Microscopic velocity field measurements inside a regular porous medium adjacent to a low Reynolds number channel flow

Terzis, Alexandros; Zarikos, I.; Weishaupt, Kilian; Yang, Guang; Chu, Xu; Helmig, Rainer

doi:10.1063/1.5092169

Cited by 49 publications

(44 citation statements)

References 67 publications

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“…Since the free-flow model of DuMu x is not parallelized yet, we use the opensource CFD tool OpenFOAM (Jasak 2009) for obtaining the stationary flow field in this case for sake of efficiency. A close match between the reference solution and the experimental data of Terzis et al (2019) is found, as shown in Appendix 1. For the coupled model, we simplify the micromodel geometry by reducing it to a two-dimensional plane where the z-coordinate and all velocities in this direction are omitted.…”

Section: Recalculation Of a Micromodel Experimentssupporting

confidence: 65%

“…In this section, we use the coupled model to recalculate a micromodel experiment of Terzis et al (2019) where we exploit the quasi-two-dimensional nature of the experimental setup. The latter is especially suited for applying the proposed slip condition (Eq.…”

Section: Recalculation Of a Micromodel Experimentsmentioning

confidence: 99%

“…This inlet was closed during the experiments. Details on the experimental procedure can be found in Terzis et al (2019). For convenience, two dimensionless lengths x/l and y/l are introduced, where l = 240 × 10 −6 m is the width of the pores in the porous region.…”

Section: Recalculation Of a Micromodel Experimentsmentioning

confidence: 99%

“…Finally, we use the coupled model to recalculate high-resolution micro-Particle Image Velocimetry (micro-PIV) experiments performed on a micromodel comprising a free-flow channel over a regular porous structure at low Reynolds numbers (Terzis et al 2019). Here, we exploit the micromodel's flat geometry which permits the use of a two-dimensional free-flow model including a wall friction term (Flekkøy et al 1995) in order to save computational cost.…”

Section: Introductionmentioning

confidence: 99%

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A Hybrid-Dimensional Coupled Pore-Network/Free-Flow Model Including Pore-Scale Slip and Its Application to a Micromodel Experiment

et al. 2020

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Modeling coupled systems of free flow adjacent to a porous medium by means of fully resolved Navier–Stokes equations is limited by the immense computational cost and is thus only feasible for relatively small domains. Coupled, hybrid-dimensional models can be much more efficient by simplifying the porous domain, e.g., in terms of a pore-network model. In this work, we present a coupled pore-network/free-flow model taking into account pore-scale slip at the local interfaces between free flow and the pores. We consider two-dimensional and three-dimensional setups and show that our proposed slip condition can significantly increase the coupled model’s accuracy: compared to fully resolved equidimensional numerical reference solutions, the normalized errors for velocity are reduced by a factor of more than five, depending on the flow configuration. A pore-scale slip parameter $$\beta _{{{{\rm pore}}}}$$ β pore required by the slip condition was determined numerically in a preprocessing step. We found a linear scaling behavior of $$\beta _{{{{\rm pore}}}}$$ β pore with the size of the interface pore body for three-dimensional and two-dimensional domains. The slip condition can thus be applied without incurring any run-time cost. In the last section of this work, we used the coupled model to recalculate a microfluidic experiment where we additionally exploited the flat structure of the micromodel which permits the use of a quasi-3D free-flow model. The extended coupled model is accurate and efficient.

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Section: Recalculation Of a Micromodel Experimentssupporting

confidence: 65%

Section: Recalculation Of a Micromodel Experimentsmentioning

confidence: 99%

Section: Recalculation Of a Micromodel Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Hybrid-Dimensional Coupled Pore-Network/Free-Flow Model Including Pore-Scale Slip and Its Application to a Micromodel Experiment

et al. 2020

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“…The literature contains studies of velocity measurements of random porous media [11]. However, the two-dimensional model as explored in this study, is still appropriate [12] and relevant for this study because of its practical utility to provide valuable insight into flow phenomena that may be applied in real cases such as banks of heat exchanger tubes and fibrous porous media. It should be noted that this model has been used in previous numerical [5,6,10] analytical [13], and experimental studies [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of porous medium structural effects on a coupled porous media-free zone laminar flow

Arthur

2019

SN Appl. Sci.

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An experimental research program was conducted to investigate the effects of solid volume fraction, arrangement of rods, and rod shape on slow flow through and over two-dimensional model porous media. The porous media were modeled using in-line and staggered arrays of rods of circular and square cross-sections to cover a range of solid volume fraction of 0.06 to 0.49. Each model was installed into a test section so as to fill three-quarters of the total depth of the flow section; and the flow was driven through the test section by pressure. Using a refractive-index matched viscous fluid, the bulk Reynolds numbers for the respective test conditions were kept considerably lower than unity. Particle image velocimetry measurements were made across the streamwise-transverse plane of the test section. Results indicate that the flow through the free zone increases from 75% to nearly 100% as the solid volume fraction increases from 0.06 to 0.49. While the bulk distribution is independent of the shape of the rods, or the mode of arrangement, at the interface, penetration of the free flow is dependent on the solid volume fraction and arrangement of rods. The interfacial flow is predicted by a new formulation from which a boundary condition is derived which unlike others in the literature, is devoid of jumps at the interface. This work provides detailed experimental data and important predictive tools for validations of theoretical and numerical work.

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Interface-Resolved Direct Numerical Simulation of Turbulent Flow over Porous Media

Chu

Müller

2021

High Performance Computing in Science and Engineering '19

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Microscopic velocity field measurements inside a regular porous medium adjacent to a low Reynolds number channel flow

Abstract: Microscopic velocity field measurements inside a regular porous medium adjacent to a low Reynolds number channel flow. Physics of Fluids, 31(4), [042001].

Cited by 49 publications

References 67 publications

A Hybrid-Dimensional Coupled Pore-Network/Free-Flow Model Including Pore-Scale Slip and Its Application to a Micromodel Experiment

A Hybrid-Dimensional Coupled Pore-Network/Free-Flow Model Including Pore-Scale Slip and Its Application to a Micromodel Experiment

Experimental investigation of porous medium structural effects on a coupled porous media-free zone laminar flow

Interface-Resolved Direct Numerical Simulation of Turbulent Flow over Porous Media

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