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4.5 Drying modelling - Vacuum drying modelling At the time of running model simulations, not all vacuum drying trials were completed. For model validation, one vacuum drying trial was chosen per species. We chose the trial that, to date, had produced the best-dried quality outcome in the quickest drying time (most optimised). The vacuum drying trials chosen were the E. obliqua trial MES8, C. citriodora trial SPG9, E. marginata trial JAR10 and E. pilularis trial BBT11. 4.5.1 Input parameters The static (scalar) input simulation parameters are presented in Table 68. Most input parameters have been measured as part of this project and are reported here in sections 4.1 Applied drying – Experimental drying trials and 4.3 Drying modelling - Measurement of kiln conditions and wood drying properties. We have calculated some parameters via theory as discussed in section 3.5 Drying modelling - Vacuum drying modelling. The liquid phase absolute permeabilities were calculated the same as measured gas phase absolute permeabilites, due to the lack of pit aspiration in hardwoods. We presumed the initial wood temperature based on average Queensland climatic conditions prior to drying. Table 68. Measured and calculated model input static wood property and drying condition data Static Wood Properties and Drying Conditions Wood density Porosity Radial direction Absolute Permeabilities Gas phase Liquid phase Tangential direction Absolute permeabilites Gas phase Liquid phase Initial moisture content Fibre saturation point Initial temperature Woodcross-section Direction Sorption isotherm parameters (equation 22) Corymbia citriodora (spotted gum) 859 kg m3 0.07 1.0 x 10-22 m2 1.0 x 10-22 m2 3.4 x 10-21 m2 3.4 x 10-21 m2 31.9 % 23.3 % 25 °C Eucalyptus marginata (jarrah) 695 0.26 4.9 x 10-20 m2 4.9 x 10-20 m2 4.4 x 10-16 m2 4.4 x 10-16 m2 62.1% 24.5% 25 °C Eucalyptus pilularis (blabkbutt) 833 0.28 Eucalyptus obliqua (messmate) 576 0.37 8.6 x 10-18 m2 8.6 x 10-18 m2 2.9 x 10-19 m2 2.9 x 10-19 m2 84.9 % 31.4 % 25 °C Measured Calculated 25 °C 100mmx28mm 113mmx31mm 113mmx28mm 110mmx30mm Width (T) x Thickness (R) Width (T) x Thickness (R) Width (T) x Thickness (R) Width (R) x Thickness (T) C1 = 1.0047 C2 = 0.9076 C1 = 0.9716 C2 = 0.8401 C1 = 1.1847 C2 = 0.7211 C1 = 0.808 C2 = 2.2796 1.4 1.4 1.7 1.7 x 10-20 m2 x 10-20 m2 x 10-20 m2 x 10-20 m2 51.1% 24.5% Dynamic drying condition and wood property data, expressed as equations and associated polynomial parameters are shown in Table 69. We derived these equations by fitting curves to measured kiln and wood property data using TableCurve 2-D curve fitting software. We measured wood properties from single board samples during kiln drying trials where global kiln drying conditions were also measured. Drying trials and associated wood property measurements are detailed previously in this report.PDF Image | Evaluation of super-heated steam vacuum drying
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