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Shock waves generated by sudden expansions of a water jet

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Abstract

Direct shadowgraph with parallel light combined with high-speed recording has been used to analyze the water jet of a cutting machine. The use of image processing allowed observing sudden expansions in the jet diameter as well as estimating the jet velocity by means of the Mach angle, obtaining velocities of about \(500\,\hbox {m}\,\hbox {s}^{-1}\). The technique used here revealed the development of hydrodynamic instabilities in the jet. Additionally, this is the first reporting of the onset of shock waves generated by small fluctuations of a continuous flow of water at high velocity surrounded by air, a result confirmed by a transient computational fluid dynamics simulation.

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Acknowledgements

Special thanks to Juan Arenas for his technical support in operating the water jet cutting machine.

Funding

C. Echeverria and D. Porta thank the scholarship provided by the National Council of Sciences and Technology (CONACyT) and UNAM through Project PAPIIT IN117712.

Author information

Authors and Affiliations

  1. Instituto de Ingeniería, Universidad Nacional Autónoma de México (UNAM), Circuito Escolar, Ciudad Universitaria, 04510, Ciudad de México, Mexico

    M. Salinas-Vázquez & W. Vicente

  2. Facultad de Ciencias, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, Ciudad Universitaria, 04510, Ciudad de México, Mexico

    C. Echeverría, D. Porta & C. E. Stern

  3. Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior, Ciudad Universitaria, 04510, Ciudad de México, Mexico

    G. Ascanio & J. P. Aguayo

Authors
  1. M. Salinas-Vázquez
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  2. C. Echeverría
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  3. D. Porta
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  4. C. E. Stern
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  5. G. Ascanio
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  6. W. Vicente
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  7. J. P. Aguayo
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Corresponding author

Correspondence to J. P. Aguayo.

Additional information

Communicated by A. Higgins.

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Salinas-Vázquez, M., Echeverría, C., Porta, D. et al. Shock waves generated by sudden expansions of a water jet. Shock Waves 28, 933–937 (2018). https://doi.org/10.1007/s00193-017-0775-z

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  • DOI: https://doi.org/10.1007/s00193-017-0775-z

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