Atomization by jet impact

Brémond, Nicolas; Villermaux, Emmanuel

doi:10.1017/s0022112005007962

Cited by 165 publications

(160 citation statements)

References 38 publications

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“…That duality is not new, and has been discussed at length in several related contexts, like to describe the indentations of the liquid sheet resulting from the impact of two jets, 13,14 or to understand the Worthington crowns in the impact of a drop on a solid, a liquid layer or in a fast gas stream, [15][16][17] and for more general straight receding free edges. [18][19][20] The present academic study offers the possibility to address this issue; the answer is, however, equally disappointing, and straightforward: In the limit of a massive rim …”

mentioning

confidence: 99%

The destabilization of an initially thick liquid sheet edge

Lhuissier

Villermaux

2011

Physics of Fluids

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International audienceBy forcing the sudden dewetting of a free soap film attached on one edge to a straight solid wire, we study the recession and subsequent destabilization of its free edge. The newly formed rim bordering the sheet is initially thicker than the film to which it is attached, because of the Plateau border preexisting on the wire. The initial condition is thus that of an immobile massive toroidal rim connected to a thin liquid film of thickness h. The terminal Taylor-Culick receding velocity V = sqrt(2 sigma/rho h), where sigma and rho are the liquid surface tension and density, respectively, is only reached after a transient acceleration period which promotes the rim destabilization. The selected wavelength and associated growth time coincide with those of an inertial instability driven by surface tension

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mentioning

confidence: 99%

The destabilization of an initially thick liquid sheet edge

Lhuissier

Villermaux

2011

Physics of Fluids

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“…In Figure 4, verification of an example model with the analytical and numerical ones presented in Refs. [11][12] are provided. As can be seen, the length and shape of the formed sheet is in a very good agreement with experimental results.…”

Section: Resultsmentioning

confidence: 99%

“…As can be seen, the length and shape of the formed sheet is in a very good agreement with experimental results. Experimental and simulation conditions for collision of the jets at low velocities are taken as the simulations performed by Bremond and Villermaux [11]. The injected liquid is water-glycerin with a diameter and jet velocity of 400 micro meters and 3.3 meters per second, respectively.…”

Section: Resultsmentioning

confidence: 99%

Numerical Simulation of Like and Unlike Impinging Jets

Dolatkhahi¹,

Oliaee²,

Kebriaee³

2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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In the present study, using the open source OpenFOAM code, a numerical simulation is performed taking the adaptive mesh refinement (AMR) technique during solution. Formation of liquid sheet after the impact of two identical cylindrical jets at various conditions is studied. Since the flow pattern depends upon the Reynolds and Weber numbers, numerical tests are conducted at a variety of flow velocities and Reynolds numbers to demonstrate the effect of these parameters on the sheet formation. It is then concluded that at various conditions, different instabilities occur in the flow; hence, different sheet formations a flow patterns happen. In this study, impact of two dissimilar cylindrical fluid jets is successfully simulated for the first time in literature. Actually, water and oil jets are taken into account and their impact behavior is studied. In the presence of the surrounding air, an unstable sheet will form after impact due to the high injection speed of the jets. As depicted in the results, since the inertia and other physical characteristics of the two fluids are dissimilar, different phases are more intensely diffused.

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“…The same distribution has also been shown to provide a good model for the fragment sizes for liquid sheets resulting from the oblique collision of two cylindrical jets [29] and for an axisymmetric expanding sheet formed by the impact of a steady gravity-driven circular jet and droplet onto the horizontal upper surface of a solid cylinder [30,31]. The Γ distribution is…”

Section: (B) Spray Sizementioning

confidence: 88%

Size distributions of sprays produced by violent wave impacts on vertical sea walls

Watanabe

Ingram

2016

Proc. R. Soc. A.

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When a steep, breaking wave hits a vertical sea wall in shallow water, a flip-through event may occur, leading to the formation of an up-rushing planar jet. During such an event, a jet of water is ejected at a speed many times larger than the approaching wave's celerity. As the jet rises, the bounded fluid sheet ruptures to form vertical ligaments which subsequently break up to form droplets, creating a polydisperse spray. Experiments in the University of Hokkaido's 24 m flume measured the resulting droplet sizes using image analysis of high-speed video. Consideration of the mechanisms forming spray droplets shows that the number density of droplet sizes is directly proportional to a power p of the droplet radius: where p = −5/2 during the early break-up stage and p = −2 for the fully fragmented state. This was confirmed by experimental observations. Here, we show that the recorded droplet number density follows the lognormal probability distribution with parameters related to the elapsed time since the initial wave impact. This statistical model of polydisperse spray may provide a basis for modelling droplet advection during wave overtopping events, allowing atmospheric processes leading to enhanced fluxes of mass, moisture, heat and momentum in the spraymediated marine boundary layer over coasts to be described.

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Atomization by jet impact

Cited by 165 publications

References 38 publications

The destabilization of an initially thick liquid sheet edge

The destabilization of an initially thick liquid sheet edge

Numerical Simulation of Like and Unlike Impinging Jets

Size distributions of sprays produced by violent wave impacts on vertical sea walls

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