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In the present work, numerical simulations on 3D images of Dalbergia ruddae wood are used to analyze the influence of porosity characteristics on the fluid flow through it. Image acquisition was performed with X-ray computed tomography. Flow throughout the three main directions, longitudinal, radial and tangential is estimated by numerical simulation inside sapwood and heartwood tissue. Numerical simulations were performed on images of wood tissue without vessels, only vessels and the complete wood tissue by virtual separation of each phase. Results indicate that flow through the vessels is obstructed by the presence of gums, which reduces their permeability in the longitudinal direction, causing flow in that direction to be conducted through gaps in the fibers and parenchyma. In the radial direction, gums do not hinder flow within the vessel unlike in the tangential direction. The estimation of permeability in the segmented tissues indicates the null contribution of the vessel when is obstructed by gums and the high contribution of the axial parenchyma to the flow of fluid encapsulated in a vessel. Flow lines illustrate the flow pathways throughout the woody tissue, which made it possible to highlight the flow problem in this species as vessel-encapsulated flow.

Analyzing the bulk flow through porosity of Dalbergia ruddae wood by coupling 3D image analysis and numerical simulations