Abstract
Noncircular jets issuing from square, triangular and rectangular orifices are investigated using a flow visualization technique employing laser-fluorescent dye, and controlling vortex evolutions under excitation. In square, triangular, and 2:1 rectangular jets, the corner regions of noncircular vortical structures undergo severe deformation due to self-induced velocity, resulting in the switchover of the geometric axes. The deformation of vortices in a 4:1 rectangular jet is so severe that the major-axis sides come close to each other, collide, and crosslink, and the original single vortex ring bifurcates to two small vortices via the so-called cut-and-connect process. Interactions of two noncircular vortices are affected by self- and mutually-induced velocities, and produce partial merging, vortex stretching, and splitting to small vortices.
Original language | English (US) |
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Pages (from-to) | 1542-1545 |
Number of pages | 4 |
Journal | Transactions of the Japan Society of Mechanical Engineers Series B |
Volume | 55 |
Issue number | 514 |
DOIs | |
State | Published - 1989 |
Keywords
- Coherent Structures
- Flow Visualization
- Jet
- Turbulent Flow
- Vortex
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanical Engineering