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    Marchioli, Cristian and Soldati, Alfredo 2015. Turbulent breakage of ductile aggregates. Physical Review E, Vol. 91, Issue. 5,


    Solsvik, Jannike and Jakobsen, Hugo A. 2016. A review of the statistical turbulence theory required extending the population balance closure models to the entire spectrum of turbulence. AIChE Journal, Vol. 62, Issue. 5, p. 1795.


    Pozorski, Jacek 2017. Particles in Wall-Bounded Turbulent Flows: Deposition, Re-Suspension and Agglomeration.


    Saha, Debashish Babler, Matthaus U. Holzner, Markus Soos, Miroslav Lüthi, Beat Liberzon, Alex and Kinzelbach, Wolfgang 2016. Breakup of Finite-Size Colloidal Aggregates in Turbulent Flow Investigated by Three-Dimensional (3D) Particle Tracking Velocimetry. Langmuir, Vol. 32, Issue. 1, p. 55.


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  • Journal of Fluid Mechanics, Volume 766
  • March 2015, pp. 104-128

Numerical simulations of aggregate breakup in bounded and unbounded turbulent flows

  • Matthaus U. Babler (a1), Luca Biferale (a2), Luca Brandt (a3), Ulrike Feudel (a4), Ksenia Guseva (a4), Alessandra S. Lanotte (a5), Cristian Marchioli (a6) (a7), Francesco Picano (a3) (a8), Gaetano Sardina (a3), Alfredo Soldati (a6) (a7) and Federico Toschi (a9) (a10)
  • DOI: http://dx.doi.org/10.1017/jfm.2015.13
  • Published online: 02 February 2015
Abstract
Abstract

Breakup of small aggregates in fully developed turbulence is studied by means of direct numerical simulations in a series of typical bounded and unbounded flow configurations, such as a turbulent channel flow, a developing boundary layer and homogeneous isotropic turbulence. The simplest criterion for breakup is adopted, whereby aggregate breakup occurs when the local hydrodynamic stress σε1/2, with ε being the energy dissipation at the position of the aggregate, overcomes a given threshold σcr, which is characteristic for a given type of aggregate. Results show that the breakup rate decreases with increasing threshold. For small thresholds, it develops a scaling behaviour among the different flows. For high thresholds, the breakup rates show strong differences between the different flow configurations, highlighting the importance of non-universal mean-flow properties. To further assess the effects of flow inhomogeneity and turbulent fluctuations, the results are compared with those obtained in a smooth stochastic flow. Furthermore, we discuss the limitations and applicability of a set of independent proxies.

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Corresponding author
Email address for correspondence: babler@kth.se
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Journal of Fluid Mechanics
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