Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020895 |
Experimental Investigation of Hysteretic Dynamic Capillarity Effect in Unsaturated Flow | |
Zhuang, Luwen1; Hassanizadeh, S. Majid1,2; Qin, Chao-Zhong3; de Waal, Arjen1 | |
2017-11-01 | |
发表期刊 | WATER RESOURCES RESEARCH
![]() |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | Netherlands |
英文摘要 | The difference between average pressures of two immiscible fluids is commonly assumed to be the same as macroscopic capillary pressure, which is considered to be a function of saturation only. However, under transient conditions, a dependence of this pressure difference on the time rate of saturation change has been observed by many researchers. This is commonly referred to as dynamic capillarity effect. As a first-order approximation, the dynamic term is assumed to be linearly dependent on the time rate of change of saturation, through a material coefficient denoted by . In this study, a series of laboratory experiments were carried out to quantify the dynamic capillarity effect in an unsaturated sandy soil. Primary, main, and scanning drainage experiments, under both static and dynamic conditions, were performed on a sandy soil in a small cell. The value of the dynamic capillarity coefficient was calculated from the air-water pressure differences and average saturation values during static and dynamic drainage experiments. We found a dependence of on saturation, which showed a similar trend for all drainage conditions. However, at any given saturation, the value of for primary drainage was larger than the value for main drainage and that was in turn larger than the value for scanning drainage. Each data set was fit a simple log-linear equation, with different values of fitting parameters. This nonuniqueness of the relationship between and saturation and possible causes is discussed. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000418736700023 |
WOS关键词 | PRESSURE-SATURATION RELATIONSHIP ; 2-PHASE FLOW ; HYDRAULIC CONDUCTIVITY ; TRANSIENT CONDITIONS ; INTERFACIAL AREA ; STEADY-STATE ; WATER ; UNIQUENESS ; DRAINAGE ; LAYER |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
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/20093 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Utrecht, Dept Earth Sci, Utrecht, Netherlands; 2.Deltares, Soil & Groundwater Syst, Utrecht, Netherlands; 3.Eindhoven Univ Technol, Dept Mech Engn, Eindhoven, Netherlands |
推荐引用方式 GB/T 7714 | Zhuang, Luwen,Hassanizadeh, S. Majid,Qin, Chao-Zhong,et al. Experimental Investigation of Hysteretic Dynamic Capillarity Effect in Unsaturated Flow[J]. WATER RESOURCES RESEARCH,2017,53(11). |
APA | Zhuang, Luwen,Hassanizadeh, S. Majid,Qin, Chao-Zhong,&de Waal, Arjen.(2017).Experimental Investigation of Hysteretic Dynamic Capillarity Effect in Unsaturated Flow.WATER RESOURCES RESEARCH,53(11). |
MLA | Zhuang, Luwen,et al."Experimental Investigation of Hysteretic Dynamic Capillarity Effect in Unsaturated Flow".WATER RESOURCES RESEARCH 53.11(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论