Study of Vortical Structures in a Cross-Shaped Jet

Kuniaki Toyoda, Fazle Hussain

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Vortical structures in a cross-shaped jet have been investigated, using a flow visualization technique by laser-fluorescent dye while controlling vortex evolutions under excitation. The corner regions of vortical structures close to the orifice undergo severe deformation due to the self-induced velocity; the outward corners become flat and the inward corners generate outward ejection. The excitation at low frequencies produces the large-scale vortical structures, the strong self-induced velocity switching over the normal and diagonal axes of the cross-shaped vortices. The deformed vortical structures are stretched under the effect of the mean flow, discharging small vortices from the tips of corners through the cut-and-connect mechanism. The vortex stretching and the splitting to small vortices in the cross-shaped vortical structures are expected to enhance mixing significantly.

Original languageEnglish
Pages (from-to)3205-3209
Number of pages5
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Volume55
Issue number518
DOIs
StatePublished - 1989

Keywords

  • Coherent Structure
  • Cross-shaped Orifice
  • Flow Visualization
  • Jet
  • Turbulent Flow
  • Vortex

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