The air flow and heat transfer in gravel embankment in permafrost areas
文献类型：期刊论文
| 作者 | Jiang, F; Liu, S; Wang, HG; Chen, HZ |
| 刊名 | SCIENCE IN CHINA SERIES D-EARTH SCIENCES
 |
| 出版日期 | 2004-08-01 |
| 卷号 | 47页码:142-151 |
| 关键词 | permafrost gravel embankment numerical computation gravels model porous media model |
| 英文摘要 | A comparative numerical investigation of transient temperature profile and pore-air velocities in horizontal rock block embankments are conducted using the "gravels model", in which the embankment is composed of stones and air, and the "porous media model" respectively. As the velocities from the "gravels model" directly reflect the true flow of air and winter-time convection, in this paper it can be concluded that computational results from the "gravels model" are superior to the "porous media model". In addition, the "gravels model" has the advantages of reflecting the effect of the dimensions and collocation of gravels upon the temperature fields. Therefore, the computation of the gravels embankment is mainly based on the gravels model. Simulation results show that in summer, a clockwise circulation of the pore-air extends throughout most of the embankment. However its motion is very weak that results in relatively straight horizontal isotherm lines. And heat transfer is mainly maintained through conduction. But in winter, the pore-air velocities are higher and multiple vortexes are formed in the embankment. Natural convection then becomes the dominant influence on the isotherm shapes within the embankment. The isotherms are complex and alternative upward and downward flowing plumes exist. The winter-time convection can further reduce the temperature of the foundation soil beneath the gravel embankment. In addition, the effects of the gravel dimensions within the embankment have been analyzed and compared in the gravels model. It shows that in winter, large stones, e.g. 200 mm, lead to stronger vortexes than those of small stones, say 60 mm. Consequently, the zone of low-temperature beneath the large-stone embankment extends deeper into the ground. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Geosciences, Multidisciplinary |
| 研究领域[WOS] | Geology |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000224381400016 |
| 公开日期 | 2015-12-22 |
| 源URL | [http://ir.etp.ac.cn/handle/311046/106197]  |
| 专题 | 工程热物理研究所_中国科学院工程热物理所（论文库）_期刊论文（SCI） |
| 作者单位 | Chinese Acad Sci, Inst Engn Thermophys, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jiang, F,Liu, S,Wang, HG,et al. The air flow and heat transfer in gravel embankment in permafrost areas[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2004,47:142-151. |
| APA | Jiang, F,Liu, S,Wang, HG,&Chen, HZ.(2004).The air flow and heat transfer in gravel embankment in permafrost areas.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,47,142-151. |
| MLA | Jiang, F,et al."The air flow and heat transfer in gravel embankment in permafrost areas".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 47(2004):142-151. |
入库方式： OAI收割
来源：工程热物理研究所
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