Drop collisions with simple and complex surfaces

Marengo, Marco; Antonini, Carlo; Roisman, Ilia V.; Tropea, Cameron

doi:10.1016/j.cocis.2011.06.009

Cited by 269 publications

(182 citation statements)

References 89 publications

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“…Droplets may impact on different substrates, solid surfaces, thin liquid films or deep liquid pools in particular, and very different dynamics can be observed, from smooth deposition to violent splashes (Marengo et al 2011). Investigation of drop impact started more than a century ago with the experimental studies of Worthington using pioneering photography techniques at the end of the 19th century (Worthington 1876).…”

Section: Introductionmentioning

confidence: 99%

Two mechanisms of droplet splashing on a solid substrate

et al. 2017

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We investigate droplet impact on a solid substrate in order to understand the influence of the gas in the splashing dynamics. We use numerical simulations where both the liquid and the gas phases are considered incompressible in order to focus on the gas inertial and viscous contributions. We first confirm that the dominant gas effect on the dynamics is due to its viscosity through the cushioning of the gas layer beneath the droplet. We then exhibit an additional inertial effect that is directly related to the gas density. The two different splashing mechanisms initially suggested theoretically are observed numerically, depending on whether a jet is created before or after the impacting droplet wets the substrate. Finally, we provide a phase diagram of the drop impact outputs as the gas viscosity and density vary, emphasizing the dominant effect of the gas viscosity with a small correction due to the gas density. Our results also suggest that gas inertia influences the splashing formation through a Kelvin-Helmoltz like instability of the surface of the impacting droplet, in agreement with former theoretical works.

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Section: Introductionmentioning

confidence: 99%

Two mechanisms of droplet splashing on a solid substrate

et al. 2017

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“…Despite its illusory simplicity, the interaction between a liquid drop and a solid surface during impact is a fascinating fluidics problem, combining a variety of phenomena at multiple temporal and spatial scales [1][2][3][4][5]. These include splash [6][7][8][9][10], phase-change-induced surface levitation [11][12][13][14][15], skating on a film of trapped air [16][17][18], and rebounding [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Contactless prompt tumbling rebound of drops from a sublimating slope

et al. 2016

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We have uncovered a drop rebound regime, characteristic of highly viscous liquids impacting tilted sublimating surfaces. Here the drops, rather than showing a slide, spread, recoil, and rebound behavior, exhibit a prompt tumbling rebound. As a result, glycerol surprisingly rebounds faster than three orders of magnitude less viscous water. When a viscous drop impacts a sublimating surface, part of its initial linear momentum is converted into angular momentum: Lattice Boltzmann simulations confirmed that tumbling owes its appearance to the rapid transition of the internal angular velocity prior to rebound to a constant value, as in a tumbling solid body.

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“…However, the accurate description of its effect is also still far from being completely described. Particularly, rudimentary knowledge is still achieved when complex surfaces with modified topography and/or chemistry are used [5]. This knowledge is even sparser when the complexity of the surfaces includes hierarchical structures, such as those present in biomimetic surfaces, which requires demanding static and dynamic wetting characterization methodologies, as recently reported by [6].…”

Section: Introductionmentioning

confidence: 98%

Time resolved thermographic analysis of droplet impacts onto heated surfaces under extreme wetting scenarios

Pontes

Teodori

Moita³

et al. 2017

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

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The present paper explores the use of time resolved infrared IR thermography combined with high-speed imaging to describe the liquid-surface interfacial heat transfer phenomena occurring at droplet/wall interactions. Custom made calibration and post-processing methods are proposed and discussed. The results show that the methodology proposed captures very well particular details on droplet dynamics and heat transfer, allowing to identify air bubble trapping at the impact region as well as the temperature variations at the formation of the rim. Furthermore, the calibration proposed here allowed amending some physically incorrect results that were often obtained with the IR camera's default calibration. The combined analysis of droplet dynamics (e.g. the spreading factor) with the radial temperature profiles, heat flux and cooling effectiveness computation allowed establishing qualitative and quantitative trends on the effect of various parameters on the heat transfer occurring at droplet/wall interactions. Particularly, the effect of the initial surface temperature is observed to play a minor role, as long as it is low enough to prevent the occurrence of boiling. On the other hand, extreme wetting scenarios, such as superhydrophobicity limit the heat transfer between the spreading droplet and the surface. However, the thermal analysis reveals that a major reason for this is not related to the reduced contact time of the droplet on the surface (due to rebound) or air entrapment, but is rather associated to the reduced wetted area caused by the high contact angles.

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Drop collisions with simple and complex surfaces

Cited by 269 publications

References 89 publications

Two mechanisms of droplet splashing on a solid substrate

Two mechanisms of droplet splashing on a solid substrate

Contactless prompt tumbling rebound of drops from a sublimating slope

Time resolved thermographic analysis of droplet impacts onto heated surfaces under extreme wetting scenarios

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