Quantification of the velocity acceleration factor for colloidal transport in porous media using NMR

Creber, S.A.; Pintelon, T.R.R.; Johns, Michael L.

doi:10.1016/j.jcis.2009.07.017

Cited by 19 publications

(12 citation statements)

References 30 publications

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“…If during its trajectory, a cell gets displaced into a solid grid node, it will permanently attach provided the local shear stress, t, is less than some critical shear stress value, t c , which is related to the cell-surface adhesion strength. A variant of this algorithm was successfully used to describe colloidal migration through porous media (Creber et al, 2009), which was successfully validated against NMR data, which took the form of displacement propagators. The DRW algorithm is also used here to simulate the measured water displacement propagators through the fouled MFS.…”

Section: Biofilm Simulation Modelmentioning

confidence: 99%

Validation of 3D simulations of reverse osmosis membrane biofouling

Pintelon

Creber

Schulenburg

et al. 2010

Biotech & Bioengineering

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The increasing demand for drinking water and its stricter quality requirements have resulted in an exponentially expanding industry of membrane filtration processes. Currently, reverse osmosis (RO) is the most common method of desalination, able to produce water that is virtually free of pollutants and pathogenic micro-organisms. Biofouling of these devices however is a significant limitation. Here we present a 3D simulation of RO membrane biofouling based on a lattice Boltzmann (LB) platform that we subsequently favorably compare with experimental data. This data consists of temporally (and spatially) resolved velocity measurements acquired for a RO membrane using magnetic resonance techniques. The effect of biofilm cohesive strength on system pressure drop is then explored; weaker biomass is observed to have a reduced impact on pressure drop (per unit biomass accumulated).

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Section: Biofilm Simulation Modelmentioning

confidence: 99%

Validation of 3D simulations of reverse osmosis membrane biofouling

Pintelon

Creber

Schulenburg

et al. 2010

Biotech & Bioengineering

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“…There is reasonable agreement between experimental and simulation results consistent with previous publications. 28,[38][39][40] The simulated propagators are slightly broader (i.e., have a larger second moment) than the corresponding experimental propagators. We speculate this difference to be a consequence of the significantly smaller column-diameter to particle diameter ratio used for the simulations compared with that in the actual column.…”

Section: Simulationsmentioning

confidence: 83%

“…This method is the same, essentially, as that used by Manz et al (1999), 27 where further details of the methodology can be sourced. Subsequently, this simulation methodology has been used extensively in the literature in this capacity, 28,[38][39] and features frequent favorable quantitative comparisons of simulated displacement propagators against corresponding experimental results. The LB technique used is based on the modified lattice Bhatnagar-Gross-Krook method.…”

Section: Simulation Methodologymentioning

confidence: 99%

“…A similar simulation lattice generation procedure has been successfully used before. 39 Sample transverse and axial 2D slices extracted from the 3D simulation lattice are shown in Figures 4a and b. This was the largest simulation domain computationally possible with our resources, presenting a column-to-bead diameter ratio of 16; generally a ratio of 10 is considered sufficient to minimise wall packing effects.…”

Section: Simulation Methodologymentioning

confidence: 99%

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Using NMR displacement measurements to probe CO2 entrapment in porous media

et al. 2010

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in Wiley Online Library (wileyonlinelibrary.com).Carbon dioxide sequestration in aquifers is seen as a potential climate change mitigation technique. One physical mechanism by which this could occur is capillary trapping of discrete pore-scale CO 2 bubbles (referred to as ganglia) in the pore space. Nuclear magnetic resonance (NMR) techniques were used to quantify the spatial distribution and pore environment of such CO 2 entrapment in a model porous medium (random glass bead packing). 3D images revealed a relatively macroscopically homogeneous CO 2 entrapment, even though the image resolution is insufficient to resolve individual CO 2 ganglia. Quantification of the pore environment of the CO 2 ganglia was achieved using NMR displacement propagators (displacement probability distributions), acquired both before and after CO 2 entrapment. Lattice Boltzmann (LB) simulations were used to facilitate interpretation of the propagator statistics by considering various pore environments in which CO 2 could become trapped. Comparison with the experimental data suggests that CO 2 is preferentially entrapped in comparatively larger pores.

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“…sponges, trabecellular bones, filters [8]. The application of NMR in the study of colloid suspension transport in porous media allows for the non-invasive phase resolved observation of spatial and temporal transport dynamics [9][10][11] and therefore marks a significant advance in the experimental study of colloid suspension transport in porous media.…”

Section: Introductionmentioning

confidence: 99%