Research Project C05

Process-dependent porosity-permeability relations for fluid-solid reactions in porous media


Data sets published by project C05 can be found on the DaRUS website

Publications in scientific journals

  1. Yiotis, A., Karadimitriou, N. K., Zarikos, I., & Steeb, H. (2021). Pore-scale effects during the transition from capillary- to viscosity-dominated flow dynamics within microfluidic porous-like domains. Scientific Reports, 11(1), Article 1.
  2. Weinhardt, F., Class, H., Dastjerdi, S. V., Karadimitriou, N., Lee, D., & Steeb, H. (2021). Experimental Methods and Imaging for Enzymatically Induced Calcite Precipitation in a Microfluidic Cell. Water Resources Research, 57(3), Article 3.
  3. Poonoosamy, J., Haber-Pohlmeier, S., Deng, H., Deissmann, G., Klinkenberg, M., Gizatullin, B., Stapf, S., Brandt, F., Bosbach, D., & Pohlmeier, A. (2020). Combination of MRI and SEM to Assess Changes in the Chemical Properties and Permeability of Porous Media due to Barite Precipitation. Minerals, 10(3), 226.
  4. Ruf, M., & Steeb, H. (2020). An open, modular, and flexible micro X-ray computed tomography system for research. Review of Scientific Instruments, 91(11), 113102--.
  5. Piotrowski, J., Huisman, J. A., Nachshon, U., Pohlmeier, A., & Vereecken, H. (2020). Gas Permeability of Salt Crusts Formed by Evaporation from Porous Media. Geosciences, 10(11), Article 11.
  6. Konangi, S., Palakurthi, N. K., Karadimitriou, N. K., Comer, K., & Ghia, U. (2020). Comparison of Pore-scale Capillary Pressure to Macroscale Capillary Pressure using Direct Numerical Simulations of Drainage under Dynamic and Quasi-static Conditions. Advances in Water Resources, 103792.
  7. Hasan, S., Niasar, V., Karadimitriou, N. K., Godinho, J. R. A., Vo, N. T., An, S., Rabbani, A., & Steeb, H. (2020). Direct characterization of solute transport in unsaturated porous media using fast X-ray synchrotron microtomography. Proceedings of the National Academy of Sciences.
  8. Karadimitriou, N. K., Mahani, H., Steeb, H., & Niasar, V. (2019). Nonmonotonic Effects of Salinity on Wettability Alteration and Two-Phase Flow Dynamics in PDMS Micromodels. Water Resources Research.
  9. Steeb, H., & Renner, J. (2019). Mechanics of Poro-Elastic Media: A Review with Emphasis on Foundational State Variables. Transport in Porous Media.
  10. Hasan, S. N., Joekar-Niasar, V., Karadimitriou, N., & Sahimi, M. (2019). Saturation-Dependence of Non-Fickian Transport in Porous Media. Water Resources Research.
  11. Yin, X., Zarikos, I., Karadimitriou, N. K., Raoof, A., & Hassanizadeh, S. M. (2019). Direct simulations of two-phase flow experiments of different geometry complexities using Volume-of-Fluid (VOF) method. Chemical Engineering Science, 195, 820--827.


About this Project

Fluid-solid reactions pose a challenge for modelling flow and transport in porous media due to the dynamic changes in the pore space and the associated alteration of the permeability. This project aims to use Magnetic Resonance Imaging and X-ray computer microtomography (µXRCT) measurements in combination with flow and transport experiments on the REV scale to experimentally elucidate differences in the evolution of porosity and permeability for two different fluid-solid reactions: salt precipitation during evaporation and (microbially-) induced calcite precipitation.


Salt precipitation during evaporation

Salt precipitation due to evaporation from porous media leads to the formation of a salt crust that affects the flow and transport of water and solutes in the top layer of a porous media, and causes amongst others soil salinization, erosion and land loss, and damage to building materials. Despite extensive research on evaporation of saline solutions from porous media, little is known about the effective transport properties of the developing salt crusts besides their importance for accurate modeling of evaporation.

