Breakup Simulation using spray gun for spray painting processes - Studien-/Abschlussarbeit

Kennziffer IPA-2020-20

*Ausschreibung für die Fachrichtungen*

• Luft- und Raumfahrttechnik
• Maschinenbau
• Physik

Spray guns, such as HVLP-, airless and pneumatic guns are widely used in automated painting processes. Until now numerical studies on spray painting processes using spray guns have been focused mainly on the simulation of two phase flow (air and liquid droplets), the deposition of droplets, and the prediction of paint film thickness on sub-strates. The droplet size distributions used in the simulation were obtained through size distribution measurements by PDA or Malvern. The atomization of paint liquid plays an important role for the paint quality on substrates. However, there is few numerical study of breakup process.


Was Sie mitbringen

• Gute Lernfähigkeit 
• Grundwissen in der Strömungsmechanik und der nummerischen Simulation
• Grundwissen in Programmierungskenntnisse in C

Was Sie erwarten können
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Currently there is an ongoing AIF-Project about numerical study of disintegration of paint liquids by using atomizers in spray painting processes. Within the scope of these activities a Master/Bachelor thesis will be given. The primary goal is to carry out breakup simulation using a commercial spray gun. The CFD program ANSYS-Fluent is used in the investigations. The Large Eddy Simulation (LES) for turbulence flow and a new method, the so-called VOF-DPM for free-surface flows and discrete phase (particle phase) are applied. Simulations will be carried out in the High Performance Computer Center in Stuttgart (HLRS).
The work will be focused on:

• Creating a computational domain with high-quality hexahedral cells for breakup simulation. Examination of mesh independence should be carried out.
• Carry out primary breakup simulation using one or two set of operating condi-tions, i.e. liquid flow rate and shaping airflow rate.
• Viscosity model for shear thinning non Newtonian behavior will be used.
• Analysis of liquid-gas interface structures, namely primary breakup pattern, such as liquid ligaments close the gun, equivalent droplet diameter, droplet velocity, etc. 
• Comparing the droplet size distribution with measurement.

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Johannes Kienle
Recruiter
Tel.: 0711 970 1153

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Fraunhofer-Institut für Produktionstechnik und Automatisierung
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