R. Younsi,∗ D. Kocaefe,∗∗ S. Poncsak,∗ and T. Junjun∗∗
Mathematical modelling, Luikov’s model, conjugate problem, high-temperature wood treatment, heat and mass transfer, validation
In the current work, the three-dimensional Navier–Stokes equations along with the energy and concentration equations for the fluid coupled with the energy and mass conservation equations for the solid (wood) are solved to study the transient heat and mass transfer during the heat treatment of wood. The model for wood is based on Luikov’s approach and solves a set of coupled heat and mass transfer equations. The model equations are solved numerically for the temperature and moisture content histories under different treatment conditions. The simulation of the proposed conjugate problem allows the assessment of the effect of the heat and mass transfer within wood on the transfer in the adjacent gas, providing good insight on the complexity of the transfer mechanisms. To generate data for comparison, measurements of temperature and moisture content of wood samples in a thermogravimetric system were conducted under different operating conditions. It is shown that the predicted and measured values compared very favourably, implying that the proposed numerical algorithm can be used as a useful tool in designing high-temperature wood treatment processes.
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