Experimental investigation of a drop impacting on wetted spheres

Liang, Gangtao; Guo, Yali; Mu, Xingsen; Shen, Shengqiang

doi:10.1016/j.expthermflusci.2014.03.008

Cited by 41 publications

(15 citation statements)

References 37 publications

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“…9. Compared to the predictions made by Liang et al (2014), the present splashing threshold of We is generally higher by at least a factor of two. However, there is good qualitative agreement and the trend of splashing threshold appears to be offset between the two investigations.…”

Section: B Mapping Of the Droplet-particle Collision Regimesmentioning

confidence: 68%

“…By using smooth particles, the influence of the surface roughness is low, thus reducing the complexity of the interpretation of the measurements. Also, since research of droplet-particle collisions is generally limited to smooth particles, comparison of the results obtained here with the results of previous investigations [for example, Liang et al (2014) considered particles with surface roughness less than 50 nm] is made possible. Finally, even for investigations with ultimate interest in spray drying applications, smooth glass particles have also been used in the past (Pawar et al, 2016).…”

Section: Experimental Arrangement and Methodsmentioning

confidence: 80%

“…For Ω < 0.224, the critical threshold was reported as a constant at about We = 124, meaning that, if the droplet diameter becomes smaller than about a quarter of the particle diameter, there is little difference in the collision between a droplet and a flat surface. The current results, along with the predictions of Liang et al (2014), which were made for the same range of Ω as here, are shown in Fig. 12 in the domain of Ω and We.…”

Section: B Mapping Of the Droplet-particle Collision Regimesmentioning

confidence: 95%

“…Finally, Liang et al (2014) investigated the splashing threshold of single droplet collisions on wet spheres for Oh = 0.0026 and reported the splashing threshold as a critical Weber number. For Ω > 0.224, the threshold value of We was reported to be a linear function of Ω with a critical value of We increasing with Ω, meaning that smaller targets suppress splashing.…”

Section: B Mapping Of the Droplet-particle Collision Regimesmentioning

confidence: 99%

“…They analysed the temporal and spatial development of the film both experimentally and analytically and classified the development in 3 distinct phases: the initial drop deformation phase, during which the droplet shape remains unaffected by contact with the particle, the inertia dominated phase, for which the viscous forces have little influence, and the viscosity dominated phase, during which the development is governed by the balance of the viscous and gravity forces. Liang et al (2014) investigated experimentally the impingement of droplets with a diameter of about 1.8 mm on solid spheres with a diameter range of 4 mm-20 mm. They found that the splashing threshold is influenced by the solid sphere-drop diameter ratio.…”

Section: Introductionmentioning

confidence: 99%

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Collisions of droplets on spherical particles

Charalampous

Hardalupas

2017

Physics of Fluids

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Head-on collisions between droplets and spherical particles are examined for water droplets in the diameter range between 170 μm and 280 μm and spherical particles in the diameter range between 500 μm and 2000 μm. The droplet velocities range between 6 m/s and 11 m/s, while the spherical particles are fixed in space. The Weber and Ohnesorge numbers and ratio of droplet to particle diameter were between 92 < We < 1015, 0.0070 < Oh < 0.0089, and 0.09 < Ω < 0.55, respectively. The droplet-particle collisions are first quantified in terms of the outcome. In addition to the conventional deposition and splashing regimes, a regime is observed in the intermediate region, where the droplet forms a stable crown, which does not breakup but propagates along the particle surface and passes around the particle. This regime is prevalent when the droplets collide on small particles. The characteristics of the collision at the onset of rim instability are also described in terms of the location of the film on the particle surface and the orientation and length of the ejected crown. Proper orthogonal decomposition identified that the first 2 modes are enough to capture the overall morphology of the crown at the splashing threshold.

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Section: B Mapping Of the Droplet-particle Collision Regimesmentioning

confidence: 68%

Section: Experimental Arrangement and Methodsmentioning

confidence: 80%

Section: B Mapping Of the Droplet-particle Collision Regimesmentioning

confidence: 95%

Section: B Mapping Of the Droplet-particle Collision Regimesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Collisions of droplets on spherical particles

Charalampous

Hardalupas

2017

Physics of Fluids

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Experimental characterization of liquid film behavior during droplets–polyethylene particle collision

et al. 2020

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Nowadays, the droplet–particle collision characteristics in the gas‐phase ethylene polymerization process are still unclear. The high‐speed photography and a quasi‐circle imaging approach are employed to study the collision interaction characteristics between liquid droplets and polyethylene particles. The liquid film evolution is studied through variations of the film thickness on the particle north pole, the dynamic contact angle, center angle and film thickness at the maximum extension. Results have found that for n‐hexane the threshold temperature of the recoil happening increases with increasing initial Weber number, but for 1‐hexene it is stable. Over 70°C evaporation and splash occurs immediately. Under low Weber numbers, the water droplet stays for damping oscillations, the reference stable height of which is linearly related to temperatures. Moreover, three regimes of film thickness variation with time are identified and mathematically described, while Regime 3 characteristics are found strongly dependent on the liquid species, Weber number, and particle temperature.

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