The spatial reaction engineering approach (S-REA) was used to simulate hot air drying of sawdust. The studies extended the previous work reported in literature where the sawdusts were dried using hot air at 70 °C, 80 °C, and 90 °C. The simulated results were found to agree well with the experimental moisture content (R² > 0.98) and temperature (R² > 0.82) profiles. In a further analysis using S-REA, the spatial profiles of moisture content and vapor concentration were generated to understand better the physics behind. Simulation also revealed that the external mass transfer resistance was more dominant as compared to the internal diffusion resistance. The vapor concentrations were observed peaked at time range of about 10 800– 18 000 s and dropped thereafter upon further heating. This observation could be supported by the variation in the vapor effective diffusivities where peak diffusivity values typically occur after most of the moisture evaporates towards the end of drying.

中文翻译：

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使用空间反应工程方法模拟对流干燥过程中木屑的水分扩散和蒸发

采用空间反应工程方法（S-REA）模拟木屑的热风干燥。这些研究扩展了文献中报道的先前工作，其中使用 70°C、80°C 和 90°C 的热空气干燥锯末。模拟结果与实验水分含量（ R ²  > 0.98）和温度（R ² > 0.82）曲线非常吻合。在使用 S-REA 进行的进一步分析中，生成了水分含量和蒸汽浓度的空间剖面，以更好地了解背后的物理原理。模拟还表明，与内部扩散阻力相比，外部传质阻力更占主导地位。观察到蒸气浓度在约 10 800–18 000 秒的时间范围内达到峰值，并在进一步加热后下降。这一观察结果可以通过蒸汽有效扩散率的变化来支持，其中峰值扩散率值通常出现在大部分水分蒸发接近干燥结束之后。