2019
DOI: 10.1007/s42452-019-1843-z
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Investigation of mechanisms leading to water drop breakup at Mach 4.4 and Weber numbers above 105

Abstract: The paper presents an investigation on water drop breakup in the 'catastrophic' mode at Weber numbers above 10 5. Experimental data have been obtained on a detonation shock tube operated at a Mach number between 4.2 and 4.6. Displacement and deformation of the mist cloud generated around the droplet were observed with a shadowgraph system, and Schlieren imagery was used to visualise the bow and wake shocks around the droplet. We observe that all measured quantities scale with the initial drop diameter. In orde… Show more

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Cited by 12 publications
(19 citation statements)
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“…They identified two mechanisms that are responsible for the droplet deformation at the earlystages, namely: i) pressure mechanism, which is responsible for the droplet flattening, and ii) shear mechanism, which is responsible for the formation of the small rings and bulges. Recently, (Hébert et al 2019) studied experimentally and numerically in 2-dimensions, using an in-house code called Hesione, the breakup of water droplets exposed to gas flows of Ma=4.2-4.6 and We>10 5 . They encountered the catastrophic breakup mode and divided the breakup process into three steps: i) droplet flattening, ii) fragmentation initiation at the outer rim of the droplet, and iii) droplet takes the shape of a filament aligned with the flow.…”
Section: Introductionmentioning
confidence: 99%
“…They identified two mechanisms that are responsible for the droplet deformation at the earlystages, namely: i) pressure mechanism, which is responsible for the droplet flattening, and ii) shear mechanism, which is responsible for the formation of the small rings and bulges. Recently, (Hébert et al 2019) studied experimentally and numerically in 2-dimensions, using an in-house code called Hesione, the breakup of water droplets exposed to gas flows of Ma=4.2-4.6 and We>10 5 . They encountered the catastrophic breakup mode and divided the breakup process into three steps: i) droplet flattening, ii) fragmentation initiation at the outer rim of the droplet, and iii) droplet takes the shape of a filament aligned with the flow.…”
Section: Introductionmentioning
confidence: 99%
“…To our knowledge, it seems that the majority of literature works (except the first experimental ones) do not deal with configurations where M is higher than 4. Especially, coupled numerical/experimental studies for low-hypersonic cases (M = 4-7) seem to be inexistent in literature, except a recent work [21] wherein the authors validate a Volume of Fluid (VOF) model by comparing the numerical results with experimental data for a M-4.25 situation.…”
Section: Introductionmentioning
confidence: 99%
“…Concerning cases where M ≤ 4, data are already substantial in the literature. For this reason, we chose in this paper the reference case recently published in [21], where a low-hypersonic shock wave (M = 4.25) hits a water droplet (Ø i = 1.135 mm). The purpose of the present article is then to make a comparison between two numerical approaches (VOF and DI), in order to determine which is most appropriate to retranscribe, interpret and understand the experimental data presented in [21].…”
Section: Introductionmentioning
confidence: 99%
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