Abstract Dielectric properties of canola seeds, corn, paddy rice, soybean and wheat were studied to determine the dependence of dielectric properties on frequency, moisture content and density of powdered seeds. In this context, several tests were done to find the relationship between the dielectric properties of the seeds at different frequencies (0.6–3 GHz) and at different moisture contents. Experimental data were used to parameterize standard linear models to predict the dielectric constant and loss factor. The resulting models were used in the prediction of heat and mass transfer parameters in a microwave (MW) assisted hot-air dryer at operating conditions of air temperature of 65 °C, a MW power density of 0.3 W g−1, and for an exposure time of 30 min. The predicted results were in good agreement with experimental results obtained under the studied drying conditions. Germination tests were performed before and after each drying test to study the effects of the adopted drying conditions on the selected seeds. The results showed that the germination rate decreased for soybean but not for corn seed. This may be due to the hardness of the corn seed compared to that of soybean and also due to the grain density, which is higher for corn than of soybean.

中文翻译：

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种子介电特性建模研究以改进微波辅助热风干燥的数学建模

摘要 研究了油菜籽、玉米、水稻、大豆和小麦的介电特性，以确定介电特性对频率、水分含量和粉状种子密度的依赖性。在此背景下，进行了多项测试以找出不同频率 (0.6-3 GHz) 和不同水分含量下种子的介电特性之间的关系。实验数据用于参数化标准线性模型以预测介电常数和损耗因子。所得模型用于在空气温度为 65 °C、MW 功率密度为 0.3 W g-1 的操作条件下预测微波 (MW) 辅助热空气干燥器中的传热和传质参数，并用于曝光时间 30 分钟。预测结果与在研究的干燥条件下获得的实验结果非常一致。在每次干燥试验之前和之后进行发芽试验，以研究所采用的干燥条件对所选种子的影响。结果表明，大豆的发芽率下降，而玉米种子的发芽率没有下降。这可能是由于与大豆相比，玉米种子的硬度以及玉米的谷物密度高于大豆。