摘要
粮食的干燥过程实质上是多孔介质热湿耦合传递的过程。基于多孔介质热质传递理论,通过数值模拟的方法,针对利用太阳能辅助热泵干燥粮食时热风随时间变化的情况,采用综合温度和空气绝对湿度作为瞬态边界条件来对干燥过程中粮食内部温度和水分的变化进行模拟研究。模拟结果显示小麦水分在干燥150 h后达到安全水分13.6%(干基),而实验结果显示小麦水分在干燥135 h后达到安全水分13.6%(干基),二者对比相差不大,并且模拟温度与试验温度吻合较好。
Grain drying process actually transfers heat and mass in porous media.Based on the theory of heat and mass transfer in porous media,it was used to simulate the changes of grain temperature and moisture content by the way of CFD,while setting transient boundary conditions of outdoor integrated temperature and absolute humidity.The simulation results show that the moisture content reach safety moisture content 13.6%（dry basis） after 150 hours drying,while the experiment costs 135 hours to reach safety moisture content,and there is little differences.Furthermore the simulation temperature is coincident well with the experimental temperature.
出处
《粮食储藏》
2012年第2期7-12,共6页
Grain Storage
基金
山东省自然基金项目(ZR2011EEM011)
济南市科技发展计划项目(No.200906044)
关键词
粮堆
太阳能
热泵
热湿传递
数值模拟
瞬态边界
bulk grains
solar energy
heat pump
heat and moisture transfer
numerical simulation
transient boundary condition
