气候变化领域集成服务门户(CCPortal): Experimental study on ventilation characteristics of a concrete-sphere layer and a crushed-rock layer

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DOI	10.1016/j.ijheatmasstransfer.2012.12.013
	Experimental study on ventilation characteristics of a concrete-sphere layer and a crushed-rock layer
	Zhang, Mingyi; Lai, Yuanming; Li, Dongqing; Chen, Wu; Tong, Gangqiang
发表日期	2013
ISSN	0017-9310
起始页码	407
结束页码	413
卷号	59
英文摘要	A crushed-rock layer has been utilized to thermally stabilize the railway/highway embankments in permafrost regions as this porous layer performs an air convective cooling effect, which is primarily determined by the internal ventilation drag. To maximize the cooling effect, this study used wind tunnel experiments to test the ventilation characteristics and ventilation-drag parameters of the two porous media, i.e. a concrete-sphere layer and a crushed-rock layer, with different particle sizes. The experimental results indicate that significantly quadric relationships exist between the pressure gradient and the superficial velocity in both the concrete-sphere layer and crushed-rock layer with large particle sizes. The nonlinearity can be divided into a viscous loss term and an inertial loss term. It is also found that for the two media, their permeabilities and inertial resistance factors are significantly related to the mean particle sizes of the media. The crushed-rock layer is found to have a larger ventilation drag than the concrete-sphere layer under the same mean particle size because the crushed rocks have irregular shapes and coarse surfaces. These findings are helpful to numerically apply the heat and mass transfer theories in porous media to model the cooling effect of the crushed-rock embankments in permafrost regions. (C) 2012 Elsevier Ltd. All rights reserved.
英文关键词	Ventilation characteristic; Concrete-sphere layer; Crushed-rock layer; Porous media; Permafrost region
语种	英语
WOS研究方向	Thermodynamics ; Engineering ; Mechanics
WOS类目	Thermodynamics ; Engineering, Mechanical ; Mechanics
WOS关键词	PERMAFROST REGIONS ; POROUS-MEDIA ; BOUNDARY-CONDITIONS ; FORCED-CONVECTION ; TIBET RAILWAY ; EMBANKMENTS ; HIGHWAY ; PLATEAU
WOS记录号	WOS:000316306700041
来源期刊	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239508
作者单位	[Zhang, Mingyi; Lai, Yuanming; Li, Dongqing; Chen, Wu; Tong, Gangqiang] Chinese Acad Sci, State Key Lab Frozen Soil Engn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Mingyi,Lai, Yuanming,Li, Dongqing,et al. Experimental study on ventilation characteristics of a concrete-sphere layer and a crushed-rock layer[J],2013,59.
APA	Zhang, Mingyi,Lai, Yuanming,Li, Dongqing,Chen, Wu,&Tong, Gangqiang.(2013).Experimental study on ventilation characteristics of a concrete-sphere layer and a crushed-rock layer.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,59.
MLA	Zhang, Mingyi,et al."Experimental study on ventilation characteristics of a concrete-sphere layer and a crushed-rock layer".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 59(2013).