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Measurement of ambient fluid entrainment during laminar vortex ring formation

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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.

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Acknowledgments

This material is based upon work supported by the National Science Foundation under Grant No. 0347958.

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Authors and Affiliations

  1. Department of General Engineering, University of Wisconsin-Platteville, 1 University Plaza, Platteville, WI, 53818, USA

    Ali B. Olcay

  2. Department of Mechanical Engineering, Southern Methodist University, P.O. Box 750337, Dallas, TX, 75275, USA

    Paul S. Krueger

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  1. Ali B. Olcay
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  2. Paul S. Krueger
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Correspondence to Paul S. Krueger.

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Olcay, A.B., Krueger, P.S. Measurement of ambient fluid entrainment during laminar vortex ring formation. Exp Fluids 44, 235–247 (2008). https://doi.org/10.1007/s00348-007-0397-9

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  • DOI: https://doi.org/10.1007/s00348-007-0397-9

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