Impact of Boundary Conditions on Acoustic Excitation of EntropyPerturbations in a Bounded Volume of Newtonian Gas - Publikacja - MOST Wiedzy

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Impact of Boundary Conditions on Acoustic Excitation of EntropyPerturbations in a Bounded Volume of Newtonian Gas

Abstrakt

Excitation of the entropy mode in the field of intense sound, that is, acoustic heating, is theoreticallyconsidered in this work. The dynamic equation for an excess density which specifies the entropy mode,has been obtained by means of the method of projections. It takes the form of the diffusion equation withan acoustic driving force which is quadratically nonlinear in the leading order. The diffusion coefficient isproportional to the thermal conduction, and the acoustic force is proportional to the total attenuation.Theoretical description of instantaneous heating allows to take into account aperiodic and impulsivesounds. Acoustic heating in a half-space and in a planar resonator is discussed. The aim of this studyis to evaluate acoustic heating and determine the contribution of thermal conduction and mechanicalviscosity in different boundary problems. The conclusions are drawn for the Dirichlet and Neumannboundary conditions. The instantaneous dynamic equation for variations in temperature, which specifiesthe entropy mode, is solved analytically for some types of acoustic exciters. The results show variationin temperature as a function of time and distance from the boundary for different boundary conditions.Keywords:nonlinear acoustics; acoustic heating in resonators; Burgers equation; first and second typeboundary conditions; acoustic heating in a half-space

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
Archives of Acoustics nr 44, strony 321 - 328,
ISSN: 0137-5075
Język:
angielski
Rok wydania:
2019
Opis bibliograficzny:
Perelomova A.: Impact of Boundary Conditions on Acoustic Excitation of EntropyPerturbations in a Bounded Volume of Newtonian Gas// Archives of Acoustics. -Vol. 44, iss. 2 (2019), s.321-328
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.24425/aoa2019.128495
Weryfikacja:
Politechnika Gdańska

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