Impact of Boundary Conditions on Acoustic Excitation of Entropy Perturbations in a Bounded Volume of Newtonian Gas
Excitation of the entropy mode in the field of intense sound, that is, acoustic heating, is theoretically considered 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...
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Institute of Fundamental Technological Research Polish Academy of Sciences
2019-04-01
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| Series: | Archives of Acoustics |
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| Online Access: | https://acoustics.ippt.pan.pl/index.php/aa/article/view/2413 |
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| author | Anna PERELOMOVA |
| author_facet | Anna PERELOMOVA |
| author_sort | Anna PERELOMOVA |
| collection | DOAJ |
| description | Excitation of the entropy mode in the field of intense sound, that is, acoustic heating, is theoretically considered 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 with an acoustic driving force which is quadratically nonlinear in the leading order. The diffusion coefficient is proportional 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 impulsive sounds. Acoustic heating in a half-space and in a planar resonator is discussed. The aim of this study is to evaluate acoustic heating and determine the contribution of thermal conduction and mechanical viscosity in different boundary problems. The conclusions are drawn for the Dirichlet and Neumann boundary conditions. The instantaneous dynamic equation for variations in temperature, which specifies the entropy mode, is solved analytically for some types of acoustic exciters. The results show variation in temperature as a function of time and distance from the boundary for different boundary conditions. |
| format | Article |
| id | doaj-art-4c4b78e5b72741c58b6b48cd35659b2b |
| institution | Kabale University |
| issn | 0137-5075 2300-262X |
| language | English |
| publishDate | 2019-04-01 |
| publisher | Institute of Fundamental Technological Research Polish Academy of Sciences |
| record_format | Article |
| series | Archives of Acoustics |
| spelling | doaj-art-4c4b78e5b72741c58b6b48cd35659b2b2025-08-20T03:58:23ZengInstitute of Fundamental Technological Research Polish Academy of SciencesArchives of Acoustics0137-50752300-262X2019-04-0144210.24425/aoa.2019.128495Impact of Boundary Conditions on Acoustic Excitation of Entropy Perturbations in a Bounded Volume of Newtonian GasAnna PERELOMOVA0Technical University of GdanskExcitation of the entropy mode in the field of intense sound, that is, acoustic heating, is theoretically considered 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 with an acoustic driving force which is quadratically nonlinear in the leading order. The diffusion coefficient is proportional 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 impulsive sounds. Acoustic heating in a half-space and in a planar resonator is discussed. The aim of this study is to evaluate acoustic heating and determine the contribution of thermal conduction and mechanical viscosity in different boundary problems. The conclusions are drawn for the Dirichlet and Neumann boundary conditions. The instantaneous dynamic equation for variations in temperature, which specifies the entropy mode, is solved analytically for some types of acoustic exciters. The results show variation in temperature as a function of time and distance from the boundary for different boundary conditions.https://acoustics.ippt.pan.pl/index.php/aa/article/view/2413nonlinear acousticsacoustic heating in resonatorsBurgers equationfirst and second type boundary conditionsacoustic heating in a half-space |
| spellingShingle | Anna PERELOMOVA Impact of Boundary Conditions on Acoustic Excitation of Entropy Perturbations in a Bounded Volume of Newtonian Gas Archives of Acoustics nonlinear acoustics acoustic heating in resonators Burgers equation first and second type boundary conditions acoustic heating in a half-space |
| title | Impact of Boundary Conditions on Acoustic Excitation of Entropy Perturbations in a Bounded Volume of Newtonian Gas |
| title_full | Impact of Boundary Conditions on Acoustic Excitation of Entropy Perturbations in a Bounded Volume of Newtonian Gas |
| title_fullStr | Impact of Boundary Conditions on Acoustic Excitation of Entropy Perturbations in a Bounded Volume of Newtonian Gas |
| title_full_unstemmed | Impact of Boundary Conditions on Acoustic Excitation of Entropy Perturbations in a Bounded Volume of Newtonian Gas |
| title_short | Impact of Boundary Conditions on Acoustic Excitation of Entropy Perturbations in a Bounded Volume of Newtonian Gas |
| title_sort | impact of boundary conditions on acoustic excitation of entropy perturbations in a bounded volume of newtonian gas |
| topic | nonlinear acoustics acoustic heating in resonators Burgers equation first and second type boundary conditions acoustic heating in a half-space |
| url | https://acoustics.ippt.pan.pl/index.php/aa/article/view/2413 |
| work_keys_str_mv | AT annaperelomova impactofboundaryconditionsonacousticexcitationofentropyperturbationsinaboundedvolumeofnewtoniangas |