Effect of the phase transformations on acoustics of a mixture of gas with vapor, droplets, and solid particles

Gubaidullin, D. A.; Nikiforov, A. A.; Utkina, E. A.

doi:10.1134/s0018151x11060125

Cited by 20 publications

(4 citation statements)

References 7 publications

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“…The analysis of the research results of the move ment processes of two phase gas-and vapor-liquid flows in channels and their streamline motion around surfaces of different physical nature, for example, [1][2][3][4][5][6], shows that, in recent years, solutions have been obtained for quite interesting and relevant problems, in particu lar, the formation of gas-droplet jets, gas-and vapor-liquid mixtures with predetermined thermogas dynamic parameters. The effects of a number of factors and processes, like dispersion, component composi tion, flow regimes, phase transformations, and others, on the motion characteristics of two phase flows are determined.…”

Section: Introductionmentioning

confidence: 99%

Evaporation of single droplets and dispersed liquid flow in motion through high-temperature combustion products

Кузнецов

Стрижак

2014

High Temp

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Experimental study of the evaporation of single droplets and droplets in a flow of dispersed liquid in their motion through high temperature combustion products of a typical fuel is performed. The evapora tion rates of droplets of different sizes are compared; the characteristics of vaporization in a flow of dispersed liquid are analyzed. The conditions under which the drops moving first in the flow significantly slow the evap oration of the following drops are found.

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Section: Introductionmentioning

confidence: 99%

Evaporation of single droplets and dispersed liquid flow in motion through high-temperature combustion products

Кузнецов

Стрижак

2014

High Temp

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“…Let us represent dQ as: dQ = c pr dT (8) The parameter c pr represents the effective heat capacity of the non-stationary process, describing the correlation between changes in the temperature of the mixture dT and the lost heat amount dQ. Let us represent dQ as: dQ = c pr dT (8) The parameter c pr represents the effective heat capacity of the non-stationary process, describing the correlation between changes in the temperature of the mixture dT and the lost heat amount dQ.…”

Section: Thermodynamic Equationsmentioning

confidence: 99%

“…This explains interest to investigate problems of heat and mass transfer and hydrodynamics, especially wave dynamics in vapor-and gas-liquid systems [1][2][3]. For more complex case of vapor-gas mixture with solid particles and drops interphase impulse, mass and heat transfer was described in [8,9]. According to theory in the area of limited low frequencies of oscillations, approaching to equilibrium thermodynamic equilibrium acoustic velocity should occurr.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium acoustic velocity in vapor-liquid mixture in layer of spherical particles

et al. 2014

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Theoretical and experimental study of acoustic velocity in vapor-liquid mixture that contained close-packed layer of spherical particles was performed with respect to non-stationary heat transfer between mixture and particles in compression half-wave. Theoretical model allows to explain the decay of equilibrium acoustic velocity compared to its adiabatic value in case of increasing of void fraction in the mixture. Calculated results are in agreement with experimental data, obtained in vertical channel with vapor-liquid filtration with close-packed layer of spherical particles of borosilicate glass, steel, and lead. Key words: vapor-liquid mixture, layer of spherical particles, the equilibrium acoustic velocity, non-stationary heat transfer Pokusaev, B. G., et al.: Equilibrium Acoustic Velocity in Vapor-Liquid .

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“…If a gas mixture, along with an inert gas, contains vapor and liquid droplets, then in the process of vibrations phase transitions may occur that alter the temperature, pressure, and the speed of sound in a medium and, consequently, also the parameters of the dynamic process. Experimental and theoretical investigations of the indicated processes [2][3][4] carried out in recent years confi rm their complex character due to the mutual imposition of the indicated effects. Investigation of the mechanisms of these processes is an urgent problem in the mechanics of multiphase systems [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Description of Acoustic Vibrations of a Vapor–Gas–Droplet Mixture in a Closed Channel Based on a One-Velocity, One-Temperature Model

Bayanov

Tukmakov

2015

J Eng Phys Thermophy

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The paper describes a mathematical model and the results of numerical calculations of resonance acoustic vibrations of a vapor-gas-droplet mixture in a closed volume under the action of periodic acoustic waves generated by a harmonically vibrating piston. The numerical method of solving the equations of the model is based on MacCormack′s scheme. The model of equilibrium phase transitions used in the numerical scheme has allowed a chart of regimes of the vapor-gas-droplet mixture vibrations to be constructed depending on the initial vapor content. In accordance with the piston vibration amplitude, the limit of the critical vapor content below which vapor condensation is impossible has been found.Introduction. In mechanical and power engineering there exist a number of processes accompanied by an acoustic effect exerted on a vapor-gas-droplet medium. Such a situation develops in the course of motion of a vapor-gas-droplet mixture in pipes and channels of cooling systems and in acoustical resonators of adjustable exhaust systems. If the frequency spectrum of an external agency, to which aeroelastic vibrations of a structure or recurrent phases of ejections of combustion products can be related, contains resonance frequencies of an acoustic system, then there appear vibrations that depend on the mixture composition. The composition, in turn, depends on phase transitions and on the temperature and pressure attained in acoustical resonators, namely, in tubes, channels, and in the bounded volumes of baffl e chambers.Numerous experimental and numerical investigations show that with resonance vibrations of a gas in tubes considerable pressure and temperature drops are achieved at the rarefaction and compression fronts of nonlinear and shock waves [1]. If a gas mixture, along with an inert gas, contains vapor and liquid droplets, then in the process of vibrations phase transitions may occur that alter the temperature, pressure, and the speed of sound in a medium and, consequently, also the parameters of the dynamic process. Experimental and theoretical investigations of the indicated processes [2-4] carried out in recent years confi rm their complex character due to the mutual imposition of the indicated effects. Investigation of the mechanisms of these processes is an urgent problem in the mechanics of multiphase systems [5].The purpose of this work was to construct a mathematical model that would allow us to describe the dynamics of a vapor-gas-droplet mixture in an acoustical resonator depending on the initial mixture composition and the characteristics of external excitation.Mathematical Model. The method of describing the dynamics of a vapor-gas-droplet mixture with account for the acoustic effect is based on numerical solution of a system of mass conservation equations of the mixture and its components and of the momentum and energy conservation equations of the mixture with regard for the mass, momentum, and energy exchange between a liquid and its vapor in the process of phase transitions [5][6][7]. Let the mixture...

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Effect of the phase transformations on acoustics of a mixture of gas with vapor, droplets, and solid particles

Cited by 20 publications

References 7 publications

Evaporation of single droplets and dispersed liquid flow in motion through high-temperature combustion products

Evaporation of single droplets and dispersed liquid flow in motion through high-temperature combustion products

Equilibrium acoustic velocity in vapor-liquid mixture in layer of spherical particles

Numerical Description of Acoustic Vibrations of a Vapor–Gas–Droplet Mixture in a Closed Channel Based on a One-Velocity, One-Temperature Model

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