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Dimensional analysis of droplet size and ligament length during high-speed rotary bell atomization

Gödeke, Lutz; Oswald, Walter; Willenbacher, Norbert; Ehrhard, Peter

Abstract:
Modern spray-coating processes are based on high-volume, low-pressure, airless atomization or high-speed rotary bell atomization, often assisted by electrostatic charging to increase the transfer efficiency. The process from the liquid film flow beneath the bell, through ligament formation and consecutive disintegration to droplet deposition, has been constantly explored during the evolution of automotive spray coating. This work proposes a set of dimensionless groups that fully describe the process from film flow to ligament disintegration, including shear and elongational flow effects during atomization of particle laden, shear thinning, viscoelastic fluids.

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Verlagsausgabe §
DOI: 10.5445/IR/1000125533
Veröffentlicht am 30.10.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1547-0091, 1935-3804
KITopen-ID: 1000125533
Erschienen in Journal of coatings technology and research
Vorab online veröffentlicht am 01.10.2020
Schlagwörter Dimensional analysis, High-speed rotary bell atomization, Elongational flow, Ligament disintegration, Droplet size, Acrylic thickener, Plate-like particles
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