Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 550696
Title Pressure development in charged porous media with heterogeneous pore sizes
Author(s) Cornelissen, P.; Leijnse, A.; Joekar-Niasar, V.; Zee, S.E.A.T.M. van der
Source Advances in Water Resources 128 (2019). - ISSN 0309-1708 - p. 193 - 205.
DOI https://doi.org/10.1016/j.advwatres.2019.05.001
Department(s) Plant Ecology and Nature Conservation
Soil Physics and Land Management
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Charged porous media - Disjoining pressure - Heterogeneity - Osmosis - Salinity
Abstract

Upscaling the microscopic processes in charged porous media which are responsible for pore pressure evolution and swelling is a topic of ongoing research. Current theories assume homogeneous media with uniform pore sizes and the impact of microscopic heterogeneity is neglected. This is a preliminary study to determine the significance of such pore-scale heterogeneity on the pressure evolution in charged porous media, where we neglect deformation of the solid phase. We present a pore-network model to simulate salt transport and pressure evolution in a charged porous medium. Results show that, for pore radii following a log-normal distribution, the average pressure in heterogeneous networks are significantly lower than in homogeneous networks with the same mean pore size. This is expressed by lower average pressures, as well as lower streaming potentials and faster ion transport rates in heterogeneous networks. These results indicate that heterogeneity in charged porous media should be investigated further.

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