摘要
粮食作为生物性多孔介质,具有呼吸特性。一般粮食收获后,大部分时间在密闭不通风状态下存储。以粮堆内局部热湿耦合传递过程作为研究对象,分析了不通风状态下的圆筒形粮仓在自然对流条件下由于温度梯度影响而产生近似冬夏季工况的温度分布和水分转移,借助多物理场数值模拟软件(COMSOL)进行数值模拟,将粮食呼吸作用产热、产湿量以热源、湿源项考虑在数学模型中,通过对温度场、水分场的描述指导工程实践。
Grain has respiration character because of it＇ s biological porousmedium. Grain had been generally stored in a closed space without ventilation after harvesting. This paper take the coupled heat and moisture transfer in part of grain bulk as research object to analyse the temperature distribution and moisture transfer just like in winter and summer caused by temperature difference at natural convection in cylindrical barn, with the help of multi--physics field numerical simulation software（COMSOL） to take numerical simulation with considering the heat and moisture sourse caused by grain respiration in the mathematical model. By analyzing the temperature field and moisture field to guide enigeering practice.
出处
《粮食储藏》
2014年第5期21-27,49,共8页
Grain Storage
基金
国家自然科学基金资助项目(No.51276102)
山东省自然科学基金资助项目(No.ZR2011EEM011)
关键词
生物性多孔介质
呼吸作用
多物理场数值模拟
biological porous medium, respiration, multi--physics numerical simulation, non--ventilation
