Characterization of tab-induced counter-rotating vortex pair for mixing applications

Jeongmoon Park, Axy Pagan-Vazquez, Jorge L. Alvarado, Leonardo Patricio Chamorro Chavez, Scott M. Lux, Charles P. Marsh

Research output: Contribution to journalArticle

Abstract

An experimental and numerical investigation was carried out to explore the effects of four vortex generators (VG) on the onset of flow instabilities, the paths and characteristics of the induced coherent counter-rotating vortices at a Reynolds number Re ≈ 2000. The flow field around the VG was characterized using a smoke visualization technique and simulated numerically using Reynolds-averaged Navier-Stokes (RANS). The taper angle of the VG was varied based on the used tab geometries, including triangular, trapezoidal, and rectangular tabs, which shared the same height, inclination angle, and base width. The results reveal that each VG was able to generate a counter-rotating vortex pair (CVP), and that the taper angle has direct effects on the path of the CVP, the onset location of Kelvin-Helmholtz (K-H) instabilities, and the circulation strength of the vortex structures. Furthermore, a linear relation between VG taper angle and the onset of instability was observed experimentally. Before the onset of K-H instability, the path of the CVP in the wake of a VG can be predicted using a pseudo-viscous model, which was validated numerically and experimentally.

Original languageEnglish (US)
Article number031102
JournalJournal of Fluids Engineering, Transactions of the ASME
Volume139
Issue number3
DOIs
StatePublished - Mar 1 2017

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Vortex flow
Smoke
Flow fields
Reynolds number
Visualization
Geometry

ASJC Scopus subject areas

  • Mechanical Engineering

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Characterization of tab-induced counter-rotating vortex pair for mixing applications. / Park, Jeongmoon; Pagan-Vazquez, Axy; Alvarado, Jorge L.; Chamorro Chavez, Leonardo Patricio; Lux, Scott M.; Marsh, Charles P.

In: Journal of Fluids Engineering, Transactions of the ASME, Vol. 139, No. 3, 031102, 01.03.2017.

Research output: Contribution to journalArticle

Park, Jeongmoon ; Pagan-Vazquez, Axy ; Alvarado, Jorge L. ; Chamorro Chavez, Leonardo Patricio ; Lux, Scott M. ; Marsh, Charles P. / Characterization of tab-induced counter-rotating vortex pair for mixing applications. In: Journal of Fluids Engineering, Transactions of the ASME. 2017 ; Vol. 139, No. 3.
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