Modeling of aqueous foam blast wave attenuation

Prete, E. Del; Chinnayya, A.; Hadjadj, A.; Domergue, L.; Haas, J. F.; Imbert, B.

doi:10.1051/epjconf/20101000035

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…Liquid foams are used in many process such as ion separation via flotation, [2] nuclear decontamination [3] or explosion confinement. [4] A recent application [5] proposes using foam in Enhanced Oil Recovery (EOR) process in order to extract oil in natural reservoirs. This specific application requires the generation of foams in porous media with the aim of reaching and displacing the oil in place.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic comparative study of foam flow between a classical and a pH sensitive surfactant

Micheau

Rosenberg

Barré

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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International audienceComparative study between foams made of a pH sensitive surfactant, nonaoxyethylene oleylether carboxylic acid (AKYPO® RO 90 VG) and a classical foaming surfactant, sodium dodecyl sulphate (SDS) was realised using simple microfluidic devices in the scope of Enhanced Oil Recovery (EOR). The influence of injecting fluid parameters such as gas and foaming liquid pressure was investigated and discussed in terms of foam morphology, and lamellae stability and curvature radii. The increasing stability of AKYPO® foam film lamellae by increasing pH is classically explained by the electrostatic repulsive interaction of the double layer in foam film. In other hand, the addition of dodecanol (DOH) on SDS solution seems to have no effect on foam regime and lamellae stability except for high DOH concentration where the foam film shape becomes double bump. The behaviour difference between AKYPO® and SDS lays on the lamellae shape and stability domain. While SDS lamellae stay unchanged with increasing pressure ratio between the gas and the liquid, AKYPO® lamellae curvature radius increases which could be related to surfactants solubilities and structure. These results pointed out the relevance of solution physicochemical parameters on foam stability and flowing and help the understanding of flowing foam in EOR context

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Section: Introductionmentioning

confidence: 99%

Microfluidic comparative study of foam flow between a classical and a pH sensitive surfactant

Micheau

Rosenberg

Barré

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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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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Experimental studies on blast mitigation capabilities of conventional dry aqueous foam

Ahmed

Malik

2020

AIP Advances

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Aqueous foam provides a dispersion of the gaseous phase in the liquid phase. The commercially available aqueous foam (Denim shaving foam-original) has been investigated for its stability and capability for reducing the extreme thermal and blast effects associated with an energetic material detonation. The dry aqueous foam has evenly distributed bubbles with an average initial size of 15 µm. Different amounts of the C4 explosive were detonated while immersed in the dry aqueous foam having a density 60 kg/m3. The blast wave parameters were measured in the field for scaled distances ranging from 0.39 m/kg1/3 to 1.80 m/kg1/3 based on the cube root law. The dry aqueous foam confinement suppressed the explosion fireball radius up to 80% and quenched the afterburning reactions. An average peak pressure reduction of 70% and positive impulse reduction of ∼62% were observed for hemi-spherical confinement of the dry aqueous foam weighing 1.0 kg–2.75 kg against C4 charges of 82 g–250 g. The shock propagation is attenuated due to the high compressibility of gas bubbles. The dry aqueous foam may be used in emergency circumstances such as against energetic material detonation and lighter improvised explosive device threats to reduce the devastating blast effects. The numerical simulation results using ANSYS AUTODYN for bare charges are in fair agreement with the experimental findings.

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Modeling of aqueous foam blast wave attenuation

Cited by 3 publications

References 10 publications

Microfluidic comparative study of foam flow between a classical and a pH sensitive surfactant

Microfluidic comparative study of foam flow between a classical and a pH sensitive surfactant

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

Experimental studies on blast mitigation capabilities of conventional dry aqueous foam

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