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Jetting bubbles observed by x-ray holography at a free-electron laser : internal structure and the effect of non-axisymmetric boundary conditions
ID Rosselló, Juan Manuel (Author), et al.

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Abstract
In this work, we study the jetting dynamics of individual cavitation bubbles using x-ray holographic imaging and high-speed optical shadowgraphy. The bubbles are induced by a focused infrared laser pulse in water near the surface of a flat, circular glass plate, and later probed with ultrashort x-ray pulses produced by an x-ray free-electron laser (XFEL). The holographic imaging can reveal essential information of the bubble interior that would otherwise not be accessible in the optical regime due to obscuration or diffraction. The influence of asymmetric boundary conditions on the jet’s characteristics is analysed for cases where the axial symmetry is perturbed and curved liquid filaments can form inside the cavity. The x-ray images demonstrate that when oblique jets impact the rigid boundary, they produce a non-axisymmetric splash which grows from a moving stagnation point. Additionally, the images reveal the formation of complex gas/liquid structures inside the jetting bubbles that are invisible to standard optical microscopy. The experimental results are analysed with the assistance of full three-dimensional numerical simulations of the Navier–Stokes equations in their compressible formulation, which allow a deeper understanding of the distinctive features observed in the x-ray holographic images. In particular, the effects of varying the dimensionless stand-off distances measured from the initial bubble location to the surface of the solid plate and also to its nearest edge are addressed using both experiments and simulations. A relation between the jet tilting angle and the dimensionless bubble position asymmetry is derived. The present study provides new insights into bubble jetting and demonstrates the potential of x-ray holography for future investigations in this field.

Language:English
Keywords:x-ray holography, bubble jetting, OpenFOAM simulations
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2024
Number of pages:26 str.
Numbering:Vol. 65, iss. 2, art. 20
PID:20.500.12556/RUL-156142 This link opens in a new window
UDC:532.528:004.94
ISSN on article:0723-4864
DOI:10.1007/s00348-023-03759-9 This link opens in a new window
COBISS.SI-ID:183556099 This link opens in a new window
Publication date in RUL:10.05.2024
Views:84
Downloads:4
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Record is a part of a journal

Title:Experiments in fluids
Shortened title:Exp. fluids
Publisher:Springer Nature
ISSN:0723-4864
COBISS.SI-ID:7427589 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:rentgenska holografija, brizganje mehurčkov, simulacije OpenFOAM

Projects

Funder:Other - Other funder or multiple funders
Funding programme:BMBF
Project number:05K22MG2

Funder:Other - Other funder or multiple funders
Funding programme:BMBF
Project number:05K16MGB

Funder:Other - Other funder or multiple funders
Funding programme:German Research Foundation (DFG)
Project number:ME 1645/8-3

Funder:FWF - Austrian Science Fund
Project number:I 5349-N

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