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Erschienen in: Journal of Coatings Technology and Research 6/2019

13.06.2019

Primary breakup of a non-Newtonian liquid using a high-speed rotary bell atomizer for spray-painting processes

verfasst von: Bo Shen, Qiaoyan Ye, Nico Guettler, Oliver Tiedje, Joachim Domnick

Erschienen in: Journal of Coatings Technology and Research | Ausgabe 6/2019

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Abstract

The present contribution deals with numerical and experimental studies of the primary liquid breakup process using a high-speed rotary bell atomizer. The first part of the investigations focuses on the film formation on the distributor disk and the inner surface of the rotary bell. Numerical simulations using the volume-of-fluid approach were carried out. A non-Newtonian liquid that has shear-thinning behavior is used to investigate the effect of the viscosity on the initial wetting, the film formation process, and the film thickness distribution on the bell. A nonhomogeneous film structure is found on the inner surface of the rotary bell. This is also observed in experimental investigations using a high-speed camera. The second part focuses on the disintegration process of the paint liquid in the near bell region. As inlet conditions for the breakup simulations, the properties of the liquid film at the bell edge, i.e., film thickness, velocities, and apparent viscosity, resulting from the film formation simulations were applied. Two different liquid disintegrations in the near-field were found, which were also observed in experimental investigations using a high-speed camera. Furthermore, user-defined functions were compiled in ANSYS Fluent to uniquely identify and characterize droplets formed through the breakup process. In this way, droplet properties such as diameter, velocity, and position can be determined.

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Metadaten
Titel
Primary breakup of a non-Newtonian liquid using a high-speed rotary bell atomizer for spray-painting processes
verfasst von
Bo Shen
Qiaoyan Ye
Nico Guettler
Oliver Tiedje
Joachim Domnick
Publikationsdatum
13.06.2019
Verlag
Springer US
Erschienen in
Journal of Coatings Technology and Research / Ausgabe 6/2019
Print ISSN: 1547-0091
Elektronische ISSN: 1935-3804
DOI
https://doi.org/10.1007/s11998-019-00231-4

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