Abstract
As a part of the laboratory experiment on an isolated microburst, the instantaneous velocity fields of an impulse-driven vortex ring impinging onto a normal wall were investigated. Vortex rings were visualized by filling ethylene glycol smoke. In this paper, as the sequel of the previous paper (Nagata et al., 2000), by employing PIV, the vertical cross-section of the velocity fields was reported. It was shown that the central downward flow as well as the entrainment above the vortex ring agrees qualitatively with numerical simulation of atmospheric microburst (Proctor, 1984). The roles of vortex ring in the velocity field of microburst was discussed. The time evolution of the total circulation in vertical cross section could be fitted to the theoretical equation for that of incompressible viscous vortex.
| Original language | English |
|---|---|
| Pages (from-to) | 733-739 |
| Number of pages | 7 |
| Journal | Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B |
| Volume | 68 |
| Issue number | 667 |
| DOIs | |
| Publication status | Published - 2002 Mar |
| Externally published | Yes |
Keywords
- Digital image processing
- Flow visualization
- Microburst
- PIV
- Velocity distribution
- Vortex ring
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanical Engineering