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| Titel |
Network models of dissolution and precipitation of porous media |
| VerfasserIn |
A. Budek, P. Szymczak |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064124
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| Zusammenfassung |
| Chemical erosion of a porous medium is a complex process, involving
the interplay between flow, transport, reaction and geometry
evolution. The nonlinear couplings between these processes may lead to
the formation of intricate dissolution patterns, the characteristics
of which depend strongly on the fluid flow and mineral dissolution
rates. In particular, in a broad range of physical conditions, long,
finger-like channels or ``wormholes'' are spontaneously formed, where
the majority of the flow is focused. To study this process, we model
the porous medium as a system of interconnected pipes with the
diameter of each segment increasing in proportion to the local
reactant consumption. Moreover, the topology of the network is allowed
to change dynamically during the simulation: as the diameters of the
eroding pores become comparable with the interpore distances, the
pores are joined together thus changing the interconnections within
the network. With this model, we investigate different growth regimes
in an evolving porous medium, allowing for both erosion and
precipitation of the dissolved material. |
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