CFD modeling and experimental validation of heat and mass transfer in wood poles subjected to high temperatures: a conjugate approach |
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Authors: | R Younsi D Kocaefe S Poncsak Y Kocaefe L Gastonguay |
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Affiliation: | (1) Applied Sciences, University of Quebec at Chicoutimi, 555 Boul.de l’université, Chicoutimi, Chicoutimi, Canada, G7H 2B1;(2) Research Institute of Hydro-Quebec, 1800, boul. Lionel-Boulet Varennes, Quebec, Canada, J3X 1S1 |
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Abstract: | In this article, a coupling method is presented in the case of high thermal treatment of a wood pole and a three-dimensional
numerical simulation is proposed. The conservation equations for the wood sample are obtained using diffusion equation with
variables diffusion coefficients and the incompressible Reynolds averaged Navier–Stokes equations have been solved for the
flow field. The connection between the two problems is achieved by expressing the continuity of the state variables and their
respective fluxes through the interface. Turbulence closure is obtained by the use of the standard k–ɛ model with the usual
wall function treatment. The model equations are solved numerically by the commercial package ANSYS-CFX10. The wood pole was
subjected to high temperature treatment under different operating conditions. The model validation is carried out via a comparison
between the predicted values with those obtained experimentally. The comparison of the numerical and experimental results
shows good agreement, implying that the proposed numerical algorithm can be used as a useful tool in designing high-temperature
wood treatment processes. A parametric study was also carried out to determine the effects of several parameters such as initial
moisture content, wood aspect ratio and final gas temperature on temperature and moisture content distributions within the
samples during heat treatment. |
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Keywords: | Conjugate problem Heat transfer and moisture High-temperature wood treatment CFD Validation |
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