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Vassileva ND, van den Ende D, Mugele F, et al. Restructuring and break-up of two-dimensional aggregates in shear flow. Langmuir. 2006;22(11):4959-67doi: 10.1021/la053460k.
Vassileva, N. D., van den Ende, D., Mugele, F., & Mellema, J. (2006). Restructuring and break-up of two-dimensional aggregates in shear flow. Langmuir : the ACS journal of surfaces and colloids, 22(11), 4959-67. https://doi.org/10.1021/la053460k
Vassileva, Nikolina D, et al. "Restructuring and break-up of two-dimensional aggregates in shear flow." Langmuir : the ACS journal of surfaces and colloids vol. 22,11 (2006): 4959-67. doi: https://doi.org/10.1021/la053460k
Vassileva ND, van den Ende D, Mugele F, Mellema J. Restructuring and break-up of two-dimensional aggregates in shear flow. Langmuir. 2006 May 23;22(11):4959-67. doi: 10.1021/la053460k. PMID: 16700581.
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Langmuir. 2006 May 23;22(11):4959-67. doi: 10.1021/la053460k.

Restructuring and break-up of two-dimensional aggregates in shear flow.

Langmuir : the ACS journal of surfaces and colloids

Nikolina D Vassileva, Dirk van den Ende, Frieder Mugele, Jorrit Mellema

Affiliations

  1. Physics of Complex Fluids, Department of Science and Technology, Institute of Mechanics, Processes and Control-Twente, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

PMID: 16700581 DOI: 10.1021/la053460k

Abstract

We consider single two-dimensional aggregates, containing glass particles, placed at a water/air interface. We have investigated the critical shear rate for break-up of aggregates with different sizes in a simple shear flow. All aggregates break-up nearly at the same shear rate (1.8 +/- 0.2 s(-)(1)) independent of their size. The evolution of the aggregate structure before break-up was also investigated. With increasing shear rate, the aggregates adopt a more circular shape, and the particles order in a more dense, hexagonal structure. A simple theoretical model was developed to explain the experimentally observed break-up. In the model, the aggregate is considered as a solid circular disk that will break near its diameter. The capillary and drag force on the two parts of the aggregate were calculated, and from this force balance, the critical shear rate was found. The model shows a weak size dependence of the critical shear rate for the considered aggregates. This is consistent with the experimental observations.

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