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| Titel |
The Impact of Fluid Deformation on Mixing and Fast Chemical Reaction Along Reaction Fronts in Porous Media |
| VerfasserIn |
Marco Dentz, Tanguy Le Borgne, Timothy Ginn, Mohamed Nassar, Lynn S. Bennethum |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250107100
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| Publikation (Nr.) |
 EGU/EGU2015-6792.pdf |
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| Zusammenfassung |
| Fast chemical reactions in heterogeneous flows are controlled by fluid mixing, which perturbs
local chemical equilibria and thus triggers chemical reactions. The deformation of material
fluid elements in inhomogeneous flow fields leads to solute spreading and increased mixing
due to the steepening of concentration gradients on one hand, and the increase of
interfacial surface area between chemicals on the other. We present an approach
based on a lamellar representation of fluid mixing that links fluid deformation,
the distribution of concentration gradiens, and the upscaled reaction rates for fast
reversible reactions. The evolution of effective reaction rates are governed by the flow
topology, which determines the distribution of local velocity gradients, and the
elongation rate of the reaction front. This leads to a significant increase of reaction
efficiency, which turns out to be orders of magnitude larger than in homogeneous flow.
This lamella based approach allows for the systematic evaluation of the temporal
evolution of equilibrium reaction rates in inhomogeneous flows, and establishes a
direct link between the reaction efficiency and the spatial characteristics of the
underlying flow field as quantified by the deformation of material fluid elements. |
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