Volume 78, Number 4, May 2007
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||03 May 2007|
Scaling behaviours in settling process of fractal aggregates in water
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
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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