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DOI | 10.1002/2017GL074651 |
Effect of deformation on the thermal conductivity of granular porous media with rough grain surface | |
Askari, Roohollah1; Hejazi, S. Hossein2; Sahimi, Muhammad3 | |
2017-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:16 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada |
英文摘要 | Heat transfer in granular porous media is an important phenomenon that is relevant to a wide variety of problems, including geothermal reservoirs and enhanced oil recovery by thermal methods. Resistance to flow of heat in the contact area between the grains strongly influences the effective thermal conductivity of such porous media. Extensive experiments have indicated that the roughness of the grains' surface follows self-affine fractal stochastic functions, and thus, the contact resistance cannot be accounted for by models based on smooth surfaces. Despite the significance of rough contact area, the resistance has been accounted for by a fitting parameter in the models of heat transfer. In this Letter we report on a study of conduction in a packing of particles that contains a fluid of a given conductivity, with each grain having a rough self-affine surface, and is under an external compressive pressure. The deformation of the contact area depends on the fractal dimension that characterizes the grains' rough surface, as well as their Young's modulus. Excellent qualitative agreement is obtained with experimental data. Deformation of granular porous media with grains that have rough self-affine fractal surface is simulated. Thermal contact resistance between grains with rough surfaces is incorporated into the numerical simulation of heat conduction under compressive pressure. By increasing compressive pressure, thermal conductivity is enhanced more in the grains with smoother surfaces and lower Young's modulus. Excellent qualitative agreement is obtained with the experimental data. |
英文关键词 | thermal conductivity roughness pore scale fractal geometry Weierstrass-Mandelbrot model thermal contact resistance |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000410658800024 |
WOS关键词 | CONTACT CONDUCTANCE ; HEAT-CONDUCTION ; MODEL ; SIMULATION ; RESISTANCE ; BEDS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/27412 |
专题 | 气候变化 |
作者单位 | 1.Michigan Technol Univ, Dept Geol & Min Engn & Sci, Houghton, MI 49931 USA; 2.Univ Calgary, Dept Chem & Petr Engn, Calgary, AB, Canada; 3.Univ Southern Calif, Mork Family Dept Chem Engn & Mat Sci, Los Angeles, CA USA |
推荐引用方式 GB/T 7714 | Askari, Roohollah,Hejazi, S. Hossein,Sahimi, Muhammad. Effect of deformation on the thermal conductivity of granular porous media with rough grain surface[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(16). |
APA | Askari, Roohollah,Hejazi, S. Hossein,&Sahimi, Muhammad.(2017).Effect of deformation on the thermal conductivity of granular porous media with rough grain surface.GEOPHYSICAL RESEARCH LETTERS,44(16). |
MLA | Askari, Roohollah,et al."Effect of deformation on the thermal conductivity of granular porous media with rough grain surface".GEOPHYSICAL RESEARCH LETTERS 44.16(2017). |
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