Abstract
The aim of this chapter is to simulate processes of liquid droplet formation and atomization in a typical automotive paint spray system with scale modeling technique. In a spray painting process, paint is sprayed by a bell sprayer cup rotating at high speed to create fine atomized paint particles. The bell sprayers typically rotate at a speed of 30,000 rpm and have liquid (paint) flowing from the center with a flow rate of 300 cc/min. Due to the centrifugal action of the rotation, the liquid flows to the exterior of the bell, where they pass through grooves leading to the formation of ligaments and henceforth droplets due to shear forces acting against the surface tension forces. We designed different types of scale models to simulate the process.
Keywords
- Scale model
- Bell sprayer
- Pi-numbers
- Tread surface
- Instability analysis
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- F:
-
Force
- G:
-
Gravitational acceleration
- H:
-
Height of tread
- h:
-
Film layer thickness
- L:
-
Characteristic length
- m:
-
Mass
- Q:
-
Flow rate
- r:
-
Radius of spray cup
- t:
-
Time
- α:
-
Inclination angle
- Δ:
-
Change
- μ:
-
Dynamic viscosity
- ν:
-
Kinematic viscosity
- π:
-
Pi number
- ω:
-
Angular velocity
- ρ:
-
Density
- σ:
-
Surface Tension
- c:
-
Centrifugal force
- g:
-
Gravitational force
- I:
-
Inertial force
- M:
-
Model
- P:
-
Prototype
- ′:
-
Model
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© 2013 Springer Science+Business Media Dordrecht
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Srinivasan, V., Salazar, A.J., Saito, K. (2013). The Use of Scale Model to Study Film Flow in a Rotary Atomizer Cup. In: Toda, K., Salazar, A., Saito, K. (eds) Automotive Painting Technology. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5095-1_4
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DOI: https://doi.org/10.1007/978-94-007-5095-1_4
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Online ISBN: 978-94-007-5095-1
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