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
蒋敏敏 1曹会敏 1王清山 2柴威丽1
作者信息
- 1. 河南省粮油仓储建筑与安全重点实验室,河南 郑州 450001;河南工业大学土木工程学院,河南 郑州 450001
- 2. 河南省粮油仓储建筑与安全重点实验室,河南 郑州 450001;河南工业大学土木工程学院,河南 郑州 450001;中国建筑第七工程局有限公司工程研究院,河南 郑州 450004
- 折叠
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0.109 5～0.157 2 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%.
Abstract
[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 numeri-cal 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 0.109 5 W/(m·K)to 0.157 2 W/(m·K).The equivalent thermal conductivity of the grain pile increases with the increase of the overlying pres-sure.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Key words
overburden pressure/water content/thermal conductivity characteristics/numerical simulation引用本文复制引用
基金项目
国家自然科学基金(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)
出版年
2024
NETL
NSTL
万方数据