烟草形态对烟草热物性的影响
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摘要
为了研究烟草形态(片状、丝状、粉状)对烟草热物性参数的影响,采用瞬态平面热源法测量了不同形态烟草堆积体的导热系数、热扩散系数和质量热容,分析了烟草形态对测量重复性、导热系数、质量热容以及热物性对温度敏感程度的影响。结果表明:(1)热物性参数测量重复性为导热系数>热扩散系数>质量热容;对于同一个热物性参数,烟草尺寸越小,测量重复性越好,即烟粉>烟丝>烟片。(2)随着堆积密度增大,烟草样品的导热系数逐渐增大,质量热容呈稍微减小的趋势。(3)烟草的特征尺寸越小,导热系数越小;烟片的导热系数对温度的敏感程度大于烟丝的导热系数对温度的敏感程度。
In order to investigate the influences of tobacco's shape(lamina,cut tobacco,powder) on its thermophysical properties,the thermal conductivity,thermal diffusivity and mass heat capacity of bulk tobacco were measured by the transient plane thermal source method,and the influences of tobacco's shape on measurement repeatability,thermal conductivity,mass heat capacity,and the temperature sensitivity of the said properties were analyzed.The results showed that: 1) The parameters of thermophysical properties in the descending order of measurement repeatability were thermal conductivity,thermal diffusivity,mass heat capacity.For an individual parameter,smaller tobacco particles presented higher measurement repeatability,in the order of tobacco powder > cut tobacco > tobacco lamina.2) With the increase of bulk density,thermal conductivity increased gradually,while mass heat capacity reduced slightly.3) Thermal conductivity reduced with the decrease of characteristic size of tobacco particles,and the thermal conductivity of lamina was more sensitive to temperature variation than that of cut tobacco.
In order to investigate the influences of tobacco's shape(lamina,cut tobacco,powder) on its thermophysical properties,the thermal conductivity,thermal diffusivity and mass heat capacity of bulk tobacco were measured by the transient plane thermal source method,and the influences of tobacco's shape on measurement repeatability,thermal conductivity,mass heat capacity,and the temperature sensitivity of the said properties were analyzed.The results showed that: 1) The parameters of thermophysical properties in the descending order of measurement repeatability were thermal conductivity,thermal diffusivity,mass heat capacity.For an individual parameter,smaller tobacco particles presented higher measurement repeatability,in the order of tobacco powder > cut tobacco > tobacco lamina.2) With the increase of bulk density,thermal conductivity increased gradually,while mass heat capacity reduced slightly.3) Thermal conductivity reduced with the decrease of characteristic size of tobacco particles,and the thermal conductivity of lamina was more sensitive to temperature variation than that of cut tobacco.
引文
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[2]舒芳誉,王道宽,林志平,等.HXD气流干燥过程工艺气流传热分析[J].烟草科技,2007(3):5-8.SHU Fangyu,WANG Daokuan,LIN Zhiping,et al.Heat transfer analysis of process gas in HXD[J].Tobacco Science&Technology,2007(3):5-8.
[3]刘泽,李斌,于川芳.复合传热对薄层烟丝干燥强化传质作用的动力学分析[J].烟草科技,2009(11):5-10.LIU Ze,LI Bin,YU Chuanfang.Dynamics analysis of multiple heat transfer impacts on intensive mass transfer daring thin layer drying processing of cut tobacco[J].Tobacco Science&Technology,2009(11):5-10.
[4]Mangal R,Saxena N S,Sreekala M S,et al.Thermal properties of pineapple leaf fiber reinforced composites[J].Materials Science and Engineering:A,2003,339(1):281-285.
[5]Kumcuoglu S,Tavman S,Nesvadba P,et al.Thermal conductivity measurements of a traditional fermented dough in the frozen state[J].Journal of Food Engineering,2007,78(3):1079-1082.
[6]Esfahani M A,Toghraie D.Experimental investigation for developing a new model for the thermal conductivity of silica/water-ethylene glycol(40%-60%)nanofluid at different temperatures and solid volume fractions[J].Journal of Molecular Liquids,2017,232:105-112.
[7]张东晖,施明恒.分形多孔介质中的热传导[J].工程热物理学报,2004,25(1):112-114.ZHANG Donghui,SHI Mingheng.Heat conduction in fractal porous media[J].Journal of Engineering Thermophysics,2004,25(1):112-114.
