| A Novel Approach for the Effective Thermal Conductivity of Porous Ceramics |
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| 作者姓名： | ZHU Qianga ZHANG Fan-weia ZHANG Yuea * ZHANG Da-haib LI Zhong-pingb aSchool of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing China bNational Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials and Processing Technology Beijing China |
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| 作者单位： | ZHU Qianga，ZHANG Fan-weia，ZHANG Yuea，*，ZHANG Da-haib，LI Zhong-pingb aSchool of Materials Science and Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100083，China bNational Key Laboratory of Advanced Functional Composite Materials，Aerospace Research Institute of Materials and Processing Technology，Beijing 100076，China |
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| 摘 要： | A new approach in combination of the effective medium theory with the equivalent unit in numerical simulation was developed to study the effective thermal conductivity of porous ceramics. The finite element method was used to simulate the heat transfer process which enables to acquire accurate results through highly complicated modeling and intensive computation. An alternative approach to mesh the material into small cells was also presented. The effective medium theory accounts for the effective thermal conductivity of cells while the equivalent unit is subsequently applied in numerical simulation to analyze the effective thermal conductivity of the porous ceramics. A new expression for the effective thermal conductivity, allowing for some structure factors such as volume fraction of pores and thermal conductivity, was put forward, and the results of its application was proved to be close to those of the mathematical simula-tion.
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A Novel Approach for the Effective Thermal Conductivity of Porous Ceramics |
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| ZHU Qianga,ZHANG Fan-weia,ZHANG Yuea,*,ZHANG Da-haib,LI Zhong-pingb aSchool of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics,Beijing ,China bNational Key Laboratory of Advanced Functional Composite Materials,Aerospace Research Institute of Materials and Processing Technology,Beijing ,China.A Novel Approach for the Effective Thermal Conductivity of Porous Ceramics[J].Chinese Journal of Aeronautics,2006,19(Z1). |
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| Authors: | ZHU Qiang ZHANG Fan-wei ZHANG Yue ZHANG Da-hai LI Zhong-ping |
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| Abstract: | A new approach in combination of the effective medium theory with the equivalent unit in numerical simulation was developed to study the effective thermal conductivity of porous ceramics. The finite element method was used to simulate the heat transfer process which enables to acquire accurate results through highly complicated modeling and intensive computation. An alternative approach to mesh the material into small cells was also presented. The effective medium theory accounts for the effective thermal conductivity of cells while the equivalent unit is subsequently applied in numerical simulation to analyze the effective thermal conductivity of the porous ceramics. A new expression for the effective thermal conductivity, allowing for some structure factors such as volume fraction of pores and thermal conductivity, was put forward, and the results of its application was proved to be close to those of the mathematical simulation. |
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| Keywords: | effective thermal conductivity porous ceramics equivalent unit numerical simulation |
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