DOI: 10.1002/2014GL060068
论文题名: The filamentary structure of mixing fronts and its control on reaction kinetics in porous media flows
作者: De Anna P. ; Dentz M. ; Tartakovsky A. ; Le Borgne T.
刊名: Geophysical Research Letters
ISSN: 0094-10019
EISSN: 1944-9750
出版年: 2014
卷: 41, 期: 13 起始页码: 4586
结束页码: 4593
语种: 英语
英文关键词: kinetics scaling
; mixing
; porous media
; reactive transport
Scopus关键词: Association reactions
; Batch reactors
; Deformation
; Diffusion in liquids
; Dispersions
; Kinetics
; Mixing
; Porous materials
; Collective behavior
; Concentration gradients
; Elementary process
; Filament-like structures
; Filamentary structures
; Heterogeneous flow
; Orders of magnitude
; Reactive transport
; Reaction kinetics
英文摘要: The mixing dynamics resulting from the combined action of diffusion, dispersion, and advective stretching of a reaction front in heterogeneous flows leads to reaction kinetics that can differ by orders of magnitude from those measured in well-mixed batch reactors. The reactive fluid invading a porous medium develops a filamentary or lamellar front structure. Fluid deformation leads to an increase of the front length by stretching and consequently a decrease of its width by compression. This advective front deformation, which sharpens concentration gradients across the interface, is in competition with diffusion, which tends to increase the interface width and thus smooth concentration gradients. The lamella scale dynamics eventually develop into a collective behavior through diffusive coalescence, which leads to a disperse interface whose width is controlled by advective dispersion. We derive a new approach that quantifies the impact of these filament scale processes on the global mixing and reaction kinetics. The proposed reactive filament model, based on the elementary processes of stretching, coalescence, and fluid particle dispersion, provides a new framework for predicting reaction front kinetics in heterogeneous flows. Key Points We propose a new model based on stretching, coalescence, and dispersion The coalescence of filament-like structures impact the global reaction kinetics Our model provides a framework for predicting heterogeneous front kinetics ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84903807365&doi=10.1002%2f2014GL060068&partnerID=40&md5=d73f38f0ad8070a89ace789277328bcd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7283
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge MA, United States
Recommended Citation:
De Anna P.,Dentz M.,Tartakovsky A.,et al. The filamentary structure of mixing fronts and its control on reaction kinetics in porous media flows[J]. Geophysical Research Letters,2014-01-01,41(13).