Postcontact droplet spreading and bubble entrapment on a smooth surface

Zhang, Lige; Soori, Tejaswi; Rokoni, Arif; Sun, Ying

doi:10.1103/physrevfluids.7.104003

Cited by 3 publications

(2 citation statements)

References 81 publications

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“…The interplay of dynamic wetting and gas films also underpins the relation between precontact and postcontact dynamics, explored by Zhang et al (2022) and by de Goede et al ( 2019) under different ambient conditions; the entrapment of gas bubbles during spreading (Thoroddsen et al 2010); the remarkable extreme wetting of liquid bridges that have formed in drop contact spots (Langley et al 2017); the influence of gas on cavity formation when solid spheres impact baths (see Figure 9b) (Duez et al 2007, Williams et al 2022; and the stability of wetting contacts on hot surfaces, which govern Leidenfrost stability (Chantelot & Lohse 2021b).…”

Section: Dynamic Wettingmentioning

confidence: 99%

Gas Microfilms in Droplet Dynamics: When Do Drops Bounce?

Sprittles

2024

Annu. Rev. Fluid Mech.

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In the last ten years, advances in experimental techniques have enabled remarkable discoveries of how the dynamics of thin gas films can profoundly influence the behavior of liquid droplets. Drops impacting onto solids can skate on a film of air so that they bounce off solids. For drop–drop collisions, this effect, which prevents coalescence, has been long recognized. Notably, the precise physical mechanisms governing these phenomena have been a topic of intense debate, leading to a synergistic interplay of experimental, theoretical, and computational approaches. This review attempts to synthesize our knowledge of when and how drops bounce, with a focus on ( a) the unconventional microscale and nanoscale physics required to predict transitions to/from merging and ( b) the development of computational models. This naturally leads to the exploration of an array of other topics, such as the Leidenfrost effect and dynamic wetting, in which gas films also play a prominent role. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 56 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Dynamic Wettingmentioning

confidence: 99%

Gas Microfilms in Droplet Dynamics: When Do Drops Bounce?

Sprittles

2024

Annu. Rev. Fluid Mech.

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“…Weber number We = ρ l U 0 2 D 0 /σ Measuring the relative importance of inertial force and surface tension The ratio of the axial distance between two droplets to the initial diameter [30]. The compression of gas inside the high-speed impacting droplet may exceed the surface tension that encapsulates it, leading to outward bursting and the formation of bubbles ( τ = 0.4 ).…”

Section: Dimensionless Parameters Expression Descriptionsmentioning

confidence: 99%

Numerical study on the thermodynamic behavior of de-icing liquid droplets impacting walls

Cui,

Niu,

Yang

2024

Adv. Aerodyn.

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Spraying de-icing fluid is a key method to ensure the safe operation of aircraft in icy and snowy weather. The film aggregation and internal mixing of de-icing fluid droplets on the aircraft skin during a collision are crucial. Considering the rheological properties of the molecular viscosity change of the de-icing fluid droplets during the collision and the heat transfer model of the heat loss after the impact, the phase field method is used to capture the gas–liquid interface, and a thermal pressure/viscous coupling model is constructed. The thermodynamic behavior of different axial distances is calculated. The results show that, as the dimensionless axial distance of the droplet increases, the spreading length of the fused droplet decreases instead, and the heat transfer rate of the droplet increases with the increase in spreading length. After stabilizing, the increase or decrease in the heat transfer rate depends on the strength of the heat transfer between the liquid layers. As the dimensionless axial distance increases, the internal flow of the droplet weakens and, between the droplet and the wall, the heat flux density gradually decreases and the average temperature drop of the droplet becomes gradual.

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平滑面に衝突する液滴接触線速度のステップ降下

KODAMA,

SHIRAI,

MIYAGAWA

et al. 2023

JAPANESE JOURNAL OF MULTIPHASE FLOW

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Predicting the dynamics of impacting drops is crucial in various industrial applications such as spray and inkjet technologies. Especially in painting technology, the entrapment of air bubbles greatly reduces the product quality. The formation of a thin air film in front of the moving contact line causes the entrapment of air bubbles in the spreading phase. To clarify the main forces acting at the gas-liquid interface that induce air bubbles entrapment, we investigate the contact line velocity of impacting drops by taking bottom view images using the total internal reflection (TIR) method. We used droplets of glycerol or glycerol-ethanol solutions and solid surfaces covered with either glycerol or silicone oil. Our results show the contact line velocity decreased rapidly at 𝑇𝑇 c when a thin air film was formed and settled down at a constant value 𝑉𝑉 const after the formation of the air film. Furthermore, we revealed that drop viscosity affects 𝑇𝑇 c and 𝑉𝑉 const . Moreover, we found that after 𝑇𝑇 c , the lubrication pressure of the air had the same order of magnitude as the viscous shear stress of the drop, which implied the importance of the air lubrication pressure.

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Postcontact droplet spreading and bubble entrapment on a smooth surface

Cited by 3 publications

References 81 publications

Gas Microfilms in Droplet Dynamics: When Do Drops Bounce?

Gas Microfilms in Droplet Dynamics: When Do Drops Bounce?

Numerical study on the thermodynamic behavior of de-icing liquid droplets impacting walls

平滑面に衝突する液滴接触線速度のステップ降下

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