Particle and drop dynamics in the flow behind a shock wave

Boiko, V. M.; Poplavskii, S. V.

doi:10.1134/s0015462807030118

Cited by 15 publications

(12 citation statements)

References 9 publications

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“…A single drop of water d = 2-3 mm crossed the laser synchronization beam on the way to the channel axis and triggered the shock tube. The duration of the quasi-stationary flow behind the shock wave front is 500-700 microseconds [9,10].…”

Section: Methodsmentioning

confidence: 99%

“…The most effective testing of numerical technology is modeling in the calculation of the conditions realized in shock wave experiments and comparing the results with the maximum number of parameters. These can be integral quantitative parameters, such as the dynamics of acceleration and deformation of a drop [9,10], the period of induction of destruction [11]. This may include structural features that indicate the flow patterns of the droplet, the type of instability of its surface, and the deformation scenario, the physical mechanism of destruction, and the nature of the liquid erosion [11].…”

Section: Introductionmentioning

confidence: 99%

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On the induction period of drop breakup behind shock wave

Boiko

Минаков

Poplavski

et al. 2018

AIP Conference Proceedings

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The work is devoted to the experimental and numerical study of the dynamics and destruction of water droplets in the air flow behind incident shock wave in the Weber number range We = 150-2350. The structure of the flow near and in the wake of the drop is studied, the streamline features are established that determine the type of evolution of the drop form characteristic of these breakup modes and the erosion character. Comparison of the results of numerical simulation with experiments on the morphology of the drop was performed, as well as on dynamics, deformation, and the induction delay of breakup. Good agreement between calculations and experiments on the main characteristics of the process is shown.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the induction period of drop breakup behind shock wave

Boiko

Минаков

Poplavski

et al. 2018

AIP Conference Proceedings

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“…Generally speaking, C x of droplets due to deformation and erosion can differ substantially from the C D of a solid sphere [9][10][11], which has been well studied for various regimes in terms of the Re number [11]. Here, according to [9,10], we assume C x~2 .3 C D~ 1 -1.5 from subsonic to supersonic velocities. Figure 3 shows the results of measuring the fluid velocity (LDA) and the average droplet size ("Malvern Spraytec") on the axis of a two-phase jet, depending on the distance from the cut of the nozzle x for different flow regimes.…”

Section: Experiments and Parameters Of Gas-liquid Jetmentioning

confidence: 99%

“…The known velocity profile of the liquid phase makes it possible to determine the droplet acceleration by the gas flow as a measure of the aerodynamic force for a known mass (size), and in terms of acceleration, in turn, the droplet size can be estimated under the assumption of sphericity. Indeed, from the equation of motion of the droplet upon a sudden entry into the flow, the acceleration a depends on the droplet diameter d as follows [9][10][11]:…”

Section: Experiments and Parameters Of Gas-liquid Jetmentioning

confidence: 99%

Coaxial gas-liquid jet: Dispersion and dynamics

Poplavski

Boiko

Lotov

et al. 2018

AIP Conference Proceedings

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Abstract. The aim of the work was to study the pneumatic spraying of liquids in a gas jet with reference to the creation of high-flow nozzles. A complex experimental study of a coaxial jet was performed with a central supply of liquid beyond the cutoff of the confusor nozzle at subsonic and supersonic flow conditions. A set of optical methods for flows diagnostics that can function in dense gas-liquid jets provides new data on the structure of the spray: the gas velocity field without liquid, shadow visualization of the geometry and wave structure of the jet with and without fluid, the velocity profiles of the liquid phase, size distribution of the droplets. The key parameters of the liquid breakup processes for the We numbers are obtained. A dynamic approach to the determination of average droplet sizes is considered. A physical model of a coaxial gas-liquid jet with a central fluid supply is proposed.

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“…[2][3][4][5]. The case in study of shock ejecting in liquids and liquid metals with smooth and mirror-like surfaces is of special interest.…”

Section: Introductionmentioning

confidence: 99%