Stationary shock waves in nonequilibrium media

Makaryan, V. G.; Molevich, N. E.

doi:10.1088/0963-0252/16/1/017

Cited by 26 publications

(15 citation statements)

References 20 publications

(32 reference statements)

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“…(12)), but the non-wave part of the total density, ρ , enlarges. Newtonian attenuation may prevent anomalous attenuation of sound during weakly non-equilibrium processes in a medium [7,8]. An efficiency of heating (or cooling) of a medium depends strongly on the shape of a signal.…”

Section: Discussionmentioning

confidence: 99%

“…may be positive (under some conditions) [8,9] in a non-equilibrium gas, and negative in an equilibrium one [7,8,10]. It is the quantity evaluated at unperturbed 0 , T 0 , and C = ε / T .…”

Section: Gases With Excited Vibrational Degrees Of Molecule's Freedommentioning

confidence: 99%

“…A fluid may reveal anomalous absorption and dispersion of sound [4][5][6][7]. Some special conditions of external pumping of energy [8][9][10] or heat release in a chemical reaction [11] make a fluid non-equilibrium, negative dispersive and acoustically active. Anomalous dispersion of sound and negative total viscosity in these two examples of gases are caused by dif- * E-mail: anpe@mif.pg.gda.pl ferent physical reasons but described by similar equations with a certain generic coefficient which is responsible for dispersion in these fluids, ordinary or anomalous.…”

Section: Introductionmentioning

confidence: 99%

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Hysteresis curves and loops for harmonic and impulse perturbations in some non-equilibrium gases

Perelomova

2013

Open Physics

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Abstract:Evolution of sound in a relaxing gas whose properties vary in the course of wave propagation, is studied. A relaxing medium may reveal normal acoustic properties or be acoustically active. In the first case, losses in acoustic energy lead to an increase in internal energy of a gas similarly as it happens in Newtonian fluids. In the second case, acoustic energy increases in the course of sound propagation, and the internal energy of a medium decreases. Variations in the internal energy of a gas are proportional to some generic parameter, the sign of which is responsible for acoustical activity, and depends on intensity and shape of the sound waveform. Hysteresis curves in the plane of thermodynamic states are plotted. Curves for harmonic and several aperiodic sound impulses are plotted, discussed and compared. PACS

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Section: Discussionmentioning

confidence: 99%

“…may be positive (under some conditions) [8,9] in a non-equilibrium gas, and negative in an equilibrium one [7,8,10]. It is the quantity evaluated at unperturbed 0 , T 0 , and C = ε / T .…”

Section: Gases With Excited Vibrational Degrees Of Molecule's Freedommentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hysteresis curves and loops for harmonic and impulse perturbations in some non-equilibrium gases

Perelomova

2013

Open Physics

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“…The flow is supposed to be one-dimensional along axis Ox. Following Molevich and Makaryan (Molevich, 2003;2004;Makaryan, Molevich, 2007), we consider weak transversal pumping which may alter the background quantities in the transversal direction of axis Ox. It is assumed that the background stationary quantities are constant along axis Ox.…”

Section: Fundamentals Of Modes' Designation and Derivation Of Dynamicmentioning

confidence: 99%

Features of Nonlinear Sound Propagation in Vibrationally Excited Gases

Perelomova¹,

Kusmirek²

2013

Archives of Acoustics

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Weakly nonlinear sound propagation in a gas where molecular vibrational relaxation takes place is studied. New equations which govern the sound in media where the irreversible relaxation may take place are derived and discussed. Their form depends on the regime of excitation of oscillatory degrees of freedom, equilibrium (reversible) or non-equilibrium (irreversible), and on the comparative frequency of the sound in relation to the inverse time of relaxation. Additional nonlinear terms increase standard nonlinearity of the high-frequency sound in the equilibrium regime of vibrational excitation and decrease otherwise. As for the nonlinearity of the low-frequency sound, the conclusions are opposite. Appearance of a non-oscillating additional part which is a linear function of the distance from the transducer is an unusual property of nonlinear distortions of harmonic at the transducer high-frequency sound.

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“…In the last decades, the interest to the nonNewtonian fluids and media with irreversible thermodynamic processes constantly grows (Chu, 1970;Parker, 1972;Makaryan, Molevich, 2007). The non-equilibrium molecular physics began to develop quickly due to the laser revolution in physics and chemistry (Osipov, Uvarov, 1992;Clarke, McChesney, 1976).…”

Section: Introductionmentioning

confidence: 99%

Standing Waves in a Rectangular Resonator Containing Acoustically Active Gases

Perelomova

2016

Archives of Acoustics

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The distribution of perturbations of pressure and velocity in a rectangular resonator is considered. A resonator contains a gas where thermodynamic processes take place, such as exothermic chemical reaction or excitation of vibrational degrees of a molecule's freedom. These processes make the gas acoustically active under some conditions. We conclude that the incident and reflected compounds of a sound beam do not interact in the leading order in the case of the periodic sound with zero mean pressure including waveforms with discontinuities. The acoustic field before and after forming of discontinuities is described. The acoustic heating or cooling in a resonator is discussed.

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Stationary shock waves in nonequilibrium media

Abstract: Shock adiabats and exact stationary solutions of non-viscous one-dimensional gas dynamic equation for a gas with sustained steady-state nonequilibrium are constructed. Shock waves and a solitary pulse are investigated in negative-dispersion nonequilibrium media.

Cited by 26 publications

References 20 publications

Hysteresis curves and loops for harmonic and impulse perturbations in some non-equilibrium gases

Hysteresis curves and loops for harmonic and impulse perturbations in some non-equilibrium gases

Features of Nonlinear Sound Propagation in Vibrationally Excited Gases

Standing Waves in a Rectangular Resonator Containing Acoustically Active Gases

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