Thin-layer drying behaviour of dill leaves samples under three different infrared radiation power intensities was investigated. Diffusion Approach was found to be the best model that describes the drying behaviour of dill leaves. Effective diffusivity values were 6.97 × 10−9, 6.84 × 10−9 and 8.96 × 10−9 m2/s for power intensities of 1790, 1970 and 2070 W/m2, respectively. According to the first and second law efficiencies, the infrared drying system was more efficient at higher power intensities (p < 0.05). However, the total colour change was maximum at the highest power intensity. For the investigated infrared drying conditions, 1970 W/m2 was recommended as the best-infrared power intensity applied for drying of dill leaves by taking into account both performance analyses and quality changes.

中文翻译：

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莳萝叶的红外干燥：干燥特性、温度分布、性能分析和颜色变化

研究了三种不同红外辐射强度下莳萝叶样品的薄层干燥行为。发现扩散方法是描述莳萝叶干燥行为的最佳模型。对于 1790、1970 和 2070 W/m2 的功率强度，有效扩散率值分别为 6.97 × 10-9、6.84 × 10-9 和 8.96 × 10-9 m2/s。根据第一和第二定律效率，红外干燥系统在更高的功率强度下更有效（p < 0.05）。然而，在最高功率强度下，总颜色变化最大。对于所研究的红外干燥条件，考虑到性能分析和质量变化，建议将 1970 W/m2 作为用于干燥莳萝叶的最佳红外功率强度。