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

• Published in: Science China. Chemistry 2012-03, Vol.55 (3), p.373-379
• Main Authors: Li, DongLiang, Du, JianWei, He, Song, Liang, DeQing, Zhao, XiangYong, Yang, XiangYang
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Fractal models; Heat transfer; Heat transmission; Methane hydrates; Porosity; Porous media; Self-similarity; Sierpinski地毯; Thermal conductivity; Transient plane source technique; 多孔介质; 密度测量; 建模; 有效导热系数; 样品; 甲烷水合物; 电模拟技术
• ISSN: 1674-7291; 1869-1870
• DOI: 10.1007/s11426-011-4459-8

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.