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| Titel |
A modified Lattice Boltzmann model for pore-scale simulation of desorption process at surface water-groundwater interface |
| VerfasserIn |
Pei Zhang, Sergio Galindo Torres, Hongwu Tang, Alexander Scheuermann, Guangqiu Jin, Ling Li |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149222
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| Publikation (Nr.) |
 EGU/EGU2017-13555.pdf |
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| Zusammenfassung |
| A pore-scale numerical model is introduced to simulate the desorption process at surface
water-groundwater interface. The Navier-Stokes equations for fluid and Advection-Diffusion
equation for scalar transport are solved by Lattice Boltzmann Method (LBM). In previous
studies, the macroscopic desorption kinetic equations are usually applied as a boundary
condition. However, it may be problematic for pore-scale simulation since most
desorption kinetic equations are fitted from macroscopic global variables. We avoid
this problem by discretizing the particle surface into a large number of adsorption
sites to mimic the microscopic desorption process. The state of each adsorption
site follows the Langmuir’s theory. Furthermore, benefiting from the mesoscopic
inherent of the LBM, the total number of adsorbate which really contacted with the
particle surface can be calculated rather than the local concentration. The predicted
desorption Isotherm and concentration profile match well with theoretical solutions and
experimental data. By using presented model, we find that the desorption process at
surface water-groundwater interface shows a complex response to surface water flow. |
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