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Lattice Boltzmann simulations of diffusion through native and steam-exploded softwood bordered pits

Patric Kvist (Institutionen för kemi och kemiteknik, Kemisk apparatteknik ; SuMo Biomaterials) ; Adam Therning (Institutionen för kemi och kemiteknik) ; Tobias Gebäck (Institutionen för matematiska vetenskaper, Tillämpad matematik och statistik ; SuMo Biomaterials) ; Anders Rasmuson (Institutionen för kemi och kemiteknik, Kemisk apparatteknik)
Wood Science and Technology (0043-7719). Vol. 51 (2017), 6, p. 1261-1276.
[Artikel, refereegranskad vetenskaplig]

Bordered pits connect adjacent tracheid cells in softwoods and enable water transport between them. Knowledge of how large molecules, such as polysaccharides and enzymes, are transported through pits is important to understand the extraction process of valuable biopolymers from wood. The main mass transport mechanism for large dissolved molecules in wood is diffusion, and this is investigated through mathematical modeling in the lattice Boltzmann framework utilizing SEM images and 3D reconstruction of an actual bordered pit to compute an effective diffusion coefficient. Confocal laser scanning microscopy is used to find the unobstructed diffusion coefficients in a free aqueous solution using fluorescent diffusion probes of dextran. The effect of steam explosion on pit structure is explored through the use of a simplified model. The importance of different components of a bordered pit is investigated using simulation data, and results show that the most important structural features are the borders. Expressions for the effective diffusion coefficient as a function of the free diffusion coefficient are presented for a native and for a steam-exploded pit, respectively.



Denna post skapades 2017-11-10. Senast ändrad 2017-11-10.
CPL Pubid: 253054

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Kemisk apparatteknik
SuMo Biomaterials
Institutionen för kemi och kemiteknik
Institutionen för matematiska vetenskaper, Tillämpad matematik och statistikInstitutionen för matematiska vetenskaper, Tillämpad matematik och statistik (GU)

Ämnesområden

Fysikalisk kemi

Chalmers infrastruktur