To understand the complex continuous microwave drying of germinated brown rice (GBR) and clarify the drying characteristics, the heat and mass transfer of GBR under continuous microwave drying was investigated numerically and experimentally. A three-dimensional model of coupled multi-physics fields involving the transmission of microwave field, heat transfer and mass (moisture) transfer was developed to characterise the drying process of GBR in a continuous microwave dryer. The implementation strategy based on discrete-combined approach was proposed to achieve the simulation of continuous microwave drying of moving materials with the mutual cooperation of the computer simulation software and independently developed program code. For the continuous microwave drying of GBR, the relatively uniform distribution of electric field strength applied to the grain layer depended on the reasonable arrangement pattern of magnetrons and suitable microwave power output. The movement of materials can effectively reduce excessive absorption of microwave energy by the grain layer, and achieve uniform distribution of temperature and moisture content and high drying uniformity assisted by the synergistic effects of microwave heating, moisture evaporation and ventilation convection. The developed model and simulation strategy may provide guidance for understanding and analysis of continuous microwave drying process of granular materials such as GBR.

中文翻译：

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连续微波干燥发芽糙米移动干燥过程建模及干燥特性分析

为了解发芽糙米 (GBR) 复杂的连续微波干燥并阐明干燥特性，对连续微波干燥下发芽糙米的传热传质进行了数值和实验研究。开发了一个涉及微波场传输、传热和质量（水分）传递的耦合多物理场的三维模型，以表征连续微波干燥机中 GBR 的干燥过程。提出了基于离散组合方法的实现策略，通过计算机仿真软件和自主开发的程序代码相互配合，实现对运动物料连续微波干燥的仿真。对于GBR的连续微波干燥，施加到晶粒层的电场强度分布相对均匀取决于磁控管的合理排列方式和合适的微波功率输出。物料的运动可有效减少粒层对微波能量的过度吸收，并在微波加热、水分蒸发和通风对流的协同作用下，实现温度和水分的均匀分布和高干燥均匀性。所开发的模型和模拟策略可为理解和分析GBR等颗粒材料的连续微波干燥过程提供指导。物料的运动可有效减少粒层对微波能量的过度吸收，并在微波加热、水分蒸发和通风对流的协同作用下，实现温度和水分的均匀分布和高干燥均匀性。所开发的模型和模拟策略可为理解和分析GBR等颗粒材料的连续微波干燥过程提供指导。物料的运动可有效减少粒层对微波能量的过度吸收，并在微波加热、水分蒸发和通风对流的协同作用下，实现温度和水分的均匀分布和高干燥均匀性。所开发的模型和模拟策略可为理解和分析GBR等颗粒材料的连续微波干燥过程提供指导。