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DOI	10.1080/08916150600616535
	Laboratory investigation of the heat transfer characteristics of a trapezoidal crushed-rock layer under impermeable and permeable boundaries
	Zhang, Mingyi; Lai, Yuanming; Yu, Wenbing; Qi, Jilin
发表日期	2006
ISSN	0891-6152
起始页码	251
结束页码	264
卷号	19 期号:4
英文摘要	Crushed-rock layer can be taken as a highly porous medium, which is often used in highway/ railway embankment of permafrost regions. In this study, in order to investigate the characteristics of heat transfer of a trapezoidal crushed-rock layer, laboratory tests were carried out on the porous material with impermeable and permeable boundaries under wind condition. Case 1 was closed crushed-rock layer and Case 2 was open crushed-rock layer. The results for the two cases were analyzed and compared with each other. It can be concluded that the heat transfer rate of Case 2 is higher than that of Case 1, but long-term cooling capability of Case 1 is larger than that of Case 2 under the same experimental conditions. Furthermore, we found that the heat transfer mechanisms of the two cases are quite different from each other, namely, the energy exchange of the Case 1 mainly relies on the internal natural convection which is caused by thermal variations, while in Case 2 it is from the heat transfer enhancement because of the internal forced convection induced by the external air flow. Therefore, the boundary conditions (impermeable and permeable) of crushed-rock layer can have a very large impact on the heat transfer pattern, especially under windy condition.
英文关键词	trapezoidal crushed-rock layer; porous medium; heat transfer characteristics; impermeable and permeable boundaries
语种	英语
WOS研究方向	Thermodynamics ; Engineering
WOS类目	Thermodynamics ; Engineering, Mechanical
WOS关键词	NATURAL-CONVECTION ; POROUS-MEDIUM ; PERMAFROST REGIONS ; RAILWAY EMBANKMENT ; COLD REGIONS ; MEDIA
WOS记录号	WOS:000240435800001
来源期刊	EXPERIMENTAL HEAT TRANSFER
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239546
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Mingyi,Lai, Yuanming,Yu, Wenbing,et al. Laboratory investigation of the heat transfer characteristics of a trapezoidal crushed-rock layer under impermeable and permeable boundaries[J],2006,19(4).
APA	Zhang, Mingyi,Lai, Yuanming,Yu, Wenbing,&Qi, Jilin.(2006).Laboratory investigation of the heat transfer characteristics of a trapezoidal crushed-rock layer under impermeable and permeable boundaries.EXPERIMENTAL HEAT TRANSFER,19(4).
MLA	Zhang, Mingyi,et al."Laboratory investigation of the heat transfer characteristics of a trapezoidal crushed-rock layer under impermeable and permeable boundaries".EXPERIMENTAL HEAT TRANSFER 19.4(2006).