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A study on shape-dependent settling of single particles with equal volume using surface resolved simulations

Trunk, Robin; Bretl, Colin; Thäter, Gudrun; Nirschl, Hermann; Dorn, Márcio; Krause, Mathias J.

Abstract:
A detailed knowledge of the influence of a particle’s shape on its settling behavior is useful for the prediction and design of separation processes. Models in the available literature usually fit a given function to experimental data. In this work, a constructive and data-driven approach is presented to obtain new drag correlations. To date, the only considered shape parameters are derivatives of the axis lengths and the sphericity. This does not cover all relevant effects, since the process of settling for arbitrarily shaped particles is highly complex. This work extends the list of considered parameters by, e.g., convexity and roundness and evaluates the relevance of each. The aim is to find models describing the drag coefficient and settling velocity, based on this extended set of shape parameters. The data for the investigations are obtained by surface resolved simulations of superellipsoids, applying the homogenized lattice Boltzmann method. To closely study the influence of shape, the particles considered are equal in volume, and therefore cover a range of Reynolds numbers, limited to [9.64, 22.86]. Logistic and polynomial regressions are performed and the quality of the models is investigated with further statistical methods. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000131883
Veröffentlicht am 30.04.2021
Originalveröffentlichung
DOI: 10.3390/computation9040040
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Institut für Angewandte und Numerische Mathematik (IANM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2079-3197
KITopen-ID: 1000131883
Erschienen in Computation
Verlag MDPI
Band 9
Heft 4
Seiten Art.-Nr.: 40
Schlagwörter single particle settling; non-spherical; particle shape; OpenLB; lattice Boltzmann method; homogenised lattice Boltzmann method
Nachgewiesen in Scopus
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