摘要
为保证稻谷在储藏时的品质,收获后的稻谷通常需要干燥到一定水分后储藏,研究稻谷干燥过程的热湿传递规律具有重要意义。目前稻谷干燥过程中热湿传递的分析大多基于连续介质假说和局部热湿平衡原理而进行的,这种方法的局限性在于很难获得粮堆干燥过程中粮粒内部的热湿迁移规律。研究基于稻谷粮堆孔隙尺度和粮粒尺度,采用局部非平衡热湿传递模型,模拟分析了在对流干燥条件下稻谷单颗粒以及颗粒群的热湿传递规律。研究结果表明,该模拟值与文献中干燥实验数据相对误差(RE)小于6.50%,平均相对偏差(MRD)小于4.00%,得出该模型具有一定的准确性;与基于局部热湿平衡多孔介质热湿耦合研究方法所得的稻谷颗粒群温度和水分传递结果进行对比,建立的模型更能准确体现出谷物颗粒在通风干燥时内部的热湿迁移规律,该模型能预测不同尺度下稻谷颗粒的温度和水分分布。
In order to ensure the quality of rice during storage,the harvested rice usually needs to be dried to a certain degree before storage.It is of great significance to study the law of heat and moisture transfer during drying of rice.At present,most analysis of heat and moisture transfer during drying of rice are based on the continuum hypothesis and the principle of local heat and moisture balance.The limitation of this method is that it is difficult to obtain the law of heat and moisture transfer inside the grain during pile drying.In this study,based on the pore scale and grain scale of rice pile,a local non-equilibrium heat and moisture transfer model was used to simulate and analyze the heat and moisture transfer of single grain and grain group of rice under convective drying condition.The results indicated that the Relative Error(RE)and the Mean Relative Deviation(MRD)between the simulated values and the drying experimental data in the literature were less than 6.50%and 4.00%,indicating that the model had certain accuracy.Compared with the model based on local heat and moisture balance,the model established in this study could more accurately reflect the internal heat and moisture migration law of rice particles during ventilation and drying.The model developed in this study could predict the temperature and moisture distribution of rice grains at different scales.
作者
李鑫
杨开敏
王远成
杜鑫明
Li Xin;Yang Kaimin;Wang Yuancheng;Du Xinming(Department of Thermal Engineering,Shandong Jianzhu University,Jinan 250101)
出处
《中国粮油学报》
CAS
CSCD
北大核心
2023年第12期60-68,共9页
Journal of the Chinese Cereals and Oils Association
基金
山东省高等学校“青创科技计划”项目(2019KJH012)。
关键词
稻谷干燥
多尺度
数值模拟
热湿耦合传递
rice drying
multi-scale
numerical simulation
coupled heat and moisture transfer
