scholarly journals Transport Behavior of Selected Nanoparticles with different Surface Coatings in Granular Porous Media coated withPseudomonas aeruginosaBiofilm

2011 ◽  
Vol 46 (13) ◽  
pp. 6942-6949 ◽  
Author(s):  
Shweta Tripathi ◽  
Denis Champagne ◽  
Nathalie Tufenkji
Keyword(s):  
Porous Media ◽  
Surface Coatings ◽  
Transport Behavior ◽  
Granular Porous Media

Effect of freeze/thaw on aggregation and transport of nano-TiO2 in saturated porous media

2020 ◽  
Vol 7 (6) ◽  
pp. 1781-1793 ◽  
Author(s):  
Jeffrey M. Farner ◽  
Jacopo De Tommaso ◽  
Heather Mantel ◽  
Rachel S. Cheong ◽  
Nathalie Tufenkji
Keyword(s):  
Porous Media ◽  
Temperature Variability ◽  
Saturated Porous Media ◽  
Nano Tio2 ◽  
Freeze Thaw ◽  
Transport Behavior ◽  
Winter Conditions ◽  
Granular Porous Media

Research has focused on nanoparticle (NP) aggregation and transport behavior in saturated granular porous media, but few studies have looked at the effect that temperature variability associated with winter conditions will have on engineered NPs.

Analysis of process of emulsions transport in hydrophilic/oleophilic granular porous media driven by capillary force

2018 ◽  
Vol 2 (21) ◽  
pp. 85-101
Author(s):  
Olga Shtyka ◽  
Łukasz Przybysz ◽  
Mariola Błaszczyk ◽  
Jerzy P. Sęk
Keyword(s):  
Porous Media ◽  
Experimental Research ◽  
Granular Media ◽  
Single Phase ◽  
Influential Factor ◽  
Dispersed Phase ◽  
Porous Structures ◽  
Phase Concentration ◽  
Granular Porous Media ◽  
Kinetics Of

The research focuses on the issues concerning a process of multiphase liquids transport in granular porous media driven by the capillary pressure. The current publication is meant to introduce the results of experimental research conducted to evaluate the kinetics of the imbibition and emulsions behavior inside the porous structures. Moreover, the influence of the dispersed phase concentration and granular media structure on the mentioned process was considered. The medium imbibition with emulsifier-stabilized emulsions composed of oil as the dispersed phase in concentrations of 10 vol%, 30 vol%, and 50 vol%, was investigated. The porous media consisted of oleophilic/hydrophilic beads with a fraction of 200–300 and 600–800 μm. The experimental results provided that the emulsions imbibition in such media depended stronger on its structure compare to single-phase liquids. The increase of the dispersed phase concentration caused an insignificant mass decreasing of the imbibed emulsions and height of its penetration in a sorptive medium. The concentrations of the imbibed dispersions exceeded their initial values, but reduced with permeants front raise in the granular structures that can be defined as the influential factor for wicking process kinetics.

scholarly journals Waterfall Algorithm as a tool of investigation the geometrical features of granular porous media

2021 ◽  
Author(s):  
Wojciech Sobieski
Keyword(s):  
Particle Size ◽  
Porous Media ◽  
Lattice Boltzmann ◽  
Granular Media ◽  
Density Ratio ◽  
Geometrical Features ◽  
Granular Porous Media ◽  
Collision Density ◽  
Boltzmann Method ◽  
The Impact

AbstractThe paper describes the so-called Waterfall Algorithm, which may be used to calculate a set of parameters characterising the spatial structure of granular porous media, such as shift ratio, collision density ratio, consolidation ratio, path length and minimum tortuosity. The study is performed for 1800 different two-dimensional random pore structures. In each geometry, 100 individual paths are calculated. The impact of porosity and the particle size on the above-mentioned parameters is investigated. It was stated in the paper, that the minimum tortuosity calculated by the Waterfall Algorithm cannot be used directly as a representative tortuosity of pore channels in the Kozeny or the Carman meaning. However, it may be used indirect by making the assumption that a unambiguous relationship between the representative tortuosity and the minimum tortuosity exists. It was also stated, that the new parameters defined in the present study are sensitive on the porosity and the particle size and may be therefore applied as indicators of the geometry structure of granular media. The Waterfall Algorithm is compared with other methods of determining the tortuosity: A-Star Algorithm, Path Searching Algorithm, Random Walk technique, Path Tracking Method and the methodology of calculating the hydraulic tortuosity based on the Lattice Boltzmann Method. A very short calculation time is the main advantage of the Waterfall Algorithm, what meant, that it may be applied in a very large granular porous media.

scholarly journals Wettability-dependent Wave Velocities and Attenuation in Granular Porous Media

2021 ◽  
Author(s):  
Jimmy Xuekai Li ◽  
Reza Rezaee ◽  
Tobias M. Müller ◽  
Mahyar Madadi ◽  
Rupeng Ma ◽  
...  
Keyword(s):  
Porous Media ◽  
Wave Velocities ◽  
Granular Porous Media

scholarly journals Electrokinetic-enhanced removal of toluene from physically heterogeneous granular porous media

2020 ◽  
pp. qjegh2020-073
Author(s):  
Richard Thomas Gill ◽  
Steven Thornton ◽  
Michael J. Harbottle ◽  
Jonathan W. N. Smith
Keyword(s):  
Porous Media ◽  
Transport Processes ◽  
Effective Mechanism ◽  
Content Type ◽  
Bench Scale ◽  
Toluene Concentration ◽  
Granular Porous Media ◽  
Supplementary Material ◽  
Scale Experiment ◽  
Water Saturated

Electrokinetics (EK) was applied to enhance biodegradation of toluene in the low hydraulic conductivity (K) zone of a physically heterogeneous water-saturated granular porous media. The hypothesis tested was that EK transport processes, which operate independently of advection, can deliver a limiting amendment, nitrate, across a high-K–low-K boundary to stimulate bioremediation. Two types of experiment were evaluated: (1) bench-scale tests that represented the active EK system and physically heterogeneous sediment configuration; (2) microcosms that represented biodegradation in the bench-scale tests under ideal conditions. The bench-scale experiment results showed a rapid decrease in toluene concentration during the application of EK that was attributed to electroosmotic removal from low-K zones. Comparison of toluene removal rates by electroosmosis and biodegradation (microcosm) confirmed that electroosmosis was the most effective mechanism under the conditions evaluated. Overall, this work challenges the original hypothesis and indicates that, at the field scale, the most favourable conditions for biodegradation are likely to be achieved by applying EK to increase contaminant flux across the low-K–high-K boundary (out of the low-K zone) and allowing biodegradation to occur in the high-K zone either by natural attenuation or enhanced by amendment addition.Supplementary material: Supplementary material is available at https://doi.org/10.6084/m9.figshare.c.5174554

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