Experimental study of porous media flow using hydro-gel beads and LED based PIV

Harshani, H. M. D.; Galindo‐Torres, S. A.; Scheuermann, Alexander; Mühlhaus, H. B.

doi:10.1088/1361-6501/28/1/015902

Cited by 24 publications

(20 citation statements)

References 32 publications

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“…However, they are often difficult to scale-up due to issues related to long-time properties of the suspending solution, thermal stability, handling and cost. Super-absorbent hydrogel particles in water, used in this study, can be advantageously used for performing RIM-PIV as previously shown in Klein et al [13], Byron and Variano [14] and Harshani et al [15]. The mechanical properties of commercially available spherical hydrogel particles are discussed in Dijksman et al [16].…”

Section: Introductionmentioning

confidence: 90%

Buoyant finite-size particles in turbulent duct flow

et al. 2019

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Particle Image Velocimetry (PIV) and Particle Tracking Velocimetry (PTV) have been employed to investigate the dynamics of finite-size spherical particles, slightly heavier than the carrier fluid, in a horizontal turbulent square duct flow. Interface resolved Direct Numerical Simulations (DNS) have also been performed with the Immersed Boundary Method (IBM) at the same experimental conditions, bulk Reynolds number Re 2H = 5600, duct height to particle size ratio 2H/d p = 14.5, particle volume fraction Φ = 1% and particle to fluid density ratio ρ p /ρ f = 1.0035. A good agreement has been observed between experiments and simulations in terms of the overall pressure drop, concentration distribution and turbulent statistics of the two phases. Additional experimental results considering two particle sizes, 2H/d p = 14.5 and 9 and multiple Φ = 1, 2, 3, 4 and 5% are reported at the same Re 2H . The pressure drop monotonically increases with the volume fraction, almost linearly and nearly independently of the particle size for the above parameters. However, despite the similar pressure drop, the microscopic picture, the fluid velocity statistics, differs significantly with the particle size. This one-to-one comparison between simulations and experiments extends the validity of interface resolved DNS in complex turbulent multiphase flows and highlights the ability of experiments to investigate such flows in considerable details, even in regions where the local volume fraction is relatively high. *

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Section: Introductionmentioning

confidence: 90%

Buoyant finite-size particles in turbulent duct flow

et al. 2019

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“…This is due to the difficulties in measuring the flow inside the porous media. The investigations have often used structured porous media, where a laser light sheet can pass through it to illuminate the medium combined with trackable particles following the flow in a standard particle image velocimetry setup [20,21]. Structured porous media, however, cannot provide enough details about flow inside the pores or channeling phenomena that occur due to the interconnectivity of the pores.…”

Section: Introductionmentioning

confidence: 99%

“…In an effort to simplify and reduce the cost of the flow measurement in porous media while achieving RIM, hydrogel beads were used to form the porous media and the medium was illuminated using an LED light source [21]. The longitudinal and transverse velocity fields have been measured and flow channeling has been observed for the interconnected pore paths.…”

Section: Introductionmentioning

confidence: 99%

Micro- and Macro-Scale Measurement of Flow Velocity in Porous Media: A Shadow Imaging Approach for 2D and 3D

Sabbagh

Kazemi

Soltani

et al. 2020

Optics

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Flow measurement in porous media is a challenging subject, especially when it comes to performing a three-dimensional (3D) velocimetry at the micro scale. Volumetric flow measurement techniques such as defocusing and tomographic imaging generally involve rigorous procedures, complex experimental setups, and multi-part data processing procedures. However, detailed knowledge of the flow pattern at the pore and subpore scales is important in interpreting the phenomena that occur inside the porous media and understanding the macro-scale behaviors. In this work, the flow of an oil inside a porous medium is measured at the pore and subpore scales using refractive index matching (RIM) and shadowgraph imaging techniques. At the macro scale, flow is measured using the particle image velocimetry (PIV) method in two dimensions (2D) to confirm the volumetric nature of the flow and obtain the overall flow pattern in the vicinity of the flow entrance and at the far field. At the micro scale, the three-dimensional (3D) flow within an arbitrary volume of the porous medium was quantified using 2D particle-tracking velocimetry (PTV) utilizing the law of conservation of mass. Using the shadowgraphy method and a single camera makes the flow measurement much less complex than the approaches using laser light sheets or multiple cameras with multiple viewing angles.

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“…For porous media with regular shaped and sized grains (usually spheres and cylinders), masking has been successfully applied for RIM-coupled PIV (e.g., Hassan and Dominguez-Ontiveros, 2008;Arthur et al, 2009;Satake et al, 2015;Harshani et al, 2017). In these laboratory studies, the authors imposed regular masking shapes onto the images by an a priori approach before conducting the PIV.…”

Section: Introductionmentioning

confidence: 99%

Particle Seeded Grains to Identify Highly Irregular Solid Boundaries and Simplify PIV Measurements

2019

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Particle image velocimetry (PIV) is a non-invasive technique for measuring velocity fields. It is especially powerful when coupled with refractive index-matching (RIM) to map velocity fields around solid objects. The solid objects are typically removed from the flow field with a masking approach before performing the PIV analysis and mapping the velocity field, thus defined as an a priori method. However, applying this method, with a mask of the correct shape and at the correct location, is difficult, time consuming, and would be potentially unfeasible for packed bed of irregular shaped grains. To address this problem, we present the proof-of-concept of a novel approach to delineate highly irregular granular particles (grains) of varying size and shape and improve PIV processing for flows around grains in laboratory studies. The present technique makes use of seeding transparent RIM solids with light scattering particles during their fabrication. The RIM of the solids preserves the optical fidelity of images and the laser light sheet. Whereas the seeding in the solids can provide image contrast between solid (seeded) and fluid (non-seeded) as well as a strong zero-velocity signal in the solid. The fluid may then be seeded as well, allowing PIV spatial correlations to be performed with high confidence over the entire image. We tested the seeded RIM solid approach with both irregular individual solid pieces as well as with a volume of irregular grains. The new technique effectively obtains the fluid velocity field and solid boundary locations in both cases. Applications of the present method may range from studies of interstitial processes within a simulated sediment bed, such as those of aquifers, soils, sediments and the hyporheic zone, to near bed flow hydraulics.

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Experimental study of porous media flow using hydro-gel beads and LED based PIV

Cited by 24 publications

References 32 publications

Buoyant finite-size particles in turbulent duct flow

Buoyant finite-size particles in turbulent duct flow

Micro- and Macro-Scale Measurement of Flow Velocity in Porous Media: A Shadow Imaging Approach for 2D and 3D

Particle Seeded Grains to Identify Highly Irregular Solid Boundaries and Simplify PIV Measurements

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