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	Experimental investigation on influence of boundary conditions on cooling effect and mechanism of crushed-rock layers
	Lai, Yuanming; Ma, Weidong; Zhang, Mingyi; Yu, Wenbing; Gao, Zhihua
刊名	COLD REGIONS SCIENCE AND TECHNOLOGY
	2006-07-01
卷号	45期号:2页码:114-121
关键词	boundary condition cooling effect cooling mechanism crushed-rock mass
ISSN号	0165-232X
DOI	10.1016/j.coldregions.2006.03.003
通讯作者	Lai, Yuanming(ymlai@ns.lzb.ac.cn)
英文摘要	A series of experiments were carried out for the crushed-rock layers with open and closed boundaries, respectively. According to the measured temperature and calculated velocity distributions in the crushed-rock layers with the upper boundaries covered and exposed, it is found that, under the upper boundary covered, the heat transfer from the lower area to the upper area of the crushed-rock layer is by means of the natural convection and the thermal conduction among the crushed rocks when the temperature on the top surface of the crushed-rock layer is lower than that on the bottom surface. The heat transfer from the upper area to the lower area of the crushed-rock layer is mainly carried out by thermal conduction when the temperature on the top surface is higher than that on the bottom, and at that time the air in the crushed-rock layer almost kept static, which could obstruct the heat transfer. Therefore, the crushed-rock mass with closed boundaries can efficiently remove heat from its bottom surface during cold season and intakes a little heat during warm season. The net effect shows that it can be as a passive cooling method. Its characteristic is of thermal semiconductor. However, under the upper boundary exposed, when the wind of an average temperature 0.5 degrees C crosses over the top surface of the crushed-rock layer, the thermal transfer is mainly by the forced convection. Its characteristic is not of thermal semiconductor and its cooling effect is not obvious. (c) 2006 Elsevier B.V. All rights reserved.
收录类别	SCI
WOS关键词	POROUS-MEDIA ; PERMAFROST ; CLIMATE ; HEAT
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000238733300006
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2555838
专题	寒区旱区环境与工程研究所
通讯作者	Lai, Yuanming
作者单位	1.Chinese Acad Sci, State Key Lab Frozen Soil Engn Cold & Arid Reg, Lanzhou 730000, Peoples R China 2.Chinese Acad Sci, Environm & Engn Res Inst, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Lai, Yuanming,Ma, Weidong,Zhang, Mingyi,et al. Experimental investigation on influence of boundary conditions on cooling effect and mechanism of crushed-rock layers[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2006,45(2):114-121.
APA	Lai, Yuanming,Ma, Weidong,Zhang, Mingyi,Yu, Wenbing,&Gao, Zhihua.(2006).Experimental investigation on influence of boundary conditions on cooling effect and mechanism of crushed-rock layers.COLD REGIONS SCIENCE AND TECHNOLOGY,45(2),114-121.
MLA	Lai, Yuanming,et al."Experimental investigation on influence of boundary conditions on cooling effect and mechanism of crushed-rock layers".COLD REGIONS SCIENCE AND TECHNOLOGY 45.2(2006):114-121.

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