Asymptotic Behavior of Mass Transfer for Solute Transport Through Stratified Porous Medium

Asymptotic Behavior of Mass Transfer for Solute Transport Through Stratified Porous Medium This study proposed an asymptotic relation to estimate the first-order mass transfer in multiprocess non-equilibrium model (MPNE) for solute transport through stratified porous media. The applicability of the proposed relation was tested with concentration data of reactive and non-reactive solutes through stratified porous media under the different hydraulic gradients. Semi-analytical solution of MPNE transport equation incorporating scale-dependent dispersivity was employed for simulating experimental breakthrough curves. MPNE transport model with scale-dependent dispersivity and constant mass transfer coefficient underestimated the solute mass at observation points. MPNE with constant and asymptotic mass transfer coefficient was then compared, and it was found that experimental breakthrough curves with the proposed relation were better simulated. The study concluded that averaging the mass transfer coefficient over higher scale and applied to a lower scale of observation, or vice-versa, will attribute to the scale dependent behavior. The skewed shape of breakthrough curve was also discussed in details, and it was found that immobile liquid phase was contributing to the prolonged tail concentration. This study further enhances the simulation and prediction capabilities of MPNE for large stratified aquifers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Transport in Porous Media Springer Journals

Asymptotic Behavior of Mass Transfer for Solute Transport Through Stratified Porous Medium

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer Science+Business Media B.V., part of Springer Nature
Subject
Earth Sciences; Geotechnical Engineering & Applied Earth Sciences; Industrial Chemistry/Chemical Engineering; Hydrology/Water Resources; Civil Engineering; Hydrogeology; Classical and Continuum Physics
ISSN
0169-3913
eISSN
1573-1634
D.O.I.
10.1007/s11242-018-1090-6
Publisher site
See Article on Publisher Site

Abstract

This study proposed an asymptotic relation to estimate the first-order mass transfer in multiprocess non-equilibrium model (MPNE) for solute transport through stratified porous media. The applicability of the proposed relation was tested with concentration data of reactive and non-reactive solutes through stratified porous media under the different hydraulic gradients. Semi-analytical solution of MPNE transport equation incorporating scale-dependent dispersivity was employed for simulating experimental breakthrough curves. MPNE transport model with scale-dependent dispersivity and constant mass transfer coefficient underestimated the solute mass at observation points. MPNE with constant and asymptotic mass transfer coefficient was then compared, and it was found that experimental breakthrough curves with the proposed relation were better simulated. The study concluded that averaging the mass transfer coefficient over higher scale and applied to a lower scale of observation, or vice-versa, will attribute to the scale dependent behavior. The skewed shape of breakthrough curve was also discussed in details, and it was found that immobile liquid phase was contributing to the prolonged tail concentration. This study further enhances the simulation and prediction capabilities of MPNE for large stratified aquifers.

Journal

Transport in Porous MediaSpringer Journals

Published: May 31, 2018

References

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