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Instantaneous Heating and Cooling Caused by Periodic or Aperiodic Sound of Any Characteristic Duration in a Gas with Vibrational Relaxation
Abstract
Thermodynamic relaxation of internal degrees of a molecule's freedom in a gas occurs with some characteristic time. This makes wave processes in a gas behave differently depending on the ratio of characteristic duration of perturbations and the relaxation time. In particular, generation of the secondary non-wave modes by intense sound in a nonlinear flow dependens on frequency. These kinds of interaction are considered in this study. The exact links between perturbations inside every type of a fluid's motion (modes) and resulting weakly nonlinear equations for interacting modes are derived. These equations are instantaneous and hence are valid for pulsed excitation. Some kind of energy inflow makes a gas with excited degrees of oscillatory molecule's freedom acoustically active. That leads to anomalous acoustic cooling of a gas. The impact of standard viscosity, thermal conductivity, and dependence of the power of energy inflow on temperature is briefly discussed.
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.3813/AAA.919089
- License
- Copyright (2017 S. Hirzel Verlag · EAA)
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
ACTA ACUSTICA UNITED WITH ACUSTICA
no. 103,
pages 607 - 615,
ISSN: 1610-1928 - Language:
- English
- Publication year:
- 2017
- Bibliographic description:
- Perelomova A.: Instantaneous Heating and Cooling Caused by Periodic or Aperiodic Sound of Any Characteristic Duration in a Gas with Vibrational Relaxation// ACTA ACUSTICA UNITED WITH ACUSTICA. -Vol. 103, nr. 4 (2017), s.607-615
- DOI:
- Digital Object Identifier (open in new tab) 10.3813/aaa.919089
- Verified by:
- Gdańsk University of Technology
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