Drying is the most widely used process to ensure the quality and stability of plant products. Therefore, this study aimed to determine the effective water diffusivity and activation energy in grain sorghum during drying at different temperatures and initial moisture contents. Sorghum grains (cultivar DeKalb 640) were harvested with an initial moisture content of 0.49 kg water kg(-1) dry matter. The effective diffusion coefficient was determined from different initial moisture contents of approximately 0.49, 0.40, 0.31, and 0.23 kg water kg(-1) dry matter. Grains with different moisture contents were dried under four temperature conditions of 40, 60, 80, and 100 degrees C on perforated trays. The spherical geometry model was used for liquid diffusion. The experiment was conducted in a completely randomized design in a 4 x 4 factorial scheme (four moisture contents x four temperatures), with three replications. Data were subjected to analysis of variance and regression using the statistical software SISVAR (R). Sorghum grain diffusivity increases at the same drying temperature as an increase of the initial moisture content of grains. The activation energy was higher for grains with higher initial moisture content, with values of 27.32, 26.75, 22.55, and 20.94 kJ mol(-1), respectively.
展开▼
机译：干燥是保证植物产品质量和稳定性应用最广泛的工艺。因此，本研究旨在确定不同温度和初始含水率下谷物高粱干燥过程中的有效水分扩散率和活化能。收获高粱籽粒（品种DeKalb 640），初始含水量为0.49 kg（-1）干物质。根据约0.49、0.40、0.31和0.23 kg水kg（-1）干物质的不同初始含水量确定有效扩散系数。将不同水分含量的谷物在40、60、80和100°C四种温度条件下在穿孔托盘上干燥。球形几何模型用于液体扩散。该实验以 4 x 4 因子方案（四个水分含量 x 四个温度）的完全随机设计进行，并重复三次。使用统计软件SISVAR（R）对数据进行方差和回归分析。高粱籽粒扩散率在相同的干燥温度下随着籽粒初始水分含量的增加而增加。初始含水率较高的籽粒活化能较高，分别为27.32、26.75、22.55和20.94 kJ mol（-1）。
展开▼
