Experimental investigation of the propagation of a planar shock wave through a two-phase gas-liquid medium

Chauvin, A.; Jourdan, G.; Daniel, Éric; Houas, L.; Tosello, R.

doi:10.1063/1.3657083

Cited by 44 publications

(46 citation statements)

References 15 publications

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“…The first section in the last part will provide some approximate solutions of analytical test cases, including the measure of the L 1 norm of the error. Eventually, we will show some results corresponding to the propagation of a shock wave through a cloud of liquid droplets, which corresponds to the experimental setup of the paper [8]. One crucial point is that the latter configuration is very similar to what happens in the steam explosion setup, and meanwhile, this will give some good confidence with respect to the modeling of the break-up phenomenon.…”

Section: Introductionmentioning

confidence: 57%

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Relaxation and simulation of a barotropic three-phase flow model

Boukili

Hérard

2019

ESAIM: M2AN

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We focus here on a three-phase flow model in order to represent complex flows involving liquid metal droplets, liquid water, and its vapour. The governing equations and its main properties are given, and focus is given on the pressure–velocity relaxation process on the one hand, and on the structure of solutions of the one-dimensional Riemann problem associated with pure convective effects. A fractional step method that computes successively the convective part and the relaxation effects is used to obtain approximate solutions on unstructured meshes. Details of algorithms are provided, and it is shown that the numerical method preserves positive values of statistical fractions and partial masses. Verification and validation test cases are presented, and some perspectives are eventually drawn.

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Section: Introductionmentioning

confidence: 57%

“…The second subsection will focus on the experimental set-up proposed in [8]. As mentioned briefly in the introduction, a shock tube apparatus will generate a shock wave propagating towards the right hand side, which will hit a cloud of spherical particles and interact with it.…”

Section: Numerical Resultsmentioning

confidence: 99%

Relaxation and simulation of a barotropic three-phase flow model

Boukili

Hérard

2019

ESAIM: M2AN

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“…21 The correlation with the present investigation is made though the similarity of the two-phase medium (gas-liquid), the liquid volume fraction (approximatively 1%), and the shock wave strength. Fig.…”

Section: E Pressure Profile In a Cloud Of Dropletsmentioning

confidence: 98%

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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“…Primary inlet conditions are shown in Table 1 with P sec = 414.6 kPa and T sec = 20 • C. Four injection fraction values are considered: X inj = 1%, 2%, 5% and 10%. For all cases, droplets of diameter φ inj = 500 µm (average value measured by Chauvin et al [28] from a commercial atomizer) are injected at a temperature of T inj = −13 • C to ensure liquid phase at the typical CAS pressure values encountered. No variations are expected on the entrainment ratio due to the droplet injection at the CAS, since the model determines ω r based solely on the inlet conditions and the throat areas A L2 and A L3,sec (see Section 2.2).…”

Section: Effect Of Droplet Injection On the Ejector Performancementioning

confidence: 99%

“…Droplets deform and breakup at the encounter with a shock front [27], extracting energy from the gas and reducing its velocity and pressure increase rate [28]. In the context of ejectors, the objective is to reduce the shock intensity in the CAS, which accounts for about 40% of the exergy destroyed through the device [22].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Modelling of Supersonic Gas Ejector with Droplets

Croquer

Poncet

Aidoun

2017

Entropy

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This study presents a thermodynamic model for determining the entrainment ratio and double choke limiting pressure of supersonic ejectors within the context of heat driven refrigeration cycles, with and without droplet injection, at the constant area section of the device. Input data include the inlet operating conditions and key geometry parameters (primary throat, mixing section and diffuser outlet diameter), whereas output information includes the ejector entrainment ratio, maximum double choke compression ratio, ejector efficiency, exergy efficiency and exergy destruction index. In single-phase operation, the ejector entrainment ratio and double choke limiting pressure are determined with a mean accuracy of 18% and 2.5%, respectively. In two-phase operation, the choked mass flow rate across convergent-divergent nozzles is estimated with a deviation of 10%. An analysis on the effect of droplet injection confirms the hypothesis that droplet injection reduces by 8% the pressure and Mach number jumps associated with shock waves occuring at the end of the constant area section. Nonetheless, other factors such as the mixing of the droplets with the main flow are introduced, resulting in an overall reduction by 11% of the ejector efficiency and by 15% of the exergy efficiency.

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Experimental investigation of the propagation of a planar shock wave through a two-phase gas-liquid medium

Cited by 44 publications

References 15 publications

Relaxation and simulation of a barotropic three-phase flow model

Relaxation and simulation of a barotropic three-phase flow model

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

Thermodynamic Modelling of Supersonic Gas Ejector with Droplets

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