High-Resolution Temporo-Ensemble PIV to Resolve Pore-Scale Flow in 3D-Printed Fractured Porous Media

Ahkami, Mehrdad; Roesgen, T.; Saar, Martin O.; Kong, Xiang-Zhao

doi:10.1007/s11242-018-1174-3

Cited by 22 publications

(13 citation statements)

References 65 publications

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“…They found 3D printed rock proxies with fracture networks to be very helpful for performing experiments and using experimental results for validating mathematical models. Recently, Ahkami et al [ 62 ] fabricated a 2D fractured porous medium using 3D printing. They employed a new high-resolution PIV method ( Section 3.1.4 ) in order to investigate fluid flow behavior within the pores, open and dead-ended fractures simultaneously.…”

Section: Microfluidic Devices (Physical Micromodels Of Porous Geommentioning

confidence: 99%

Review of Microfluidic Devices and Imaging Techniques for Fluid Flow Study in Porous Geomaterials

Jahanbakhsh

Wlodarczyk

Hand

et al. 2020

Sensors

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Understanding transport phenomena and governing mechanisms of different physical and chemical processes in porous media has been a critical research area for decades. Correlating fluid flow behaviour at the micro-scale with macro-scale parameters, such as relative permeability and capillary pressure, is key to understanding the processes governing subsurface systems, and this in turn allows us to improve the accuracy of modelling and simulations of transport phenomena at a large scale. Over the last two decades, there have been significant developments in our understanding of pore-scale processes and modelling of complex underground systems. Microfluidic devices (micromodels) and imaging techniques, as facilitators to link experimental observations to simulation, have greatly contributed to these achievements. Although several reviews exist covering separately advances in one of these two areas, we present here a detailed review integrating recent advances and applications in both micromodels and imaging techniques. This includes a comprehensive analysis of critical aspects of fabrication techniques of micromodels, and the most recent advances such as embedding fibre optic sensors in micromodels for research applications. To complete the analysis of visualization techniques, we have thoroughly reviewed the most applicable imaging techniques in the area of geoscience and geo-energy. Moreover, the integration of microfluidic devices and imaging techniques was highlighted as appropriate. In this review, we focus particularly on four prominent yet very wide application areas, namely “fluid flow in porous media”, “flow in heterogeneous rocks and fractures”, “reactive transport, solute and colloid transport”, and finally “porous media characterization”. In summary, this review provides an in-depth analysis of micromodels and imaging techniques that can help to guide future research in the in-situ visualization of fluid flow in porous media.

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Section: Microfluidic Devices (Physical Micromodels Of Porous Geommentioning

confidence: 99%

Review of Microfluidic Devices and Imaging Techniques for Fluid Flow Study in Porous Geomaterials

Jahanbakhsh

Wlodarczyk

Hand

et al. 2020

Sensors

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“…First, to underline the flexibility of our algorithm, we calculate the permeability of a microfluidic device. Similar to the setup presented in Ahkami et al (2018), we consider a two‐dimensional device hosting a fractured porous medium with an inlet at the left end. More precisely, one horizontal fracture in the direction of main flow separates two porous matrices of porosity 0.21 (upper) and 0.29 (lower), consisting of square‐shaped inclusions.…”

Section: Simulations Of Hydraulic Parametersmentioning

confidence: 99%

“…As a motivation, we study the evolution of and relation between the porosity and reactive surface, also in the situation of a changing topology. Moreover, the permeability is investigated for a microfluidic device similar to Ahkami et al (2018) as well as for the dissolution of mineral composites adapted from Ellis et al (2011). We observe that eigenvalues with value zero may become positive in a setup involving topological changes in the microstructure.…”

Section: Introductionmentioning

confidence: 99%

Efficiency and Accuracy of Micro‐Macro Models for Mineral Dissolution

Gärttner

Frolkovič

Knabner

et al. 2020

Water Resources Research

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Micro‐macro models for dissolution processes are derived from detailed pore‐scale models applying upscaling techniques. They consist of flow and transport equations at the scale of the porous medium (macroscale). Both include averaged time‐ and space‐dependent coefficient functions (permeability, porosity, reactive surface, and effective diffusion). These are in turn explicitly computed from the time‐ and space‐dependent geometry of unit cells and by means of auxiliary cell problems defined therein (microscale). The explicit geometric structure is characterized by a level set. For its evolution, information from the transport equations solutions is taken into account (micro‐macro scales). A numerical scheme is introduced, which is capable of evaluating such complex settings. For the level‐set equation a second‐order scheme is applied, which enables us to accurately determine the dynamic reactive surface. Local mesh refinement methods are applied to evaluate Stokes type cell problems using P2/P1 elements and a Uzawa type linear solver. Applications of our permeability solver to scenarios involving static and evolving geometries are presented. Furthermore, macroscopic flow and transport equations are solved applying mixed finite elements. Finally, adaptive strategies to overcome the computational burden are discussed. We apply our approach to the dissolution of an array of dolomite grains in the micro‐macro context and validate our numerical scheme.

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“…(2) Validation with 4D Experiments. Challenges should also be focused on validation of numerical predictions [6] on pore-scale processes using wellcontrolled laboratory experiments [7,8]. It has been extremely difficult to visualize 3D time-series (i.e., 4D) data during laboratory experiments that investigate reactive transport through a porous and/or fractured medium at sufficient spatial and temporal resolutions, because the processes of interest occur (deep) inside the medium of interest.…”

Section: Next Challengesmentioning

confidence: 99%

Contribution of Pore-Scale Approach to Macroscale Geofluids Modelling in Porous Media

et al. 2019

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High-Resolution Temporo-Ensemble PIV to Resolve Pore-Scale Flow in 3D-Printed Fractured Porous Media

Cited by 22 publications

References 65 publications

Review of Microfluidic Devices and Imaging Techniques for Fluid Flow Study in Porous Geomaterials

Review of Microfluidic Devices and Imaging Techniques for Fluid Flow Study in Porous Geomaterials

Efficiency and Accuracy of Micro‐Macro Models for Mineral Dissolution

Contribution of Pore-Scale Approach to Macroscale Geofluids Modelling in Porous Media

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