Shock waves generated by sudden expansions of a water jet

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 velo...

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Bibliographic Details
Published in:Shock waves 2018-07, Vol.28 (4), p.933-937
Main Authors: Salinas-Vázquez, M., Echeverría, C., Porta, D., Stern, C. E., Ascanio, G., Vicente, W., Aguayo, J. P.
Format: Article
Language:English
Subjects:
Acoustics
Aerodynamics
Computational fluid dynamics
Computer simulation
Condensed Matter Physics
Continuous flow
Cutting equipment
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Fluid- and Aerodynamics
Heat and Mass Transfer
Hydraulic jets
Image processing
Machine tools
Shock waves
Technical Note
Thermodynamics
Variations
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Summary: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 m 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.
ISSN:0938-1287
1432-2153
DOI:10.1007/s00193-017-0775-z