张赛,陈君若,刘美红,刘显茜.不完全分形多孔介质热导率模型[J].农业机械学报,2014,45(8):220-224.
Zhang Sai,Chen Junruo,Liu Meihong,Liu Xianxi.Thermal Conductivity Model of Incomplete Fractal Porous Media[J].Transactions of the Chinese Society for Agricultural Machinery,2014,45(8):220-224.
摘要点击次数: 3524
全文下载次数: 1338
不完全分形多孔介质热导率模型   [下载全文]
Thermal Conductivity Model of Incomplete Fractal Porous Media   [Download Pdf][in English]
投稿时间:2013-11-21  
DOI:10.6041/j.issn.1000-1298.2014.08.035
中文关键词:  不完全分形  有效热导率  多孔介质
基金项目:国家自然科学基金资助项目(51165014)、云南省教育厅重大专项资助项目(ZD2010002)、云南省科技计划项目资助项目(2012FB130)和云南省教育厅科学研究基金资助项目(2012Y540)
作者单位
张赛 昆明理工大学 
陈君若 昆明理工大学 
刘美红 昆明理工大学 
刘显茜 昆明理工大学 
中文摘要:将多孔介质的物理构成分为具有分形结构的团聚体集合和不具有分形特性的固相和孔隙相,建立了简化单元体模型解释其微观结构。结合多孔介质在干燥过程中热量守恒定律和傅里叶导热定律导出了材料总有效热导率模型。此模型无经验常数,每一个参数都有物理意义。研究结果表明,有效热导率与迂曲分形维数、面积分形维数、孔隙率和热风温度呈反比,与热风速率和时间呈正比。
Zhang Sai  Chen Junruo  Liu Meihong  Liu Xianxi
Kunming University of Science and Technology;Kunming University of Science and Technology;Kunming University of Science and Technology;Kunming University of Science and Technology
Key Words:Incomplete fractal  Effective thermal conductivity  Porous media
Abstract:The porous media was divided into the fractal aggregation and the non fractal solid phase and pore phase, and a simplified cell model was made to show the microstructure. Porosity, areal fractal dimension, tortuosity fractal dimension, tortuosity, solid phase area and pore phase area of incomplete fractal porous were exhibited. The effective thermal conductivity was built combined with thermal energy and Fouriers law of heat conduction during drying, thermal energy including the heat which required for solid phase during the drying and the heat coming from the circulating hot air. The model was not based on empirical formulas and assumed thermal resistance, and each symbol had definite physical meaning. The result showed that effective thermal conductivity had a negative correlation with the tortuosity fractal dimension, porosity, areal fractal dimension and hot air temperature, while it has a positive correlation with the hot air rate and time.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

   下载PDF阅读器