when a fibre aspect ratio of 3.5 is used. For newsprint sheets the measured permeability is lower than that predicted by the models when physically realistic values of the aspect ratio are taken. A total of 19 different paper grades have been characterised by measurement of the total specific surface area and the fibre orientation ratio in addition to the measurements of effective diffusivity, permeability and porosity. Permeability and effective diffusivity correlate with each other and permeability correlates with fibre orientation, so that at constant porosity, permeability decreases with increasing fibre orientation. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
porous structure, permeability, computational fluid dynamics, effective diffusivity, cellulose fibre
in
Drying Technology
volume
15
issue
6-8
pages
1845 - 1855
publisher
TAPPI
external identifiers
  • wos:A1997XR31800017
  • scopus:0031176244
ISSN
1532-2300
DOI
10.1080/07373939708917331
language
English
LU publication?
yes
id
b29ffe2e-0bb4-409c-980e-45dae9bd1126 (old id 3914038)
date added to LUP
2013-07-01 12:12:26
date last changed
2017-01-01 04:44:13
@article{b29ffe2e-0bb4-409c-980e-45dae9bd1126,
  abstract     = {A sheet of paper is modelled as a network of cellulose fibres, either cylindrical or band-shaped. The equations for creeping flow through such structures are solved, and the calculated permeabilities are compared with measured values. Flow through some paper structures such as pulp sheets and handsheets of unbeaten sulphate pulp is adequately described by the structural model involving band-shaped fibres when a fibre aspect ratio of 3.5 is used. For newsprint sheets the measured permeability is lower than that predicted by the models when physically realistic values of the aspect ratio are taken. A total of 19 different paper grades have been characterised by measurement of the total specific surface area and the fibre orientation ratio in addition to the measurements of effective diffusivity, permeability and porosity. Permeability and effective diffusivity correlate with each other and permeability correlates with fibre orientation, so that at constant porosity, permeability decreases with increasing fibre orientation.},
  author       = {Nilsson, L and Stenström, Stig},
  issn         = {1532-2300},
  keyword      = {porous structure,permeability,computational fluid dynamics,effective diffusivity,cellulose fibre},
  language     = {eng},
  number       = {6-8},
  pages        = {1845--1855},
  publisher    = {TAPPI},
  series       = {Drying Technology},
  title        = {Modeling and correlating the permeability of pulp and paper},
  url          = {http://dx.doi.org/10.1080/07373939708917331},
  volume       = {15},
  year         = {1997},
}