原粮表观热物性参数及含水率的快速测量方法
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摘要
为获得粮食的热物性参数和含水率之间的关系,采用圆柱型一维径向导热装置对粮食的导热系数,热扩散系数,比热容和吸热系数等热物性参数进行了有效测量,利用软件拟合可知粮食的含水率和吸热系数(λρc)~(1/2)关系的线形度更好,拟合得到的方程为y=150.42x-640.58。在此基础上设计了新型的探针测量装置,根据探针的孔壁的过余温度与时间关系可以直接得到吸热系数(λρc)~(1/2),根据此前实验得到的粮食的热物性参数和含水率之间的关系,即可快速得到粮食的含水率。
In order to obtain the relationship between the thermal property parameters and water content of raw grain,using cylindrical one-dimensional radial thermal conductivity device, thermal conductivity,thermal diffusivity,specific heat and heat absorption coefficient are calculated effectively. According to the results of optimum fitting to experimental data, the linear degree of the relation between the water content of grain and the heat absorption coefficient is better, the equation obtained by fitting is: y=150.42 x-640.58. On this basis, a new type of probe measuring device is designed. The heat absorption coefficient can be calculated directly according to the relationship between the excess temperature and the time of the hole wall of the probe. According to the relationship between the thermal physical parameters and water content of the grain calculated earlier, the water content of grain can be quickly obtained.
In order to obtain the relationship between the thermal property parameters and water content of raw grain,using cylindrical one-dimensional radial thermal conductivity device, thermal conductivity,thermal diffusivity,specific heat and heat absorption coefficient are calculated effectively. According to the results of optimum fitting to experimental data, the linear degree of the relation between the water content of grain and the heat absorption coefficient is better, the equation obtained by fitting is: y=150.42 x-640.58. On this basis, a new type of probe measuring device is designed. The heat absorption coefficient can be calculated directly according to the relationship between the excess temperature and the time of the hole wall of the probe. According to the relationship between the thermal physical parameters and water content of the grain calculated earlier, the water content of grain can be quickly obtained.
引文
[1]李亿凡.影响大米储藏原因分析及对策的探讨[J].粮油仓储科技通讯,2011,(4):53-54.
[2]杨玉芬,佟玲,张本华.快速检测粮食含水率的方法[J].农机化研究,2006,(4):201-203.
[3]张晓虎,李新平.几种常用土壤含水量测定方法的研究进展[J].陕西农业科学,2008,(6):114-117.
[4]Nagasaka Y,Nagashima A.A simultaneous measurement of the thermal conductivity and the thermal diffusivity of liquids by the transient hot-wire method[J].Rew Sci Instrum,1981,52:229-232.
[5]Gurova A N,Castro C N.The thermal conductivity of liquid halocarbons[C]//Nagashima A.Proceedings of the Fourth Asian Thermophysical Properties Conference.Tokyo:1995.129-132.
[6]Nagasaka Y,Nagashima A.Absolute measurement of the thermal conductivity of electrically conducting liquids by transient hot-wire method[J].J Phys E Sci Instrum,1981,14:1435-1440.
[7]张来林,李岩峰,毛广卿,等.用热线法测定粮食的导热系数[J].粮食与饲料工业,2010,(7):12-15.
[8]柳晓雷,王德林,方肇洪.垂直埋管地源热泵的圆柱面传热模型及简化计算[J].山东建筑工程学院学报,2001,(1):47-51.
[9]中国石油天然气股份有限公司,大庆油田有限责任公司,大庆油田工程有限公司.一种在线监测冻土总含水率的平面型传感器:CN201110442617.5[P].2012-07-11.
[10]孙国建,张辉,吕宁,等.粒状建筑物料热物性参数检测装置的实验研究[J].建筑热能通风空调,2015,(6):83-86.
[11]龚红菊.稻谷物性参数的实验测定[D].南京:南京农业大学,2003.
[12]段妍.土壤热物性参数测试及变化规律实验研究[D].太原:太原理工大学,2015.
[2]杨玉芬,佟玲,张本华.快速检测粮食含水率的方法[J].农机化研究,2006,(4):201-203.
[3]张晓虎,李新平.几种常用土壤含水量测定方法的研究进展[J].陕西农业科学,2008,(6):114-117.
[4]Nagasaka Y,Nagashima A.A simultaneous measurement of the thermal conductivity and the thermal diffusivity of liquids by the transient hot-wire method[J].Rew Sci Instrum,1981,52:229-232.
[5]Gurova A N,Castro C N.The thermal conductivity of liquid halocarbons[C]//Nagashima A.Proceedings of the Fourth Asian Thermophysical Properties Conference.Tokyo:1995.129-132.
[6]Nagasaka Y,Nagashima A.Absolute measurement of the thermal conductivity of electrically conducting liquids by transient hot-wire method[J].J Phys E Sci Instrum,1981,14:1435-1440.
[7]张来林,李岩峰,毛广卿,等.用热线法测定粮食的导热系数[J].粮食与饲料工业,2010,(7):12-15.
[8]柳晓雷,王德林,方肇洪.垂直埋管地源热泵的圆柱面传热模型及简化计算[J].山东建筑工程学院学报,2001,(1):47-51.
[9]中国石油天然气股份有限公司,大庆油田有限责任公司,大庆油田工程有限公司.一种在线监测冻土总含水率的平面型传感器:CN201110442617.5[P].2012-07-11.
[10]孙国建,张辉,吕宁,等.粒状建筑物料热物性参数检测装置的实验研究[J].建筑热能通风空调,2015,(6):83-86.
[11]龚红菊.稻谷物性参数的实验测定[D].南京:南京农业大学,2003.
[12]段妍.土壤热物性参数测试及变化规律实验研究[D].太原:太原理工大学,2015.