Measurement of ambient fluid entrainment during laminar vortex ring formation View Full Text


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Article Info

DATE

2007-10-14

AUTHORS

Ali B. Olcay, Paul S. Krueger

ABSTRACT

Planar laser induced fluorescence (PLIF) and digital particle image velocimetry (DPIV) combined with Lagrangian coherent structure (LCS) techniques are utilized to measure ambient fluid entrainment during laminar vortex ring formation and relate it to the total entrained volume after formation is complete. Vortex rings are generated mechanically with a piston-cylinder mechanism for a jet Reynolds number of 1,000, stroke ratios of 0.5, 1.0 and 2.0, and three velocity programs (Trapezoidal, triangular negative and positive sloping velocity programs). The quantitative observations of PLIF agree with both the total ring volume and entrainment rate measurements obtained from the DPIV/LCS hybrid method for the jet Reynolds number of 1,000, trapezoidal velocity program and stroke ratio of 2.0 case. In addition to increased entrainment at smaller stroke ratios observed by others, the PLIF results also show that a velocity program utilizing rapid jet initiation and termination enhances ambient fluid entrainment. The observed trends in entrainment rate and final entrained fluid fraction are explained in terms of the vortex roll-up process during vortex ring formation. More... »

PAGES

235-247

References to SciGraph publications

  • 1997-05. The effect of a discrete window offset on the accuracy of cross-correlation analysis of digital PIV recordings in EXPERIMENTS IN FLUIDS
  • 1995. Fluid Vortices in NONE
  • 1980-09. Extinguishing gas and oil well fires by means of vortex rings in COMBUSTION, EXPLOSION, AND SHOCK WAVES
  • 1979-01. On the formation of vortex rings: Rolling-up and production of circulation in ZEITSCHRIFT FÜR ANGEWANDTE MATHEMATIK UND PHYSIK
  • 1991-01. Digital particle image velocimetry in EXPERIMENTS IN FLUIDS
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    http://scigraph.springernature.com/pub.10.1007/s00348-007-0397-9

    DOI

    http://dx.doi.org/10.1007/s00348-007-0397-9

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