考虑压力和含水率影响的小麦粮堆导热特性数值研究  

Numerical Study of Thermal Conductivity Characteristics of Wheat Grain Bulk Considering the Effects of Pressure and Water Content

作　　者：蒋敏敏 曹会敏[1,2] 王清山 柴威丽 JIANG Minmin;CAO Huimin;WANG Qingshan;CHAI Weili(Henan Key Laboratory of Grain and Oil Storage Facility&Safety,HAUT,Zhengzhou 450001,China;College of Civil Engineering,Henan University of Technology,Zhengzhou 450001,China;Engineering Research Institute,China Construction Seventh Engineering Division.Crop.Ltd,Zhengzhou 450004,China)

机构地区：[1]河南省粮油仓储建筑与安全重点实验室,河南郑州450001 [2]河南工业大学土木工程学院,河南郑州450001 [3]中国建筑第七工程局有限公司工程研究院,河南郑州450004

出　　处：《河南科技》2024年第1期80-85,共6页Henan Science and Technology

基　　金：国家自然基金项目(51408197);省属高校基本科研业务费专项资金项目(2020ZKCJ05);河南省教育厅自然科学项目(23B560002);河南省粮油仓储建筑与安全重点实验室开放基金(2021KF-B03)。

摘　　要：【目的】研究小麦粮堆压力—导热特性和含水率—导热特性的规律。【方法】使用孔隙率测定装置来测定小麦粮堆在不同压力(0 kPa、50 kPa、100 kPa、200 kPa、300 kPa)、不同含水率(8.50%、11.21%、14.45%、16.97%、20.72%)下的孔隙率,并在COMSOL有限元数值模拟软件中进行模拟分析。【结果】得到压力、含水率对粮堆孔隙率产生的影响,通过建立小麦粮堆的压力—导热特性数值模型,模拟不同压力和含水率下小麦颗粒的导热特性,得到粮堆压力—导热特性的规律。【结论】小麦颗粒的等效导热系数与孔隙率基本呈线性分布。单元体颗粒的等效导热系数范围为0.1095~0.1572 W/(m·K),粮堆等效导热系数随上覆压力的增大而增大,当含水率为8.5%~20.72%,上覆压力为300 kPa时,导热系数增大17.5%~27.5%。[Purposes]The research aimed to study the law of pressure-thermal conductivity and moisture content-thermal conductivity of wheat grain bulk.[Methods]The porosity measurement device was used to measure the porosity of wheat grain piles under different pressures(0 kPa,50 kPa,100 kPa,200 kPa,300 kPa)and different moisture contents(8.50%,11.21%,14.45%,16.97%,20.72%),and the simulation analysis was carried out in COMSOL finite element numerical simulation software.[Findings]The effects of pressure and moisture content on the porosity of grain bulk were obtained.By establishing the numerical model of pressure-thermal conductivity characteristics of wheat grain bulk,the thermal conductivity characteristics of wheat particles under different pressures and moisture contents were simulated,and the law of pressure-thermal conductivity characteristics of grain bulk was obtained.[Conclusions]The equivalent thermal conductivity and porosity of wheat particles were basically linear distribution.The equivalent thermal conductivity of the unit particles ranges from 0.1095 W/(m·K)to 0.1572 W/(m ·K).The equivalent thermal conductivity of the grain pile increases with the increase of the overlying pressure.When the moisture content is 8.5%~20.72% and the overlying pressure is 300 kPa,the thermal conductivity increases by 17.5%~27.5%.

关 键 词：上覆压力 含水率 导热特性 数值模拟 

分 类 号：S379[农业科学—农产品加工]