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The dynamics of finite-size settling particles

Doychev, Todor


This book contributes to the fundamental understanding of the physical mechanisms that take place in pseudo turbulent particulate flows. In the present work we have considered the sedimentation of large numbers of spherical rigid particles in an initially quiescent flow field. We have performed direct numerical simulations employing an immersed boundary method for the representation of the fluid-solid interface. The results evidence that depending on the particle settling regime (i.e.\ Galileo number and particle-to-fluid density ratio) the particles may exhibit strong inhomogeneous spatial distribution. It is found that the particles are preferentially located in regions with downward fluid motion. The particles inside clusters experience larger settling velocities than the average. The flow in all flow cases is observed to exhibit characteristic features of pseudo-turbulence. The particle-induced flow field is further found to be highly anisotropic with dominant vertical components. The results indicate that, in the present flow configurations, the collective and mobility effects play significant role for the particle and fluid motion.

Volltext §
DOI: 10.5445/KSP/1000044723
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Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hydromechanik (IFH)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Hochschulschrift
Publikationsjahr 2015
Sprache Englisch
Identifikator ISBN: 978-3-7315-0307-1
ISSN: 1439-4111
KITopen-ID: 1000044723
Verlag KIT Scientific Publishing
Umfang XIX, 238 S.
Serie Dissertationsreihe am Institut für Hydromechanik, Karlsruher Institut für Technologie / Karlsruher Institut für Technologie (KIT), Institut für Hydromechanik ; 2015,1
Art der Arbeit Dissertation
Fakultät Fakultät für Bauingenieur-, Geo- und Umweltwissenschaften (BGU)
Institut Institut für Hydromechanik (IFH)
Prüfungsdaten 09.05.2014
Schlagwörter Partikel-Strömung, Multiphasenströmungen, DNS, Immersed boundary, Suspensions, multiphase and particle-laden flows, DNS, immersed boundary method
Relationen in KITopen
Referent/Betreuer Uhlmann, M.
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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