Interfacial deformation between an impacting water drop and a silicone-oil surface

Fujimatsu, Takahiro; Fujita, Hideomi; Hirota, Masafumi; Okada, Osamu

doi:10.1016/s0021-9797(03)00402-8

Cited by 29 publications

(15 citation statements)

References 23 publications

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“…Instead, a thin layer of raindrop fluid travels up the crown wall and subsequently retracts down the wall, at speeds of up to 0.8 m s −1 , to the cavity bottom. Retraction of the drop fluid into the cavity bottom is also reported by Fujimatsu et al (2003) and by Lhuissier et al (2013) for water drops impacting silicone oil at lower We than that studied here that do not involve a crown. By this time (∼8 ms), due to the cavity growth, the oil layer lining its walls has been stretched to a thickness of approximately 4 µm, estimated by assuming that the circular area underlying the droplet is stretched into a hemisphere.…”

Section: The Effect Of Oil Layer Thicknesssupporting

confidence: 83%

Splash behaviour and oily marine aerosol production by raindrops impacting oil slicks

Murphy

d’Albignac

et al. 2015

J. Fluid Mech.

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The high-speed impact of a droplet on a bulk fluid at high Weber number (We) is not well understood but is relevant to the production of marine aerosol by raindrop impact on the sea surface. These splashes produce a subsurface cavity and a crown which closes into a bubble canopy, but a floating layer of immiscible oil, such as a crude oil slick, alters the splash dynamics. The effects of oil layer fluid properties and thickness, droplet size and impact speed are examined by high-speed visualization. Oil layer rupture and crown behaviour are classified by dimensional scaling. The subsurface cavity volume for impact on thick layers is shown to depend on the Reynolds number (Re), although canopy formation at high Re introduces a competing We effect since rapid canopy closure is found to retard cavity expansion. Time-resolved kinematic measurements show that thin crude oil slicks similarly alter crown closure and cavity growth. The size and spatial distributions of airborne droplets are examined using high-speed holographic microscopy. The droplets have a bimodal distribution with peaks at 50 and 225 µm and are clustered by size at different elevation angles. Small droplets (50 µm) are ejected primarily at shallow angles, indicating production by splashing within the first 100 µs and by breakup of microligaments. Larger droplets (225 µm) are found at steeper elevation angles, indicating later production by capillary instability acting on large ligaments protruding upward from the crown. Intermittent droplet release while the ligaments grow and sweep upward is thought to contribute to the size-dependent spatial ordering. Greater numbers of small droplets are produced at high elevation angles when a crude oil layer is present, indicating satellite droplet formation from ligament breakup. A crude oil layer also increases the target fluid Ohnesorge number, leading to creation of an intact ejecta sheet, which then ruptures to form aerosolized oil droplets.

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Section: The Effect Of Oil Layer Thicknesssupporting

confidence: 83%

Splash behaviour and oily marine aerosol production by raindrops impacting oil slicks

Murphy

d’Albignac

et al. 2015

J. Fluid Mech.

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“…The purpose is to take into account the effect of surface tension force in determining the drop size and drop shape during drop detachment, during falling or impaction [27,28], although its influence could have been subdued by the solution viscosity. Within the experimental limits of this study, the Oh is in the range of 0.075-13 (see Table 3).…”

Section: Physical Properties Of Alginate Solutionmentioning

confidence: 99%

“…The position of the boundary is reasonable because it suggests that the shape deformation occurs before drop disintegration could take place in a liquid-liquid impact. A drop disintegration equation in a liquid-liquid impact was proposed by Fujimatsu et al [28] and it is shown with a line in Fig. 6.…”

Section: Shape Indicator Equation Remarksmentioning

confidence: 99%

Prediction models for shape and size of ca-alginate macrobeads produced through extrusion–dripping method

Chan¹,

Lee²,

Ravindra³

et al. 2009

Journal of Colloid and Interface Science

349

250

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The aim of this work was to develop prediction models for shape and size of ca-alginate macrobeads produced through extrusion-dripping method. The relationship between the process variables on the shape and size of the alginate drops before and after gelation was established with the aid of image analysis. The results show that a critical Ohnersorge number (Oh)>0.24 was required to form spherical beads. The shape transition of ca-alginate beads could be typically distinguished into three phases along the collecting distance and it was affected by the combined influence of the solution properties, the collecting distance and the drop size. Mathematical equations and a master shape diagram were developed to reveal a clear operating region and the overall process limits within which spherical ca-alginate beads could be formed. In terms of bead size, the overall size correction factor (K) which accounted for the liquid loss factor (k(LF)) and the shrinkage factor (k(SF)), varied between 0.73 and 0.85 under the experimental conditions. The size prediction model correlated well with the experimental data. The approach and the outcome could be used as a model to develop prediction tools for similar bead production systems.

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“…Experimental studies were carried out to measure the equilibrium contact angles of such nanoparticle at liquid-liquid interfaces by various techniques [5][6][7]. Some dynamical aspects of the interaction of a solid particle with a planar gas-liquid interface were studied experimentally for an air/silicone-oil surface [8]. For binary mixtures of immiscible liquids nanoparticle adsorption to the interface can help stabilize microemulsions [1,9].…”

Section: Introductionmentioning

confidence: 99%

The role of capillary and surface forces in the crossover behavior of solid nanoparticles at liquid interfaces

Livadaru

Kovalenko

2006

Journal of Colloid and Interface Science

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Interfacial deformation between an impacting water drop and a silicone-oil surface

Cited by 29 publications

References 23 publications

Splash behaviour and oily marine aerosol production by raindrops impacting oil slicks

Splash behaviour and oily marine aerosol production by raindrops impacting oil slicks

Prediction models for shape and size of ca-alginate macrobeads produced through extrusion–dripping method

The role of capillary and surface forces in the crossover behavior of solid nanoparticles at liquid interfaces

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