Classification of Impact Morphology and Splashing/Deposition Limit for N-Hexadecane

Geppert, A.; Chatzianagnostou, Dimitrios; Meister, Christian; Gomaa, Hassan; Lamanna, Grazia

doi:10.1615/atomizspr.2015013352

Cited by 27 publications

(44 citation statements)

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“…The measurement accuracy for the droplet diameter and the impact velocity is in the range of 2, 1% and 2%, respectively. The error related to the measurement of the film thickness is less than 1% (which is also reported in Geppert et al [3]). The classification of the outcomes (splashing, transition or deposition) was judged visually for each experiment.…”

Section: Methodssupporting

confidence: 75%

“…This method uses the difference in refractive index between the wall film fluid and the plate analyzing the spectral distribution of the reflected light. More details about the experimental setup can be found in [3].…”

Section: Methodsmentioning

confidence: 99%

“…After all fluids were tested as wall film, the entire dropper (pipes and needle) was replaced for the next droplet fluid. The experimental uncertainties for this experimental setup are detailed in [3]. The measurement of droplet diameter and impact velocities are performed with an in house MATLAB routine from consecutive images just before impact.…”

Section: Methodsmentioning

confidence: 99%

“…Geppert et al [3] also worked on a unified approach of the splashing/deposition limit for one-and two-component interaction. Their empirical correlation was based on the impact factor K and δ, similarly to Cossali et al [2].…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, we permutated several silicon oils and hexadecane for the droplet and wall film liquids. Furthermore, a large database of one-and two-component interactions from [1,2,3] is combined with the performed experimental results.…”

Section: Introductionmentioning

confidence: 99%

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Generalized analysis of the deposition/splashing limit for one- and two-component droplet impacts upon thin films

Bernard

Foltyn

Geppert

et al. 2017

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

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Single drop impacts on thin liquid layers are of particular interest because of the ejection of secondary droplets, the so-called splashing. Only a few studies handle the deposition/splashing limit for two-component interaction, where the liquid properties of the impacting drop and wall film differ significantly. This study aims at identifying a unified approach for one-and two-component interactions to determine the deposition/splashing limit. Therefore, a large database of both interactions is considered, which includes data from literature for one-component interactions plus the following binary combinations: hyspin-hexadecane, diesel-hexadecane and diesel-motor oil. Furthermore, a systematic study of two-component interactions with several silicon oils and hexadecane is performed. To map the outcomes, the Ohnesorge number Oh and the Reynolds number Re calculated with arithmetically averaged fluid properties between droplet and wall film fluid are chosen. The dimensionsless film thickness δ is added to form a 3D plot, where one-and two-component experiments are combined. Existing correlations from the literature are revised regarding both interactions and their consistency is checked. The investigated range of high viscosity fluids allow us to propose an improvement of the correlation for high Oh. Our results show that the arithmetically averaged fluid properties lead to a good repartition of both one-and twocomponents interactions toward the deposition/splashing limit. They also corroborate the previous findings that an increase of δ inhibits splashing but its influence is decreasing with increasing Oh. Keywords droplet impact, thin film, two-components interaction, splashing treshold. IntroductionSingle drop impact on a thin liquid layer (i.e. wall film) covers a wide range of industrial applications like coating, printing, cooling or combustion. They are of particular interest since they lead to the ejection of secondary droplets, the so-called splashing.The investigations concerning the droplet impact on wetted walls show that for a given Reynolds number (Re), Ohnesorge number (Oh) and dimensionsless wall film thickness (δ, film thickness h over droplet diameter D), the outcome of one-component droplet impact can be determined. Roughness of the wall can be neglected in the case of 0.1 ≤ δ ≤ 1 [9], when it is completely embedded in the liquid wall film. However, drop-film interactions are affected by the use of different fluids for the droplet and the liquid film. Very little is known for this two-component interaction: the available database is still sparse and therefore the validity of proposed correlations for the deposition/splashing limit cannot be yet generalized to any type of fluid combinations. In this study, we consider a droplet impact of Newtonian fluids onto a wetted, cold, horizontal, solid surface. In the following, the denomination fluid1/fluid2 means that a fluid1 droplet impacts onto a fluid2 wall film and fluid1-fluid2 that both permutations were performed. This study focuses on ...

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Section: Methodssupporting

confidence: 75%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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