[8]刘晓燕,郑春媛,黄彩凤.多孔材料导热系数影响因素分析[J].低温建筑技术,2009,31(9):121-122.LIU Xiaoyan,ZHENG Chunyuan,HUANG Caifeng.Analysis effect factor of thermal conductivity for porous materials[J].Low Temperature Architecture Technology,2009,31(9):121-122.
[9]姚晓莉,易思阳,范利武,等.不同孔隙率下含湿加气混凝土的有效导热系数[J].浙江大学学报(工学版),2015(6):1101-1107.YAO Xiaoli,YI Siyang,FAN Liwu,et al.Effective thermal conductivity of moist aerated concrete with different porosities[J].Journal of Zhejiang University(Engineering Science),2015(6):1101-1107.
[10]李小川,施明恒,张东辉.非均匀多孔介质有效热导率分析[J].工程热物理学报,2006,27(4):644-646.LI Xiaochuan,SHI Mingheng,ZHANG Donghui.Analysis of effective conductivity for non-uniform porous media[J].Journal of Engineering Thermophysics,2006,27(4):644-646.
[11]岳宁芳.松散煤体导热系数的分析[J].矿业安全与环保,2006,33(3):26-27.YUE Ningfang.Analysis of coefficient of heat conductivity of loose coal body[J].Mining Safety&Environmental Protection,2006,33(3):26-27.
[12]岳高伟,雷留鹏,王兆丰,等.高低温环境下松散煤导热系数研究[J].河南理工大学学报:自然科学版,2017,36(2):1-6.YUE Gaowei,LEI Liupeng,WANG Zhaofeng,et al.Thermal diffusivity research of loose coal under high/low temperature environment[J].Journal of Henan Polytechnic University(Natural Science),2017,36(2):1-6.
[13]庞旭明,周剑秋,杨晶歆,等.含孔隙及界面热阻的复合材料有效导热系数[J].中国有色金属学报,2016(8):1668-1674.PANG Xuming,ZHOU Jianqiu,YANG Jingxin,et al.Effective thermal conductivity of composite materials containing pore and interface thermal resistance[J].The Chinese Journal of Nonferrous Metals,2016(8):1668-1674.
[14]Babaei H,Mc Gaughey A J H,Wilmer C E.Effect of pore size and shape on the thermal conductivity of metal-organic frameworks[J].Chemical Science,2017,8(1):583-589.
[15]陈则韶,陈建新,谭洋,等.烟草导热系数与含水率,堆密度的综合关系[J].中国科学技术大学学报,2005,35(1):124-129.CHEN Zeshao,CHEN Jianxin,TAN Yang,et al.Thermal conductivity of tobacco[J].Journal of University of Science and Technology of China,2005,35(1):124-129.
[16]韩莹,闫亚明,刘朝贤,等.利用瞬态平面热源法检测烟丝热物性的方法[J].烟草科技,2009(9):11-14.HAN Ying,YAN Yaming,LIU Chaoxian,et al.Measuring thermal properties of cut tobacco with transient plane thermal source method[J].Tobacco Science&Technology,2009(9):11-14.
[17]丰正功,李艳宁.基于TPS法简化模型测量物质导热系数[J].纳米技术与精密工程,2017(4):323-327.FENG Zhenggong,LI Yanning.Thermal conductivity measurement based on simplified model of TPS method[J].Nanotechnology and Precision Engineering,2017(4):323-327.
[18]马亚萍,刘朝贤,王乐,等.不同温度条件下烟丝—发烟剂体系热物性研究[J].食品与机械,2017(9):69-73.MA Yaping,LIU Chaoxian,WANG Le,et al.Study on thermophysical properties of tobacco and smoke agent under different temperature[J].Food&Machinery,2017(9):69-73.
[19]韩莹.利用瞬态平面热源法测量烟丝三种热物性研究[D].郑州:中国烟草总公司郑州烟草研究院,2009.HAN Ying.Measuring three thermal properties of cut tobacco with transient plane source method[D].Zhengzhou:Zhengzhou Tobacco Research Institute of CNTC,2009.
[20]陈敏恒,丛德滋,方图南.化工原理[M].3版.北京:化学工业出版社,2006.CHEN Minheng,CONG Dezi,FANG Tunan.Unit operations of chemical engineering[M].3rd ed.Beijing:Chemical Industry Press,2006.