A Study of the Vortical Structures of Noncircular Jets

Kuniaki Toyoda, Fazle Hussain

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


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 languageEnglish (US)
Pages (from-to)1542-1545
Number of pages4
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Issue number514
StatePublished - 1989


  • Coherent Structures
  • Flow Visualization
  • Jet
  • Turbulent Flow
  • Vortex

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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