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• W2000594654 abstract "Flow-induced aggregation of colloidal particles leads to aggregates with fairly high fractal dimension $({d}_{f}ensuremath{simeq}2.4--3.0)$ which are directly responsible for the observed rheological properties of sheared dispersions. We address the problem of the decrease in aggregate size with increasing hydrodynamic stress, as a consequence of breakup, by means of a fracture-mechanics model complemented by experiments in a multipass extensional (laminar) flow device. Evidence is shown that as long as the inner density decay with linear size within the aggregate (due to fractality) is not negligible (as for ${d}_{f}ensuremath{simeq}2.4--2.8$), this imposes a substantial limitation to the hydrodynamic fragmentation process as compared with nonfractal aggregates (where the critical stress is practically size independent). This is due to the fact that breaking up a fractal object leads to denser fractals which better withstand stress. In turbulent flows, accounting for intermittency introduces just a small deviation with respect to the laminar case, while the model predictions are equally in good agreement with experiments from the literature. Our findings are summarized in a diagram for the breakup exponent (governing the size versus stress scaling) as a function of fractal dimension." @default.
• W2000594654 created "2016-06-24" @default.
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• W2000594654 date "2009-06-03" @default.
• W2000594654 modified "2023-10-17" @default.
• W2000594654 title "Breakup of dense colloidal aggregates under hydrodynamic stresses" @default.
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• W2000594654 doi "https://doi.org/10.1103/physreve.79.061401" @default.
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