Detachment of deposits from sand grains

Ives, Kenneth J.; Fitzpatrick, Csb

doi:10.1016/0166-6622(89)80190-8

Cited by 13 publications

(9 citation statements)

References 4 publications

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“…Although this hydrodynamic shear appears to have prevented deposit initiation, it was not sufficient to remove existing deposits, as evidenced by the final shear stress of 16 dyne/cm 2 in experiment 2A, which did not reach steady state. The apparent deposit shear strengths in experiments 1, 2A, and 4 between 4 and 16 dyne/cm 2 are similar to those for Namontmorillonite depositing in fractures, τ = 1-8 dyne/cm 2 (33), and to kaolinite depositing in porous media, τ = 2.7-4 dyne/cm 2 (38). The continued increase in head loss, hydrodynamic shear, and deposit strength reflects the dynamic feedback between fluid flow and particle deposition leading to dynamic deposits that evolve over time.…”

Section: Hydrodynamic Shearsupporting

confidence: 68%

Hydrodynamic and Chemical Factors in Clogging by Montmorillonite in Porous Media

Mays

2007

Environ. Sci. Technol.

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Clogging by colloid deposits is important in water treatment filters, groundwater aquifers, and petroleum reservoirs. The complexity of colloid deposition and deposit morphology preclude models based on first principles, so this study extends an empirical approach to quantify clogging using a simple, one-parameter model. Experiments were conducted with destabilized suspensions of sodiumand calcium-montmorillonite to quantify the hydrodynamic and chemical factors important in clogging. Greater clogging is observed at slower fluid velocity, consistent with previous investigations. However, calcium-montmorillonite causes one order of magnitude less clogging per mass of deposited particles compared to sodium-montmorillonite or a previously published summary of clogging in model granular media. Steady state conditions, in which the permeability and the quantity of deposited material are both constant, were not observed, even though the experimental conditions were optimized for that purpose. These results indicate that hydrodynamic aspects of clogging by these natural materials are consistent with those of simplified model systems, and they demonstrate significant chemical effects on clogging for fully destabilized montmorillonite clay.

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Section: Hydrodynamic Shearsupporting

confidence: 68%

Hydrodynamic and Chemical Factors in Clogging by Montmorillonite in Porous Media

Mays

2007

Environ. Sci. Technol.

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“…Tarnai [216] also investigated the rate of deposition of anionic latex on fabrics and its relation to the interaction energy as a function of electrolyte concentration. For each of the three kinds of fabric examined the amount of latex deposited increased with increasing electrolyte concentration (Figure 3.8).…”

Section: Influence Of Experimentally Controllable Parametersmentioning

confidence: 99%

“…When the data were compared to the theory for collection by "combined interaction and gravity", much poorer agreement was found, suggesting that the theory of combined interception and gravity is too crude to predict particle collection from water even under conditions where it seemed exactly coincident with theory. In-situ observations using image analysis have also been used by Ives and Fitzpatrick [216].…”

Section: Measurements At a Passive Collector Surfacementioning

confidence: 99%

Particle Deposition at a Charged Solid/Liquid Interface

Jia

Williams

1990

Chemical Engineering Communications

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“…As EPS particles float, the bed had to be fixed at the working position with the aid of a distribution net placed on its top (3). Ten piezometers (7) were placed in a range of 1.1 m, from the top to the bottom of the bed, at every 10 cm.…”

Section: Experimental Setup Of the Pilot Filtermentioning

confidence: 99%

“…Multimedia beds use even higher density, smaller diameter garnet sand as a third medium layer. This solution increases the initial head loss and reduces run length [1,[5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%