Experimental study of splashing patterns and the splashing/deposition threshold in drop impacts onto dry smooth solid surfaces

Palacios, Julián; Hernández, J.; Gómez, Pablo; Zanzi, Claudio; López, J.

doi:10.1016/j.expthermflusci.2012.08.020

Cited by 112 publications

(90 citation statements)

References 12 publications

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“…Since the drop impact outcome and flow pattern are very sensitive to the radius of curvature of the drop at the impact point (Palacios et al 2010), the occurrence of drop impacts of a non-spherical shape at the impact instant may slightly affect the repeatability of the experiments, but not the qualitative validity of the conclusions drawn in this work. Finally, it is worth noting that a lack of repeatability of the experiments was found when an excessively long time interval (of the order of minutes) elapsed between consecutive drop impact tests (see Fig.…”

Section: Methodsmentioning

confidence: 98%

“…1a). For liquids of low and intermediate viscosity (0.5-7 cP), the occurrence of splashes can usually be ascertained through lateral visualization of the impacts, which allows the limit between deposition and splash regimes to be accurately determined (Palacios et al 2010). However, in the case of high-viscosity mixtures, separation of the liquid from the solid surface is not easily visible in the experiments from a lateral viewpoint.…”

Section: Methodsmentioning

confidence: 98%

“…The mentioned discrepancies are probably due to differences in the experimental conditions considered, especially those related with surface roughness and wettability. To investigate the splash-deposition limit, we carried out an experimental study of drop impact onto a smooth, dry glass surface over a range of Re numbers between 300 and 20,000 and We numbers up to 1,500 (Palacios et al 2010). For impacts with Re numbers in the order of or above 1,000, the splash-deposition limit was relatively easy to determine with acceptable accuracy through lateral visualization, whereas for lower Re numbers, the existence or absence of a splash was usually more complicated to ascertain.…”

Section: Introductionmentioning

confidence: 99%

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On the impact of viscous drops onto dry smooth surfaces

et al. 2012

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An experimental study of the impact of glycerol/water drops onto a dry glass surface at Reynolds and Weber numbers around the splashing/deposition threshold is presented. Some new observed phenomena that may shed further light on the mechanisms underlying air bubble entrainment and splashing for high-viscosity liquids are presented and discussed. The experiments were recorded with a high-speed camera using two complementary lighting setups that enhance the visualization of different features of the air entrainment phenomena: backlighting with a light diffuser and oblique lighting without diffuser. Besides the ring of micro-bubbles surrounding the central entrapped bubble and the cloud of bubbles entrained as a result of the interaction between a levitated thin film and the solid surface, which have been studied by other authors in previous works, a second ring of micro-bubbles that delimits the outer cloud of bubbles has been detected in our investigation. Attention is mainly focused on analyzing the dependency of the behavior of the two rings of microbubbles on the drop impact velocity, the ranges of the relevant dimensionless numbers in which the rings are formed and the existence, in certain impact conditions, of an abrupt increase in the size of the second ring, which substantially modifies the impact outcome.

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Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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On the impact of viscous drops onto dry smooth surfaces

et al. 2012

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“…Impacts at sufficiently high speed result in a splash, which involves the formation of a liquid sheet, a crown, which then destabilizes into droplets. Previous studies focused on the crown dynamics and droplet ejection in axisymmetric configurations [33][34][35][36][37]. Increasing attention has also been paid to impacts on small solid targets of size comparable to that of the drop diameter [38][39][40][41][42] or binary drop collision [43,44].…”

Section: Introductionmentioning

confidence: 99%

Edge effect: Liquid sheet and droplets formed by drop impact close to an edge

2018

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Asymmetric liquid sheet fragmentation is ubiquitous in nature and potentially shapes critical phenomena such as rain-induced propagation of foliar diseases. In this experimental study, we investigate the formation and fragmentation of a liquid sheet upon impact of a drop close to the edge of a solid substrate. Both the impact Weber number and the offset, the distance from the impact point to the edge, are systematically varied. Their influence on the kinematics of the liquid sheet and the subsequent statistics of droplet ejection are rationalized. Three major asymmetry scenarios are identified and linked to distinct droplet ejection patterns. Scaling laws are proposed to rationalize these scenarios based on impact parameters.

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“…Theoretical studies of multiphase flows are mainly based on linear theories (Rayleigh, 1878;Taylor, 1963) but yet most phenomena in multiphase flows display nonlinear feedback mechanisms. Modern experimental studies employ high-speed cameras, pulsed shadowgraph, and holograph techniques (Sallam et al, 1999(Sallam et al, , 2004Palacios et al, 2010) in order to understand the complex processes in multiphase flows, nonetheless, it is still very difficult to capture the detailed flow fields.…”

Section: Introductionmentioning

confidence: 99%

Incompressible multiphase flow and encapsulation simulations using the moment‐of‐fluid method

Lian

Guo

et al. 2015

Numerical Methods in Fluids

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A moment of fluid method is presented for computing solutions to incompressible multiphase flows in which the number of materials can be greater than two. In this work, the multimaterial moment-of-fluid interface representation technique is applied to simulating surface tension effects at points where three materials meet. The advection terms are solved using a directionally split cell integrated semi-Lagrangian algorithm and the projection method is used to evaluate the pressure gradient force term. The underlying computational grid is a dynamic block structured adaptive grid. The new method is applied to multiphase problems illustrating contact line dynamics, triple junctions, and encapsulation in order to demonstrate its capabilities. Examples are given in 2D, 3D axisymmetric (R-Z), and 3D (X-Y-Z) coordinate systems.

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Experimental study of splashing patterns and the splashing/deposition threshold in drop impacts onto dry smooth solid surfaces

Cited by 112 publications

References 12 publications

On the impact of viscous drops onto dry smooth surfaces

On the impact of viscous drops onto dry smooth surfaces

Edge effect: Liquid sheet and droplets formed by drop impact close to an edge

Incompressible multiphase flow and encapsulation simulations using the moment‐of‐fluid method

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