Electrokinetic movement of suspended colloids in a flowing medium. II. Experimental investigation
| Autor: | R. D. Brazee, M.Y Hamdy, E.A Hiler, R.B Curry |
|---|---|
| Rok vydání: | 1972 |
| Předmět: |
Chemistry
Analytical chemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Suspension (chemistry) Volumetric flow rate Biomaterials Colloid Electrokinetic phenomena Colloid and Surface Chemistry Electric field Transmittance Mass concentration (chemistry) Boundary value problem |
| Zdroj: | Journal of Colloid and Interface Science. 40:278-289 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/0021-9797(72)90018-5 |
| Popis: | An experimental model was constructed to test the theory developed in Part I. In this model, stainless-steel electrodes were utilized in a parallel-plate configuration. The suspensions studied were prepared from colloidal kaolin and deionized water. The influent concentration of suspension was maintained at 60 mg 1 −1 . The flow rate of suspension was 250 ml min −1 , while the electric field strength between the electrodes was 100 v cm −1 . Mass concentration of suspension was measured at various points in the system both in situ on a continuous basis and by withdrawing samples. Both methods involved light transmittance measurements. The following flow characteristics of the medium were measured with a hot-film sensor and related equipment: (a) mean velocity profile, and the (b) root-mean-square (rms), (c) autocorrelation, and (d) spectral density of the random velocity component. The theoretical equations with appropriate boundary conditions were solved on a digital computer using a continuous system modeling program to provide a comparison of theoretical and experimental results. This analysis indicated that the theoretical equations developed in this study for Brownian and convective dispersion conditions provide a valid description of the electrokinetic movement of charged colloids suspended in flowing water. |
| Databáze: | OpenAIRE |
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