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Spatial structure of the flow through an axisymmetric sudden expansion

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Abstract

Spatio-temporal velocity fields of an axisymmetric sudden expansion were measured using an ultrasonic velocity profiler and analyzed to investigate the transitional scheme of the spatial structure using two-dimensional Fourier transform and proper orthogonal decomposition techniques. The variation of the zero-crossing point, the fluctuation energy directed upstream and the eigenmode spectrum all have the same transitional scheme as a function of the Reynolds number. The transitional scheme can be classified Re d<1,000 for the laminar regime, Re d=1,000–3,000 for the transitional regime and Re d>3,000 for the turbulent regime. Especially, in the transitional regime, we found large changes in the flow structure at Re d=1,500 and 2,000. The jump at Re d=2,000 is caused by the change in the flow condition upstream. The jump at Re d=1,500 clearly shows a change in the spatial structure of the flow.

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Acknowledgement

The authors are grateful to Dr. G. King for his fruitful discussions and continuous encouragement.

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  1. Y. Takeda

    Present address: , Hokkaido University, Kita-13 Nishi-8, Kita-ku, 060-8628, Sapporo, Japan

Authors and Affiliations

  1. Department of Environmental and Renewable Energy Systems, Faculty of Engineering, Gifu University, 1-1 Yanagido, 501-1193, Gifu, Japan

    N. Furuichi & M. Kumada

  2. Paul Scherrer Institute, 5232, Villigen PSI, Switzerland

    Y. Takeda

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  1. N. Furuichi
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  2. Y. Takeda
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  3. M. Kumada
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Correspondence to N. Furuichi.

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Furuichi, N., Takeda, Y. & Kumada, M. Spatial structure of the flow through an axisymmetric sudden expansion. Exp Fluids 34, 643–650 (2003). https://doi.org/10.1007/s00348-003-0612-2

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  • DOI: https://doi.org/10.1007/s00348-003-0612-2

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