In this project, the permeability of salt crusts that form on top (efflorescence) or inside (subflorescence) of the porous medium from evaporation of saline solution was determined with a gas permeameter set-up. The developed experimental approach with custom-made sample holders enabled the investigation of separated consolidated salt crusts. Although efflorescent and subflorescent salt crusts developed differently, the gas permeability of the dried crusts were similar and within one order of magnitude. µXRCT scans of subflorescent MgSO4 crusts revealed the deformation of the porous medium by salt precipitation. This in conflict with the common assumption that sublorescent precipitation occurs within a rigid porous structure. Overall, the experimental insights obtained in this project help to understand the impact of precipitation on evaporation on the pore scale. Additionally, the information and the evolution of porosity and REV-scale permeability can be used to improve Darcy-scale models that describe the evaporation of saline solution from porous media. This forms a basis for collaborations with SFB project areas A and C as well as associated projects.

Photos of sample surfaces with different types of salt crusts. The crusts were formed by evaporation of different saline solutions with a concentration equal to 33% of the maximum corresponding solubility. Left: Efflorescent sodium chloride (NaCl) crust. Middle: Subflorescent magnesium sulfate (MgSO4) crust. Right: Subflorescent sodium sulfate (Na2SO4) crust with efflorescent patches.
Left: Sketch of the gas permeability set-up with flow controller Q and pressure transducer P, modified from Piotrowski et al. (2020). Right: Differential pressure as a function of flow rate for a sodium chloride (NaCl) crust with permeability k and crust thickness s.
© Joseph Piotrowski

Left: Volume fraction of sand, salt, and voids as a function of depth for a MgSO4 crust in medium sand obtained from segmentation of XRCT images. The yellow dashed line indicates the gravimetrically determined original sand fraction before salt precipitation. Right: Representative slice inside the crust indicated by the black dashed line with a resolution of 4 mm and a diameter of 12 mm.

Induced calcite precipitation

Microbially-induced calcite precipitation (MICP) is a promising technology for building underground barriers, soil consolidation, well bore sealing, and to support CO2 sequestration. The changes in effective hydraulic properties such as porosity and permeability in response to biofilm growth and calcite precipitation are not very well understood. As a first step, flow experiments in sand columns with enzymatically-induced precipitation are being used to study the impact of calcite precipitation on the effective hydraulic properties in the absence of biofilm growth. At the same time, non-invasive imaging with MRI and µXRCT provide insights into the evolving pore space and into the development of preferential flow paths. The evolution of the permeability is determined by pressure measurements and correlated to the observed changes in pore space.

Future Work

In the case of salt precipitation during evaporation, future experimental work in this project will focus on time-lapse imaging of evaporation processes and crust formation in homogeneous and heterogeneous porous media in order to obtain information on the development of the hydraulic properties of salt crusts, soil water content dynamics in salt crusts, as well as the deformation of unconsolidated porous media due to crust formation. In the case of induced calcite precipitation, the focus will be on non-invasive imaging of MICP using the developed experimental approach, which adds the complication of understanding how the presence of biofilms affect the porosity and permeability of porous media. The experimental data obtained in this project will provide valuable input for REV-scale modelling, which will be pursued in collaboration with partners from project areas A and C and associated partners.

International Cooperation

Montana State University

The gas permeameter set-up was developed in collaboration with Uri Nachshon from the Volcani Institute, Beer’Sheva, Israel. The work on induced calcite precipitation benefits from the close connection of the SFB1313 with MSU Bozeman, USA.

For further information please contact

This picture showsJ. A. (Sander) Huisman
Prof. Dr.

J. A. (Sander) Huisman

Principal Investigator, Research Project C05

This picture showsAndreas Pohlmeier

Andreas Pohlmeier

Principal Investigator, Research Project C05

This picture showsHolger Steeb
Prof. Dr.-Ing.

Holger Steeb

Principal Investigator, Research Projects B05 and C05

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