DOI: 10.1002/2015GL064513
论文题名: Pore-scale mechanisms for the enhancement of mixing in unsaturated porous media and implications for chemical reactions
作者: Jiménez-Martínez J. ; Anna P.D. ; Tabuteau H. ; Turuban R. ; Borgne T.L. ; Méheust Y.
刊名: Geophysical Research Letters
ISSN: 0094-9321
EISSN: 1944-9052
出版年: 2015
卷: 42, 期: 13 起始页码: 5316
结束页码: 5324
语种: 英语
英文关键词: chemical reactions
; mixing
; unsaturated porous media
Scopus关键词: Chemical reactions
; Gas oils
; Groundwater
; Ionization of gases
; Mixing
; Petroleum reservoir engineering
; Petroleum reservoirs
; Wetting
; Concentration fields
; Concentration gradients
; Non-wetting phasis
; Partially saturated porous media
; Saturated conditions
; Scalar dissipation rate
; Unsaturated flows
; Unsaturated porous media
; Porous materials
; chemical reaction
; dissipation
; mixing
; porous medium
; solute
; spatial distribution
; two-dimensional modeling
; unsaturated flow
; vadose zone
; wetting
英文摘要: Porous media in which different fluid phases coexist are common in nature (e.g., vadose zone and gas-oil reservoirs). In partially saturated porous media, the intricate spatial distributions of the wetting and nonwetting phases causes their flow to be focused onto preferential paths. Using a novel 2-D experimental setup allowing pore-scale measurement of concentration fields in a controlled unsaturated flow, we highlight mechanisms by which mixing of an invading fluid with the resident fluid is significantly enhanced when decreasing saturation. The mean scalar dissipation rate is observed to decrease slowly in time, while under saturated conditions it decays rapidly. This slow decrease is due to sustained longitudinal solute fingering, which causes concentration gradients to remain predominantly transverse to the average flow. Consequently, the effective reactivity is found to be much larger than under saturated conditions. These results provide new insights into the role that multiphase flows play on mixing/reaction in porous media. Key Points Enhancement of solutes mixing in unsaturated porous media Mixing-induced reactivity in unsaturated porous media Vadose zone and gas-oil reservoir. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938151182&doi=10.1002%2f2015GL064513&partnerID=40&md5=e3bebb0cf8167d54254bd997b515cd37
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8936
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Geosciences Rennes, UMR 6118, CNRS, Université de Rennes 1, Rennes, France
Recommended Citation:
Jiménez-Martínez J.,Anna P.D.,Tabuteau H.,et al. Pore-scale mechanisms for the enhancement of mixing in unsaturated porous media and implications for chemical reactions[J]. Geophysical Research Letters,2015-01-01,42(13).