Thin-Layer Drying Characteristics and Modeling of Chinese Jujubes
Thin-Layer Drying Characteristics and Modeling of Chinese Jujubes
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大枣的薄层干燥特性及模拟
DOI：
10.1155/2012/386214
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Luo, Hua-Ping
中科院分区：
文献类型：
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作者：
Yi, Xiao-Kang;Wu, Wen-Fu;Luo, Hua-Ping
在控制温度和速度的条件下，建立了对流干燥机内菜籽薄层干燥的数学模型。干燥过程同时发生在加速期和降速期。我们观察到，较高的温度减少了干燥时间，表明更高的干燥速率。利用干燥实验数据拟合了10种不同的薄层干燥模型，并利用统计计算机程序进行了非线性回归分析，确定了各模型的干燥速率常数和系数。对于所有的干燥模型，威布尔分布模型是上级和最好的预测实验值。因此，该模型可用于辅助干燥机的设计，并通过模拟和优化干燥过程来促进干燥机的高效运行。随着干燥空气温度的升高，纤维的体积收缩系数减小。
A mathematical modeling of thin-layer drying of jujubes in a convective dryer was established under controlled conditions of temperature and velocity. The drying process took place both in the accelerating rate and falling rate period. We observed that higher temperature reduced the drying time, indicating higher drying rates of jujubes. The experimental drying data of jujubes were used to fit ten different thin-layer models, then drying rate constants and coefficients of models tested were determined by nonlinear regression analysis using the Statistical Computer Program. As for all the drying models, the Weibull distribution model was superior and best predicted the experimental values. Therefore, this model can be used to facilitate dryer design and promote efficient dryer operation by simulation and optimization of the drying processes. The volumetric shrinkable coefficient of jujubes decreased as the drying air temperature increased.