Laboratoire de Mécanique des Fluides et d’Acoustique, Lyon, France
Fluid and Complex Systems Research Centre, Coventry, UK
Contact e-mails: sophie.miralles@insa-lyon.fr , valery.botton@insa-lyon.fr, alban.potherat@coventry.ac.uk
“Not only a jet can generate sound but also sound can generate a jet!” [1]; starting from this idea stated by Sir J. Lighthill, our research team in Lyon has developed theoretical, numerical and experimental skills to observe and model liquid flows generated by ultrasounds. Among several applications, an ultimate goal is the stirring of liquid semi-conductors and metallic alloys or semi-conductors during their solidification; the present study is in the framework of the BRASSOA project working out key points for this issue. Such a way of stirring is for instance of interest in Aluminium alloys industry and in Photovoltaic silicon production processes, which both involve high working temperatures (respectively about 600 °C and 1400 °C). Scaling laws, similarity laws and technical solutions concerning acoustic streaming in liquid metals have already been developed by the international academic and industrial research community [3, 4] and in particular by our team.
A key ingredient in the generation of acoustic streaming flows is the attenuation of sound in the medium, which is responsible for the conversion of acoustic energy into momentum and increases significantly with the ultrasounds frequency. A common strategy is to use rather low frequencies and high acoustic powers to create a cavitation cloud which significantly increases attenuation, but has the major drawback to break down the acoustic beam coherence. We are most interested in investigating high frequencies and rather low acoustic powers avoiding cavitation regimes, which has been poorly investigated yet.
… more about : PhD_LMFACoventry2022
Visualization of the transient acoustic streaming jet generated with a transducer
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