气候变化领域集成服务门户(CCPortal): Experimental investigation on macroscopic behavior and microfluidic field of nonlinear flow in rough-walled artificial fracture models

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DOI	10.1016/j.advwatres.2020.103637
	Experimental investigation on macroscopic behavior and microfluidic field of nonlinear flow in rough-walled artificial fracture models
	Guo P.; Wang M.; He M.; Wang Y.; Gao K.; Gong W.
发表日期	2020
ISSN	0309-1708
卷号	142
英文摘要	The understanding of nonlinear flow in rough-walled rock fractures is critical for underground engineering and geological sciences. The macroscopic behavior and microfluidic field of flow in rough-walled artificial fracture models was investigated through microscopic visualization of hydraulic experiment. The results indicate that there are three states of flow regime in fracture, namely linear, weak inertial and strong inertial. In linear flow regime, the relationship between pressure drops and flow rate is linear, and all the streamlines in the microfluidic field are parallel. In weak inertial flow regime, pressure drop and flow become nonlinear, and the inertial pressure loss is less than the viscous pressure loss. Moreover, backflow occurs near the tortuous wall in the microfluidic field. In strong inertial flow regime, the inertial pressure loss is greater than viscous pressure loss, and the backflow begins to detach from the wall and eventually develop into a significantly large eddy far away from the wall. However, the flow in the mainstream remains laminar rather than turbulent in this experiment. This result indicates that the main cause of the nonlinearity of flow in fracture is eddies due to the increase of the inertia term and the variation of aperture. The shrinking of effective channel and losing of kinetic energy caused by eddies make fluid flow nonlinear. Moreover, the area and number of eddies depend on the fracture roughness and the Reynolds number. © 2020
关键词	Drops Fracture Kinetic energy Kinetics Microfluidics Pressure drop Reynolds number Artificial fracture Experimental investigations Fracture roughness Geological science Macroscopic behaviors Microscopic visualization Nonlinearity of flow Underground engineering Flow of fluids experimental study flow field fracture laminar flow pressure drop Reynolds number wall rock
语种	英语
来源机构	Advances in Water Resources
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131777
推荐引用方式 GB/T 7714	Guo P.,Wang M.,He M.,et al. Experimental investigation on macroscopic behavior and microfluidic field of nonlinear flow in rough-walled artificial fracture models[J]. Advances in Water Resources,2020,142.
APA	Guo P.,Wang M.,He M.,Wang Y.,Gao K.,&Gong W..(2020).Experimental investigation on macroscopic behavior and microfluidic field of nonlinear flow in rough-walled artificial fracture models.,142.
MLA	Guo P.,et al."Experimental investigation on macroscopic behavior and microfluidic field of nonlinear flow in rough-walled artificial fracture models".142(2020).