Colloid particle size-dependent dispersivity
| Autor: | Vasileios E. Katzourakis, Constantinos V. Chrysikopoulos |
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| Rok vydání: | 2015 |
| Předmět: |
endocrine system
Materials science digestive oral and skin physiology Flow (psychology) Mechanics complex mixtures Condensed Matter::Soft Condensed Matter Colloid Homogeneous TRACER Geotechnical engineering Particle size Dispersion (chemistry) Porous medium Transport studies Water Science and Technology |
| Zdroj: | Water Resources Research. 51:4668-4683 |
| ISSN: | 0043-1397 |
| DOI: | 10.1002/2014wr016094 |
| Popis: | Laboratory and field studies have demonstrated that dispersion coefficients evaluated by fitting advection-dispersion transport models to nonreactive tracer breakthrough curves do not adequately describe colloid transport under the same flow field conditions. Here an extensive laboratory study was undertaken to assess whether the dispersivity, which traditionally has been considered to be a property of the porous medium, is dependent on colloid particle size and interstitial velocity. A total of 48 colloid transport experiments were performed in columns packed with glass beads under chemically unfavorable colloid attachment conditions. Nine different colloid diameters and various flow velocities were examined. The breakthrough curves were successfully simulated with a mathematical model describing colloid transport in homogeneous, water-saturated porous media. The experimental data set collected in this study demonstrated that the dispersivity is positively correlated with colloid particle size, and increases with increasing velocity. The dispersivity values determined in this laboratory study were compared with 380 dispersivity values from earlier laboratory and field-scale solute, colloid and biocolloid transport studies published in the literature. |
| Databáze: | OpenAIRE |
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