A spray painting simulation using high-speed rotary Atomizer—Model development and comparison of LES and RANS—

Yohsuke Matsushita, Tomoyuki Katayama, Yasuhiro Saito, Yoshiya Matsukawa, Takahiro Okabe, Minori Shirota, Takao Inamura, Masatoshi Daikoku, Junichi Fukuno, Hideyuki Aoki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study performed a spray-painting simulation based on the Large Eddy Simulation (LES) and Reynolds-Averaged Navier-Stokes (RANS) for spray painting using a rotary atomizer. The LES better reproduced the flow field and spray dispersion between the bell and target than the RANS. Also, the region called “over-spray” in the radially outside of the bell, in which the droplets stay, was formed, and the residence time became longer for droplets with larger diameter regardless of numerical methods for turbulent flow. Further, the transfer efficiency (TE) in the RANS was almost constant, independent of droplet diameter because all the eddy was modeled in the RANS, and the turbulent fluctuation a droplet received near the target was isotropic. In contrast, the TE in the LES varied depending on droplet diameter and showed the maximum value because only small eddies are modeled in the LES, and the turbulent fluctuation was more realistic.

Original languageEnglish
Article number101697
JournalResults in Engineering
Volume21
DOIs
Publication statusPublished - 2024 Mar

Keywords

  • Bell atomizer
  • Coating
  • High-speed rotary atomizer
  • Large eddy simulation
  • Reynolds-averaged Navier-Stokes equation
  • Transfer efficiency

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