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Effects of jet velocity profiles on a round jet in cross-flow

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Abstract

This paper reports the results of an experimental investigation on the effects of jet velocity profiles on the flow field of a round jet in cross-flow (JICF) using laser-induced fluorescence and digital particle-image velocimetry techniques (DPIV). Tophat and parabolic jets were considered, with the momentum ratios (MRs) ranging from 2.3 to 5.8. Results show that the thicker shear layer associated with a parabolic JICF is able to delay the formation of leading-edge and lee-side vortices when compared to the tophat JICF at the corresponding MR. As a result, there is an increase in jet penetration and a reduction in the near-field entrainment of cross-flow fluid by a parabolic JICF. Also, the less coherent nature of the leading-edge and lee-side vortices in a parabolic JICF is more likely to break up sporadically into smaller-scaled vortices. In addition, DPIV results show that a parabolic JICF exhibits not only a faster velocity recovery of cross-flow fluid at the jet lee-side than the corresponding tophat JICF, it also consistently registers a higher magnitude of the peak average vorticity than the tophat JICF for all MR considered. Despite these differences, the time-averaged flow topology for both cases share many salient features.

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Acknowledgements

The authors gratefully acknowledge the financial support by the National University of Singapore under Research Grant No: RP950638.

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  1. T. H. New

    Present address: Department of Engineering, University of Liverpool, Brownlow Hill, L69 3GH, Liverpool, UK

Authors and Affiliations

  1. Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore, Singapore

    T. H. New, T. T. Lim & S. C. Luo

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  1. T. H. New
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  2. T. T. Lim
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  3. S. C. Luo
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Correspondence to T. H. New.

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New, T.H., Lim, T.T. & Luo, S.C. Effects of jet velocity profiles on a round jet in cross-flow. Exp Fluids 40, 859–875 (2006). https://doi.org/10.1007/s00348-006-0124-y

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  • DOI: https://doi.org/10.1007/s00348-006-0124-y

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