Propagation of a kinematic instability in a liquid layer: Capillary and gravity effects

Roisman, Ilia V.; Hinsberg, Nils Paul van; Tropea, C.

doi:10.1103/physreve.77.046305

Cited by 40 publications

(32 citation statements)

References 26 publications

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“…An example of the x-t diagrams of the droplet profile has confirmed the theoretical width relationship proposed by (Roisman et al 2008) holds, but a modified relationship for the dependence of the fitting parameter to the Weber number based on the film height is proposed and shown to be a better fit for our data as well as the data presented by (van Hinsberg 2010).…”

Section: Discussionsupporting

confidence: 82%

“…Lagubeau et al (2012) and Roisman et al (2008) have shown that the impact can be broken into several regimes. Initially there is a pressure dominated regime, when the droplet compresses under the influence of the impact, and this pressure leads to inertial motion in the radial direction (Lagubeau et al 2012).…”

Section: Resultsmentioning

confidence: 99%

“…In the initial stages of impact, the width of the impact crater is shown to be a function of the time (Roisman et al 2008)…”

Section: Development Of the Width Of The Cavitymentioning

confidence: 99%

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A study of droplet impact on static films using the BB-LIF technique

et al. 2016

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Section: Discussionsupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

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A study of droplet impact on static films using the BB-LIF technique

et al. 2016

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“…The dynamics of this effect for the case of horizontal surfaces has been studied by several authors (e.g. [28]). Okawa et al [29] investigated the drop impingement onto a film on an inclined surface while mostly focusing on the impact outcomes, e.g.…”

Section: Impacting Drop Produces Cavity In the Water Filmmentioning

confidence: 99%

Runoff initiation from raindrops falling onto planar inclined surface

Nezlobin¹,

Rubin²,

Lavee³

et al. 2013

Experimental Thermal and Fluid Science

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“…The authors found that in the case of droplet streams, the heat transfer efficiency decreased with the increase in velocity and size of droplets. Roisman et al [32] presented an image of a spray impacting on a surface which emphasizes the complex nature of the interactions that give rise to many simultaneous outcomes over a small area, e.g., droplet adhesion, rebounded and splashed drops, uprising jets and sheets, and fluctuating liquid films. Recently, the current authors presented an experimental and computational study concerning the interaction of a mist with a wall at room temperature.…”

mentioning

confidence: 99%

Heat Transfer and Observation of Droplet-Surface Interactions During Air-Mist Cooling at CSP Secondary System Temperatures

2015

Metall Mater Trans B

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Air-mists are key elements in the secondary cooling of modern thin steel slab continuous casters. The selection of water, W, and air, A, flow rates, and pressures in pneumatic nozzles open up a wide spectrum of cooling possibilities by their influence on droplet diameter, d, droplet velocity, v, and water impact flux, w. Nonetheless, due to the harsh environment resulting from the high temperatures and dense mists involved, there is very little information about the correlation between heat flux extracted, Àq, and mist characteristics, and none about the dynamics of drop-wall interactions. For obtaining both kinds of information, this work combines a steady-state heat flux measuring method with a visualization technique based on a high-speed camera and a laser illumination system. For wall temperatures, T w , between~723 K and~1453 K (~450°C and~1180°C), which correspond to film boiling regime, it was confirmed that Àq increases with increase in v, w, and T w and with decrease in d. It should be noticed, however, that the increase in w generally decreases the spray cooling effectiveness because striking drops do not evaporate efficiently due to the interference by liquid remains from previous drops. Visualization of the events happening close to the surface also reveals that the contact time of the liquid with the surface is very brief and that rebounding, splashing, sliding, and levitation of drops lead to ineffective contact with the surface. At the center of the mist footprint, where drops impinge nearly normal to the surface those with enough momentum establish intimate contact with it before forming a vapor layer that pushes away the remaining liquid. Also, some drops are observed sliding upon the surface or levitating close to it; these are drops with low momentum which are influenced by the deflecting air stream. At footprint positions where oblique impingement occurs, frequently drops are spotted sliding or levitating and liquid films flowing in from inner positions are seen generating vapor cushions after having stayed in contact with the surface. Visualization of events taking place under high,~500 kPa, and low,~200 kPa, air nozzle pressure, p a , conditions suggests that the considerably larger heat extraction obtained under high p a is related to more frequent impingement of finer and faster drops that result in the formation of a dense fog of tiny secondary drops that moves tangentially close to the surface.

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Propagation of a kinematic instability in a liquid layer: Capillary and gravity effects

Cited by 40 publications

References 26 publications

A study of droplet impact on static films using the BB-LIF technique

A study of droplet impact on static films using the BB-LIF technique

Runoff initiation from raindrops falling onto planar inclined surface

Heat Transfer and Observation of Droplet-Surface Interactions During Air-Mist Cooling at CSP Secondary System Temperatures

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