Fragmentation and restructuring of soft-agglomerates under shear
Soft-agglomerate restructuring, break-up (or fragmentation) and relaxation are studied in a simple shear flow by a discrete element method (DEM). The agglomerates, held together by van der Waals forces, rotate in the shear flow and are stretched into nearly linear structures (fractal dimension appro...
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| Veröffentlicht in: | Journal of colloid and interface science 2010-02, Vol.342 (2), p.261-268 |
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| container_title | Journal of colloid and interface science |
| container_volume | 342 |
| creator | Eggersdorfer, M.L. Kadau, D. Herrmann, H.J. Pratsinis, S.E. |
| description | Soft-agglomerate restructuring, break-up (or fragmentation) and relaxation are studied in a simple shear flow by a discrete element method (DEM). The agglomerates, held together by van der Waals forces, rotate in the shear flow and are stretched into nearly linear structures (fractal dimension approaches unity) until they fracture at their weakest point resulting in lognormally-shaped fragment size distributions asymptotically. Individual fragments relax in the flow towards more compact agglomerates than the parent ones. The evolution of the average number of particles per fragment is described by generalized scaling laws between shear rate, onset (time-lag) of fragmentation, asymptotic fragment mass and size consistent with experimental and theoretical studies in the literature. The initial effective fractal dimension of the agglomerates influences the final one of the fragments. |
| doi_str_mv | 10.1016/j.jcis.2009.10.062 |
| format | Article |
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| language | eng |
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| subjects | Agglomerate Agglomerates Asymptotic properties Break-up Chemistry Colloidal state and disperse state Company structure Discrete element method Effective fractal dimension Exact sciences and technology Fractal analysis Fractals Fragmentation General and physical chemistry Restructuring Shear flow Surface physical chemistry |
| title | Fragmentation and restructuring of soft-agglomerates under shear |
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