Air-bubble entrapment due to a drop

Nao Ootsuka*, T. Goji Etoh, Kohsei Takehara, Sachio Oki, Yasuhide Takano, Yuya Hatsuki, Sigurdur Thoroddsen

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


In 2001, an ultra-high-speed video camera of 1,000,000 frames per second was developed in Hydraulics Laboratory of Kinki University. The image sensor of the camera was the ISIS-V2, the In-situ Storage Image Sensor-Version 2. The camera has been applied to visualization of high-speed phenomena in various fields of science and engineering. We observed entrapment phenomena of bubbles resulting from thermal spraying of metals. Thermal spraying is used to improve solid surfaces by spraying melted metal or ceramic particles to the surfaces. One of the problems relating to the thermal spraying is entrapment of air bubbles under the metal or ceramic layers covering the solid surfaces. The bubbles decrease bonding strength of the layers made by the thermal spraying. The entrapment processes were successfully visualized by application of the ultra-high-speed video camera.

Original languageEnglish (US)
Article number20
Pages (from-to)153-162
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2005
Externally publishedYes
Event26th International Congress on High-Speed Photography and Photonics - Alexandria, VA, United States
Duration: Sep 20 2004Sep 24 2004


  • Air-entrapment processes
  • High-speed-imaging
  • ISIS-V2
  • Thermal spraying

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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