Experiments in Fluids

, Volume 48, Issue 3, pp 409–420 | Cite as

Volumetric velocity measurements of vortex rings from inclined exits

  • Daniel R. TroolinEmail author
  • Ellen K. Longmire
Research Article


Vortex rings were generated by driving pistons within circular cylinders of inner diameter D = 72.8 mm at a constant velocity U 0 over a distance L = D. The Reynolds number, U 0 L/(2ν), was 2500. The flow downstream of circular and inclined exits was examined using volumetric 3-component velocimetry (V3V). The circular exit yields a standard primary vortex ring that propagates downstream at a constant velocity and a lingering trailing ring of opposite sign associated with the stopping of the piston. By contrast, the inclined nozzle yields a much more complicated structure. The data suggest that a tilted primary vortex ring interacts with two trailing rings; one associated with the stopping of the piston, and the other associated with the asymmetry of the cylinder exit. The two trailing ring structures, which initially have circulation of opposite sign, intertwine and are distorted and drawn through the center of the primary ring. This behavior was observed for two inclination angles. Increased inclination was associated with stronger interactions between the primary and trailing vortices as well as earlier breakdown.


Vortex Vorticity Particle Image Velocimetry Vortex Ring Vortical Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Supplementary material

348_2009_745_MOESM1_ESM.wmv (219 kb)
Supplementary material 1 (WMV 219 kb)

Supplementary material 2 (WMV 287 kb)

Supplementary material 3 (WMV 380 kb)

Supplementary material 4 (WMV 291 kb)

Supplementary material 5 (WMV 366 kb)


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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.Fluid Mechanics DivisionTSI IncorporatedSt. PaulUSA
  2. 2.Department of Aerospace Engineering & MechanicsUniversity of MinnesotaMinneapolisUSA

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