Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Fluid flow in wood fiber network
2006 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Cellulose material is processed to pulp suspensions and MDF boards in order to produce products such as papers, magazines, laminate floors or door skins. A critical stage of these processes is when the cellulose fiber networks are compressed to specific densities and when most of the fluid originally positioned between and inside the fibers is forced to leave the network. The fiber network is then exposed to a drag force generated by the flow. The magnitude of this force is dependent upon how easy the fluid can flow through the network, which is commonly described by its permeability. In addition to the permeability, which relates to the drag on each fiber, there is a solid network force. The response to this force from the fiber network is often termed as the compressibility of it. Hence, to be able to model and predict the compression stage in cellulose material related processes these two material properties must be known. In this thesis two equipments to measure the permeability of MDF networks and pulp suspensions are evaluated and a neat model for a part of the MDF- compression stage is developed. A reference material consisting of spherical particles and relevant fiber networks are used as test objects for the equipments enabling a comparison to theoretical models and existing experimental results. The outcome is that correct enough permeability data are obtained with respective equipment as long as Reynolds number is sufficiently low. The equipments are then used to study different materials showing, for instance, that highly compressed MDF-networks are strongly anisotropic as to permeability and that the tested hardwood pulps have an overall higher permeability compared to the softwood pulps investigated. It was also found that the permeability of the pulps was not influenced by different mechanical treatments of the fiber network, as long as the geometrical dimensions of the fibers were constants.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2006. , 7 p.
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 2006:34
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-26639Local ID: f52248b0-9fea-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-26639DiVA: diva2:999806
Note
Godkänd; 2006; 20070109 (haneit)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-24Bibliographically approved

Open Access in DiVA

fulltext(1542 kB)86 downloads
File information
File name FULLTEXT01.pdfFile size 1542 kBChecksum SHA-512
e2419afc11ce9be42be039337f1db8d3e37b311619bff0f6ec9de2b118b992f20e67d35f7ed39886143e9b8842e49c53973aec1a86a0e14f2b25465152d970b3
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Pettersson, Patrik
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
Total: 86 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 24 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf