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Sonoluminescence and near self-similar spherically symmetric solutions of Navier-Stokes and Euler equations

Leonardo Pollini

Sonoluminescence and near self-similar spherically symmetric solutions of Navier-Stokes and Euler equations.

Rel. Daniela Tordella. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Aerospaziale, 2021

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Abstract:

Sonoluminescence is a phenomenon that occurs when a bubble is excited by a driving sound wave with resonant frequency. The implosion is so strong that the internal energy is spatially concentrated of about twelve orders of magnitude in a small volume of a radius in the order of 10e-6 meters. Concomitantly, emission of light is observed. A deep comprehension of this phenomenon is yet to be reached, because of the complex interaction between the bubble wall dynamics and the interior chemistry and hydrodynamics. In this work a comparison between the physical phenomenology and a recently found set of mathematical solutions to the spherically symmetric Navier-Stokes and Euler equations is conducted. The physical aspects are described through a classic Rayleigh-Plesset model for bubble dynamics, considering a polytropic behaviour inside the interface. The results show a good fit of the analytical solutions to the numerical data near the collapse, and three pairs of coefficients' values are estimated for the analytical solutions.

Relators: Daniela Tordella
Academic year: 2020/21
Publication type: Electronic
Number of Pages: 86
Subjects:
Corso di laurea: Corso di laurea magistrale in Ingegneria Aerospaziale
Classe di laurea: New organization > Master science > LM-20 - AEROSPATIAL AND ASTRONAUTIC ENGINEERING
Aziende collaboratrici: Massachusetts Institute of Technology
URI: http://webthesis.biblio.polito.it/id/eprint/18938
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