Ambient gas entrainment into a transient gas jet: (Visualization of surrounding air motion and estimation of entrainment amount by path line method)

Eiji Tomita, Yoshisuke Hamamoto, Hiroyuki Tsutsumi, Shiro Takasaki

Research output: Contribution to journalArticle

1 Citation (Scopus)


For the study of the combustion in a transient gas jet used in gas diesel engines, it is very important to investigate the entrainment process of the surroundings of the jet. In this study, a path line method utilizing a CCD random shutter camera with various shutter times was applied. Large (40 μm), lightweight microballoon particles are used for scattering the path lines of the surroundings and fine particles (0.75 μm) are used for visualizing the approximate shape of the jet. The transient gas velocity was also measured with a two-component laser Doppler velocimeter (LDV). Consequently, (1) the jet configuration and the entrainment process could be visualized simultaneously, and (2) this path line method was found to be very useful for estimating the air mass entrained because of the good agreement with the values obtained using LDV.

Original languageEnglish
Pages (from-to)546-553
Number of pages8
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Issue number3
Publication statusPublished - Aug 1996



  • Entrainment
  • Flow Visualization
  • Jet
  • LDA
  • LDV
  • Path Line Method
  • TransiEnt Gas Jet
  • Unsteady Flow

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

Cite this