Macro-mechanical modeling of blast-wave mitigation in foams. Part III: verification of the models

Britan, A. B.; Liverts, M.; Ben‐Dor, G.

doi:10.1007/s00193-013-0485-0

Cited by 8 publications

(3 citation statements)

References 25 publications

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“…The foam represents a two-phase medium in which the compression waves attenuate due to the momentum and heat losses. This feature of the foam, in particular, is widely used to suppress the dynamic loads on the solid constructions with foam barriers [29,39]. Due to this effect, the compression wave propagates through the foam with a lower speed that defines the same localization effect of the compression zone at a short distance ahead of the flame front (Figure 6), as discussed above.…”

Section: Detonationmentioning

confidence: 95%

Numerical Modeling of Combustion and Detonation in Aqueous Foams

Киверин

Yakovenko

2021

Energies

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Combustible aqueous foams and foamed emulsions represent prospective energy carriers. This paper is devoted to the overview of model assumptions required for numerical simulations of combustion and detonation processes in aqueous foams. The basic mathematical model is proposed and used for the analysis of the combustion development in the wet aqueous foam containing bubbles filled with reactive gas. The numerical results agree with the recent experimental data on combustion and detonation in aqueous foams containing premixed hydrogen–oxygen. The obtained results allowed for distinguishing the mechanisms of flame acceleration, transition to detonation, detonation propagation, and decay.

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Section: Detonationmentioning

confidence: 95%

Numerical Modeling of Combustion and Detonation in Aqueous Foams

Киверин

Yakovenko

2021

Energies

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“…It is a much more flexible device that helps getting reliable data with less experimental dispersion errors and exploring the full advantage of the cellular foam structure. Along this line, the works of Britan et al [10][11][12][13][14][15][16] are incontestably among the best existing references in the literature so far. When a shock wave interacts with an aqueous foam, mechanical and thermal exchanges take place between the two phases.…”

Section: Introductionmentioning

confidence: 95%

Analysis of shock-wave propagation in aqueous foams using shock tube experiments

et al. 2015

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International audienceThis paper reports experimental results of planar shock waves interacting with aqueous foams in a horizontal conventional shock tube. Four incident shock wave Mach numbers are considered, ranging from 1.07 to 1.8, with two different foam columns of one meter thickness and expansion ratios of 30 and 80. High-speed flow visualizations are used along with pressure measurements to analyse the main physical mechanisms that govern shock wave mitigation in foams. During the shock/foam interaction, a precursor leading pressure jump was identified as the trace of the liquid film destruction stage in the foam fragmentation process. The corresponding pressure threshold is found to be invariant for a given foam. Regarding the mitigation effect, the results show that the speed of the shock is drastically reduced and that wetter is the foam, slower are the transmitted waves. The presence of the foam barrier attenuates the induced pressure impulse behind the transmitted shock, while the driest foam appears to be more effective, as it limits the pressure induced by the reflected shock off the foam front. Finally, it was found that the pressure histories in the two-phase gas-liquid mixture are different from those previously obtained within a cloud of droplets. The observed behavior is attributed to the process of foam fragmentation and to the modification of the flow topology past the shock. These physical phenomena occurring during the shock/foam interaction should be properly accounted for when elaborating new physical models. (C) 2015 AIP Publishing LLC

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“…Of these methods, porous structures featuring pores several orders of magnitude smaller than the diameter of the duct have demonstrated a great deal of promise. The most common examples of such structures are rigid or flexible granular filters [12][13][14] or foams made of solid materials or liquids [15][16][17][18][19][20][21][22]. A three-part article series with reviews on the current standing on aqueous foams and experimental observations is presented by Britan et al [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Shock Wave Attenuation Using Foam Obstacles: Does Geometry Matter?

et al. 2015

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A shock wave impact study on open and closed cell foam obstacles was completed to assess attenuation effects with respect to different front face geometries of the foam obstacles. Five different types of geometries were investigated, while keeping the mass of the foam obstacle constant. The front face, i.e., the side where the incident shock wave impacts, were cut in geometries with one, two, three or four convergent shapes, and the results were compared to a foam block with a flat front face. Results were obtained by pressure sensors located upstream and downstream of the foam obstacle, in addition to high-speed schlieren photography. Results from the experiments show no significant difference between the five geometries, nor the two types of foam.

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Macro-mechanical modeling of blast-wave mitigation in foams. Part III: verification of the models

Cited by 8 publications

References 25 publications

Numerical Modeling of Combustion and Detonation in Aqueous Foams

Numerical Modeling of Combustion and Detonation in Aqueous Foams

Analysis of shock-wave propagation in aqueous foams using shock tube experiments

Shock Wave Attenuation Using Foam Obstacles: Does Geometry Matter?

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