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Thin layer drying characteristics of kidney beans

机译：菜豆的薄层干燥特性

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Thin layer drying characteristics of kidney beans were measured for several drying conditions involving five temperatures (25, 30, 35, 40, 45℃) and several relative humilities between 15 and 40% for each temperature. It was confirmed that thedrying of kidney beans was in the second falling rate period, because the drying characteristics curves showed that the drying rate fell off decreasingly, describing a gentle curve accordingly as the moisture content decreased. Using the measured data,parameter B{sub}1 was determined by applying a non-linear least squares method to an approximate solution of the diffusion equation and values of B{sub}1 were about 0.8. Therefore, the measured data were fitted to two exact solutions for the infiniteplane sheet model in the diffusion equation by a non-linear least squares method, and the measured results agreed well with the calculated results. It was confirmed that the infinite plane sheet model for the diffusion equation was most suitable todescribe the thin layer drying characteristics of kidney beans. An Arrhenius type equation was used to relate the drying rate constant K of kidney beans to temperature T and it had a good fit to the experimental data.
机译：在几种干燥条件下测量了芸豆的薄层干燥特性，这些条件涉及五个温度（25、30、35、40、45℃），每种温度下相对湿度在15％至40％之间。证实了芸豆的干燥处于第二下降速率时期，这是因为干燥特性曲线表明干燥速率逐渐降低，随着水分含量的降低而描绘出缓和的曲线。使用测量数据，通过对扩散方程的近似解应用非线性最小二乘法确定参数B {sub} 1，并且B {sub} 1的值约为0.8。因此，通过非线性最小二乘法将测量数据拟合到扩散方程中无限平面薄板模型的两个精确解，并且测量结果与计算结果吻合得很好。证实了用于扩散方程的无限平面薄片模型最适合描述芸豆的薄层干燥特性。使用阿伦尼乌斯（Arrhenius）型方程将芸豆的干燥速率常数K与温度T相关联，它与实验数据非常吻合。

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