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Coatings 2017, 7(1), 13; doi:10.3390/coatings7010013

Numerical and Experimental Investigation on the Spray Coating Process Using a Pneumatic Atomizer: Influences of Operating Conditions and Target Geometries

Fraunhofer Institute for Manufacturing Engineering and Automation, Nobelstr. 12, Stuttgart 70569, Germany
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Academic Editor: Robert B. Heimann
Received: 1 December 2016 / Revised: 28 December 2016 / Accepted: 5 January 2017 / Published: 18 January 2017
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Abstract

This paper presents a numerical simulation of the spray painting process using a pneumatic atomizer with the help of a computational fluid dynamics code. The droplet characteristics that are necessary for the droplet trajectory calculation were experimentally investigated using different shaping air flow rates. It was found that the droplet size distribution depends on both the atomizing and the shaping air flow rate. An injection model for creating the initial droplet conditions is necessary for the spray painting simulation. An approach for creating these initial conditions has been proposed, which takes different operating conditions into account and is suitable for practical applications of spray coating simulation using spray guns. Further, tests on complicated targets and complex alignments of the atomizer have been carried out to verify this numerical approach. The results confirm the applicability and reliability of the chosen method for the painting process. View Full-Text
Keywords: spray coating simulation; pneumatic atomizer; droplet size; film thickness distribution; particle injection model; 3D-target geometry spray coating simulation; pneumatic atomizer; droplet size; film thickness distribution; particle injection model; 3D-target geometry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ye, Q.; Pulli, K. Numerical and Experimental Investigation on the Spray Coating Process Using a Pneumatic Atomizer: Influences of Operating Conditions and Target Geometries. Coatings 2017, 7, 13.

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