Department of Mechanical Engineering, Birla Institute of Technology, Ranchi, India.
J Food Sci. 2023 May;88(5):1800-1815. doi: 10.1111/1750-3841.16525. Epub 2023 Mar 20.
In this communication, a combination of heat and mass transfer model was developed using finite element (FE) model to explain the drying performance of the hybrid greenhouse dryer for potato chips. The hybrid greenhouse dryer is integrated with a single-pass solar air heater (SAH). A partial differential equation for a combined set of heat and mass transfer was numerically solved by the FE method. In order to see the spatial moisture distribution within the potato sample, a 3-dimensional FE model was created, and moisture removal takes place from the surface during drying of the products. Lagrange triangle FEs of extremely small size and second-order geometry shape were employed for meshing the geometry of model. Time-dependent study was express the fluctuation in time interval of 0-5 h. The developed model showed the maximum crop and ground temperature are 67.1 and 79.1°C, respectively. Moisture ratio in dry basis is reduced from 1 to 0.005 in 03 h and remains constant at 0.005. Thus, average moisture ratio in dry basis was found as 0.18902. Drying efficiency for the hybrid greenhouse dryer found to be 20.52%, whereas thermal efficiency for SAH was found 54.53%. Relative humidity inside the drying chamber found to be 26.50% in hybrid greenhouse dryer. The predicted versus the experimental results observed that hybrid greenhouse dryer having moderate inside temperature is suitable for crop drying as well as ith sustaining the environmental balance, hybrid greenhouse proves to be most effective.
在本通讯中，使用有限元（FE）模型开发了传热传质模型组合，以解释土豆片混合式温室干燥机的干燥性能。混合式温室干燥机与单程太阳能空气加热器（SAH）集成在一起。通过 FE 方法数值求解了一组组合的热质传递偏微分方程。为了观察土豆样品内部的空间水分分布，创建了一个三维 FE 模型，并在产品干燥过程中从表面去除水分。采用极小尺寸和二阶几何形状的拉格朗日三角形 FE 对模型的几何形状进行了网格划分。时变研究表达了 0-5 小时时间间隔内的波动。所开发的模型显示，作物和地面的最高温度分别为 67.1°C 和 79.1°C。干基含水率从 0 到 03 小时减少到 0.005，在 0.005 时保持不变。因此，干基平均含水率为 0.18902。混合式温室干燥机的干燥效率为 20.52%，而 SAH 的热效率为 54.53%。在混合式温室干燥机内，干燥室内的相对湿度为 26.50%。预测值与实验结果的对比表明，混合式温室干燥机内部温度适中，适合作物干燥，并维持环境平衡，混合式温室证明是最有效的。
