Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/33943
Title: Quantification of cavitating flows with neutron imaging
Authors: Karathanassis, Ioannis K. 
Heidari-Koochi, M. 
Koukouvinis, Foivos (Phoevos) 
Weiss, L. 
Trtik, P. 
Spivey, D. 
Wensing, M. 
Gavaises, M. 
Major Field of Science: Engineering and Technology
Field Category: Mechanical Engineering
Keywords: Viscoelasticity;Irradiation imaging;Microfluidics;Phase change;Two-phase flows
Issue Date: 6-Nov-2024
Source: Scientific reports, 2024, vol. 14, Article number: 26911
Volume: 14
Journal: Scientific Reports 
Abstract: The current experimental investigation demonstrates the capability of neutron imaging to quantify cavitation, in terms of vapour content, within an orifice of an abruptly constricting geometry. The morphology of different cavitation regimes setting in was properly visualised owing to the high spatial resolution of 16 μm achieved, given the extensive field of view of 12.9 × 12.9 mm2 offered by the imaging set-up. At a second step, the method was proven capable of highlighting subtle differences between fluids of different rheological properties. More specifically, a reference liquid was comparatively assessed against a counterpart additised with a Quaternary Ammonium Salt (QAS) agent, thus obtaining a viscoelastic behaviour. In accordance with previous studies, it was verified, yet in a quantifiable manner, that the presence of viscoelastic additives affects the overall cavitation topology by promoting the formation of more localised vortical cavities rather than cloud-like structures occupying a larger portion of the orifice core. To the authors' best knowledge, the present work is the first to demonstrate that neutron imaging is suitable for quantifying in-nozzle cavitating flow at the micrometre level, consequently elucidating the distinct forms of vaporous structures that arise. The potential of incorporating neutron irradiation for the quantification of two-phase flows in metallic microfluidics devices has been established.
URI: https://hdl.handle.net/20.500.14279/33943
ISSN: 20452322
DOI: 10.1038/s41598-024-76588-3
Type: Article
Affiliation : City, University of London 
Friedrich-Alexander-Universität Erlangen-Nürnberg 
Paul Scherrer Institute (PSI) 
Lubrizol European Research and Development Centre 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

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