A multi-scale model for diffusion of large molecules in steam-exploded wood
Artikel i vetenskaplig tidskrift, 2020

In this paper, multi-scale modeling was used to resolve diffusion in steam-exploded wood at tracheid scales including sub-micrometer features of bordered pits. Simulations were performed using the lattice Boltzmann method with high-resolution X-ray tomography image data as the input for the microstructure. The results show an effective method for utilizing a variable diffusion coefficient to implement two length scales. This circumvents the need to resolve the bordered pits in detail, which requires massive computing power. Instead, the effective diffusion coefficient for one bordered pit is used as input for this model. Results based on the present model are comparable to experimental data. This methodology can be extended to more structural features at the microscale of wood, such as latewood and the cell wall. Obtaining a map of different diffusion coefficients based on features and scale gives a better overall understanding of diffusion and the importance of mass transport with regard to the pretreatment of wood.

Författare

Patric Kvist

SuMo Biomaterials

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparatteknik

Kungliga Tekniska Högskolan (KTH)

Tobias Gebäck

SuMo Biomaterials

Chalmers, Matematiska vetenskaper, Tillämpad matematik och statistik

Anders Rasmuson

SuMo Biomaterials

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparatteknik

Wood Science and Technology

0043-7719 (ISSN) 1432-5225 (eISSN)

Vol. 54 4 821-835

Ämneskategorier

Energiteknik

Bioinformatik (beräkningsbiologi)

Datorseende och robotik (autonoma system)

DOI

10.1007/s00226-020-01185-2

Mer information

Senast uppdaterat

2020-08-28