Analysis of fluid flow through porous media based on x-ray micro-tomographic reconstructions
This thesis deals with creeping fluid flow through fibrous porous materials. Permeability
through a porous medium is a measure of the ability of the material to transmit
fluids. For testing and demonstration purposes the permeability values of a few
fibrous heterogeneous materials, namely synthetic non-woven felt, wet pressing felt,
cardboard, newsprint and hardwood paper, were measured experimentally. Reconstructions
of the same materials under similar compression states were captured
by x-ray micro-tomography. The actual microscopic pore structure thus obtained
was utilised in the numerical lattice-Boltzmann analysis for solving the fluid flow
permeability of the materials. Agreement between the experimental and numerical
results was good. In addition, numerical permeability results for certain geometries
were compared to the values obtained by finite-difference and finite-element methods.
All numerical results were found to be in close agreement. The resolution of
the tomographic reconstructions is limited causing discretisation uncertainty in the
numerical analysis. The reliability of the numerical results was estimated by performing
simulations for high and low resolution lattices. These results were further
compared to the corresponding analytical solutions. The discretisation uncertainty
was found not to be essentially larger than the typical total uncertainty of the experimental
results. The advantage of the combination of x-ray tomography and numerical
methods arises in the cases where direct experimental measurements are not
feasible. An example of such an application, reported in this thesis, is to analyse the
permeability of individual, distinct layers in a layer-structured material in order to
determine the contribution of this layer to the overall permeability.
In the final part of the work, tomographic reconstructions of porous heterogeneous
materials were combined to a void space segmentation analysis. The utilisation
of the method was demonstrated by running the analyses for a series of tomographic reconstructions of liquid packaging boards. The methods facilitate e.g. the
analysis between the structural characteristics of pore structure and their relation
to imbibition process. Demonstration analyses indicate the void space segmentation
analysis to give valuable information on correlations between the structure of
porous heterogeneous materials and their fluid flow properties.
...
Publisher
University of JyväskyläISBN
978-951-39-4033-1ISSN Search the Publication Forum
0075-465XContains publications
- Artikkeli I: Koivu, V., Mattila, K., & Kataja, M. (2009). A Method for Measuring Darcian Flow Permeability of Thin Fibre Mats. Nordic Pulp and Paper Research Journal, 24(4), 395. DOI: 10.3183/npprj-2009-24-04-p395-402
- Artikkeli II: Koivu, V., Decain, M., Geindereau, C., Mattila, K., Alaraudanjoki, J., Bloch, J.-F., & Kataja, M. (2009). Flow permeability of fibrous porous materials. Micro-tomography and numerical simulations. In Trans. 14th Research Fundamental Symposium, Oxford (S.J. I’Anson, ed.), September 14-18 th, 2009, FRC, (pp. 437).
- Artikkeli III: Koivu, V., Decain, M., Geindreau, C., Mattila, K., Bloch, J.-F., & Kataja, M. (2010). Transport properties of heterogeneous materials. Combining computerised X-ray micro-tomography and direct numerical simulations. International Journal of Computational Fluid Dynamics, 23(10), 713-721. DOI: 10.1080/10618561003727512
- Artikkeli IV: Koivu, V., Seppänen, R., Turpeinen, T., Mattila, K., Hyväluoma, J., & Kataja, M. (2010). Combining x-ray micro-tomography and image analysis to study imbibition and void space in liquid packaging board. Journal of Pulp and Paper Science, 36(3-4), 1-8.
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