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Numerical simulations of aggregate breakup in bounded and unbounded turbulent flows
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.ORCID iD: 0000-0001-7995-3151
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0002-4346-4732
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2015 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 766Article in journal (Refereed) Published
Abstract [en]

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 sigma similar to epsilon(1/2), with epsilon being the energy dissipation at the position of the aggregate, overcomes a given threshold sigma(cr), 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.

Place, publisher, year, edition, pages
2015. Vol. 766
Keyword [en]
breakup/coalescence, multiphase and particle-laden flows, turbulent flows
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-161602DOI: 10.1017/jfm.2015.13ISI: 000349076900008ScopusID: 2-s2.0-84946893826OAI: diva2:797996

QC 20150325

Available from: 2015-03-25 Created: 2015-03-13 Last updated: 2015-03-25Bibliographically approved

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Bäbler, MatthäusBrandt, LucaPicano, FrancescoSardina, Gaetano
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Energy ProcessesMechanicsLinné Flow Center, FLOWSeRC - Swedish e-Science Research Centre
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Journal of Fluid Mechanics
Fusion, Plasma and Space Physics

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