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For subsequent simulations a pre-drying phase was introduced to accommodate the initial MC gradient set-up before drying, as previously described. Essentially, the pre-drying phase begins with cross-sections with no initial gradient, but with the previously established shifted initial average core MC. The simulation is then run under constant, mild drying conditions until the average cross-sectional MC reaches the experimental initial average MC, thus setting up a gradient in the cross-section reflecting the condition of material immediately prior to drying. The pre-drying conditions used were: 25 °C dry-bulb temperature, 20 °C wet-bulb temperature, 2 m/s airflow and ambient pressure (1 bar). After the pre-drying phase, the simulation automatically ‘restarts’ using the experimental drying conditions and the MC field established at the finalisation of the pre-drying phase. The MC simulation results validated against the actual trial drying curves are presented in Figure 77 to Figure 80 and Table 72 for each species. The use of the pre-drying phase on matching the MC core simulated and experimental results shows a higher degree of accuracy than previous simulations. Additionally, the incorporation of a pre-drying phase reflects the actual situation during the start of industrial wood drying whereby a degree of MC gradient exists in board cross-sections. 0.4 0.3 0.2 0.1 0 0 150 Time (hrs) 200 250 0.8 0.6 0.4 0.2 0 0 Model - surface Model - core Experiment - core Model - surface Model - core Experiment - core 50 100 200 400 600 Time (hrs) Figure 77. Transpore 2-D moisture content simulation results for C. citriodora using measured diffusion coefficient and pre-drying phase Figure 79. Transpore 2-D moisture content simulation results for E.pilularis using measured diffusion coefficient and pre-drying phase 0.8 0.6 0.4 0.2 0 0 200 Figure 78. Transpore 2-D moisture content simulation results for E. marginata using measured diffusion coefficient and pre-drying phase 600 1.0 0.8 0.6 0.4 0.2 0 0 Model - surface Model - core Experiment - core Model - surface Model - core Experiment - core Time (hrs) 400 200 400 Time (hrs) Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report Figure 80. Transpore 2-D moisture content simulation results for E.obliqua using measured diffusion coefficient and pre-drying phase 113 600 800 1000 Moisture content (%/%) Moisture content (%/%) Moisture content (%/%) Moisture content (%/%)PDF Image | Evaluation of super-heated steam vacuum drying
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