| Issue |
EPL
Volume 78, Number 4, May 2007
|
|
|---|---|---|
| Article Number | 46001 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/78/46001 | |
| Published online | 03 May 2007 | |
Scaling behaviours in settling process of fractal aggregates in water
1
Surface Physics Laboratory and Department of Physics, Fudan University - Shanghai 200433, China
2
Department of Applied Physics, Hokkaido University - Sapporo 060-8628, Japan
3
Department of Physics and Institute of Theoretical Physics, Chinese University of Hong Kong - Shatin, New Territories, Hong Kong, China
Corresponding authors: tnaka@eng.hokudai.ac.jp jphuang@fudan.edu.cn
Received:
22
February
2007
Accepted:
4
April
2007
We investigate the effect of permeant flow on the sedimentation of porous fractal-aggregates in water. Our theoretical analysis gives explicit calculations on the scaling behaviours of settling velocities, taking into account the fractality through a proper permeability for fractal aggregates. The calculated results for the scaling behaviours of settling velocities fit remarkably well with experimental data. The analytic expression for the settling velocity provides a criterion for determining fractal dimensions Df of aggregates from sedimentation experiments.
PACS: 61.43.Hv – Fractals; macroscopic aggregates (including diffusion-limited aggregates) / 47.57.-s – Complex fluids and colloidal systems / 92.20.Vn – Sedimentation
© Europhysics Letters Association, 2007
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