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Numerical simulations of aggregate breakup in bounded and unbounded turbulent flows
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Energiprocesser.ORCID-id: 0000-0001-7995-3151
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Centra, SeRC - Swedish e-Science Research Centre.ORCID-id: 0000-0002-4346-4732
Vise andre og tillknytning
2015 (engelsk)Inngår i: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 766Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2015. Vol. 766
Emneord [en]
breakup/coalescence, multiphase and particle-laden flows, turbulent flows
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-161602DOI: 10.1017/jfm.2015.13ISI: 000349076900008Scopus ID: 2-s2.0-84946893826OAI: oai:DiVA.org:kth-161602DiVA, id: diva2:797996
Merknad

QC 20150325

Tilgjengelig fra: 2015-03-25 Laget: 2015-03-13 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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Bäbler, MatthäusBrandt, LucaSardina, Gaetano

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