Drying Kinetics of American Ginseng Slices in Thin-layer Air Impingement Dryer
Drying Kinetics of American Ginseng Slices in Thin-layer Air Impingement Dryer
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DOI：
10.1515/ijfe-2015-0002
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发表时间：
2015-09
影响因子：
1.6
通讯作者：
Dong Wang;Jian-Wu Dai;H. Ju;Longhan Xie;Hongwei Xiao;Yanhong Liu;Zhen-jiang Gao
中科院分区：
文献类型：
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作者：
Dong Wang;Jian-Wu Dai;H. Ju;Longhan Xie;Hongwei Xiao;Yanhong Liu;Zhen-jiang Gao
摘要 研究了不同干燥温度（35、40、45、50、55、60和65°C）、风速（3、6、9和12 m/s）和样品厚度（1、2、3和4 mm）下西洋参片的薄层空气冲击干燥动力学。结果表明，干燥时间受干燥温度的影响更为显着，其次是样品厚度和风速。干燥速率曲线表明整个干燥过程发生在速率下降期间。另外，从干燥初期到含水量约为0.5 kg/kg，干燥速率随着干燥温度和风速的增加而增大，或随着样品厚度的增加而减小。水分有效扩散率（Deff）是在忽略收缩和考虑收缩的情况下确定的。根据阿伦尼乌斯关系式测定西洋参片的干燥活化能为46.64 kJ/mol。将西洋参片的水分有效扩散率和干燥活化能与其他生物材料进行了比较，并讨论了相关问题。本工作对于空气冲击干燥系统的设计、西洋参片能耗的评价和节约具有一定的参考价值。
Abstract Thin-layer air impingement drying kinetics of American ginseng slices were investigated under different drying temperatures (35, 40, 45, 50, 55, 60, and 65°C), air velocities (3, 6, 9, and 12 m/s), and sample thicknesses (1, 2, 3, and 4 mm). Results indicated that the drying time is more significantly affected by drying temperature followed by sample thickness and air velocity. Drying rate curves illustrated that the whole drying process happened in the falling rate period. Additionally, from initial drying to the moisture content of about 0.5 kg/kg, the drying rate increased with the increase of drying temperature and air velocity or decreased with the increase of sample thickness. The moisture effective diffusivity (Deff) was determined both neglecting shrinkage and considering shrinkage. The drying activation energy of American ginseng slices was 46.64 kJ/mol determined by Arrhenius relationship. The moisture effective diffusivity and drying activation energy of American ginseng slices were compared to other biomaterials and related issues were also discussed. The current work is useful for designing air impingement drying system, evaluating and saving energy consumption of American ginseng slices.