MODELING AND SIMULATION OF HEAT-AND-MASS TRANSFER IN WOOD DURING THERMAL TREATMENT IN СО2 ENVIRONMENT
DOI:
https://doi.org/10.36930/Keywords:
high-temperature wood treatment, carbon dioxide environment, mathematical modeling, capillary-porous media, multiphase model, heat and moisture transferAbstract
A three-dimensional mathematical model, for simultaneous heat and mass transfer taking place during the high temperature treatment of wood in carbon dioxide environment, has been developed. The mathematical description of wood modification process is derived substantially for treatment in carbon dioxide, taking into account the peculiarities of carbonic acid using as a processing environment. Set of fundamental heat- and masstransfer mechanisms is coupled with thermodynamic phase equilibrium expressions in a way that have meaning for hygroscopic capillary-porous media. Heat transfer by both conduction and convection is included together with mass transfer by gaseous diffusion and liquid through the void space and by bound-water diffusion through the solid matrix. The equations of the model were solved numerically using the software Femlab® for the temperature and moisture content profiles. Calculated model predictions are in very satisfactory agreement with experimental results.
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