Spatially-resolved velocities of thermally-produced spray droplets using a velocity-divided Abel inversion of photographed streaks

Y. Kawaguchi, N. Kobayashi, Yukihiko Yamagata, F. Miyazaki, M. Yamasaki, K. Muraoka

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Droplet velocities of thermal spray are known to have profound effects on important coating qualities, such as adhesive strength, porosity, and hardness, for various applications. For obtaining the droplet velocities, therefore, the TOF (time-of-flight) technique has been widely used, which relies on observations of emitted radiation from the droplets, where all droplets along the line-of-sight contribute to signals. Because droplets at and near the flow axis mostly contribute coating layers, it has been hoped to get spatially resolved velocities. For this purpose, a velocity-divided Abel inversion was devised from CMOS photographic data. From this result, it has turned out that the central velocity is about 25% higher than that obtained from the TOF technique for the case studied (at the position 150 mm downstream of the plasma spray gun, where substrates for spray coatings are usually placed). Further implications of the obtained results are discussed.

Original languageEnglish
Article number425203
JournalJournal of Physics D: Applied Physics
Volume50
Issue number42
DOIs
Publication statusPublished - Sep 22 2017

Fingerprint

sprayers
inversions
coatings
Coatings
Spray guns
adhesives
line of sight
Adhesives
CMOS
hardness
Porosity
Hardness
porosity
Plasmas
Radiation
Substrates
radiation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Spatially-resolved velocities of thermally-produced spray droplets using a velocity-divided Abel inversion of photographed streaks. / Kawaguchi, Y.; Kobayashi, N.; Yamagata, Yukihiko; Miyazaki, F.; Yamasaki, M.; Muraoka, K.

In: Journal of Physics D: Applied Physics, Vol. 50, No. 42, 425203, 22.09.2017.

Research output: Contribution to journalArticle

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AU - Yamasaki, M.

AU - Muraoka, K.

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