Measurement and modeling of the effective thermal conductivity for porous methane hydrate samples  

作　　者：LI DongLiang DU Jian HE Song LIANG WeiDeQing ZHAO XiangYong YANG XiangYang 

机构地区：[1]Key Laboratory of Renewable Energy and Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China [2]Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China [3]Graduate School of the Chinese Academy of Sciences, Beijing 100039. China

出　　处：《Science China Chemistry》2012年第3期373-379,共7页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program of China (2009CB219504);the National Natural Science Foundation of China (50706056,U0933004);Guangdong Province Science and Technology Program (2009B030600005)

摘　　要：The effective thermal conductivities of gas-saturated porous methane hydrates were measured by a single-sided transient plane source (TPS) technique and simulated by a generalized fractal model of porous media that based on self-similarity.The density of porous hydrate,measured by the volume of the sample in the experimental system,was used to evaluate the porosity of methane hydrate samples.The fractal model was based on Sierpinski carpet,a thermal-electrical analogy technique and one-dimensional heat flow assumption.Both the experimental and computational results show the effective thermal conductivity of methane hydrate decreases with the porosity increase.The porosity of 0.3 can reduce the thermal conductivity of the methane hydrate by 25%.By analysis of the experimental data and the simulative result,the optimized thermal conductivity of the zero-porosity methane hydrate is about 0.7 W m-1K-1.The effective thermal conductivities of gas-saturated porous methane hydrates were measured by a single-sided transient plane source （TPS） technique and simulated by a generalized fractal model of porous media that based on self-similarity, The density of porous hydrate, measured by the volume of the sample in the experimental system, was used to evaluate the porosity of me- thane hydrate samples, The fractal model was based on Sierpinski carpet, a thermal-electrical analogy technique and one-dimensional heat flow assumption. Both the experimental and computational results show the effective thermal conductiv- ity of methane hydrate decreases with the porosity increase. The porosity of 0.3 can reduce the thermal conductivity of the methane hydrate by 25%. By analysis of the experimental data and the simulative result, the optimized thermal conductivity of the zero-porosity methane hydrate is about 0.7 W m^-1 K^-1.

关 键 词：gas hydrate thermal conductivity fractal geometry model POROSITY 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TK124[自动化与计算机技术—计算机科学与技术]