Impact of viscous droplets on different wettable surfaces: Impact phenomena, the maximum spreading factor, spreading time and post-impact oscillation

Lin, Shiji; Zhao, Binyu; Zou, Song; Guo, Jingxia; Zheng, Wei; Chen, Longquan

doi:10.1016/j.jcis.2017.12.086

Cited by 230 publications

(143 citation statements)

References 56 publications

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“…The general range of the critical impact velocities is 2-2.5 m/s. It correlates well with findings [19] describing the stable breakup at a velocity of higher than 2.12 m/s. The snapshots of the tests depicted the common pattern in the range of initial drop sizes of up to 1.5-2 mm: the larger the droplet, the lower impact velocity required for its breakup.…”

Section: Rd [Mm]supporting

confidence: 90%

The Impact of Single- and Multicomponent Liquid Drops on a Heated Wall: Child Droplets

et al. 2020

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This paper presents the experimental research into the impingement of single-and multicomponent liquid drops on a solid wall. We focus on studying the conditions and characteristics of two impact scenarios: rebound and breakup. We performed a comprehensive analysis of the effect of a group of factors on the drop transformation and fragmentation characteristics. These factors include the drop velocity and size, Weber number, impinging angle, wall temperature, thermophysical properties of the wall material, surface roughness, hydrophilic and hydrophobic behavior of the surface, homogeneity and inhomogeneity of the drop composition, as well as viscosity and surface tension of the liquid. We compared the outcomes of one, two, and three drops with the same total volume on a wall. Histograms were plotted of the number and size distribution of the emerging secondary droplets. The results include the critical conditions for the intense breakup of drops. Such factors as wall heating, its roughness, impinging angle, drop size and velocity affected the breakup conditions most notably. The variation of a group of these factors could provide a 2-25-fold increase in the liquid surface area as a result of the impact. up after impinging on the surface. If We < 30, drop rebound took place. At 50 < We < 80, the drop spread over the surface and the resulting lamella disintegrated to form secondary droplets. Moreover, Liang and Mudawar [1] demonstrated the snapshots illustrating details of the drop spreading over a heated surface.The contact time of a drop with a surface also depends on its hydrophobicity. For example, Tang et al. [5] studied the behavior of a water drop when interacting with superhydrophobic surfaces in the presence of a cold airflow. Experimental studies were carried out at an ambient temperature ranging from −10 • C to 30 • C to investigate the effect of the airflow on a water drop. In the case of superhydrophobic surfaces, a decrease in the contact time of a drop with a surface was observed.Liang and Mudawar [2] and Šikalo et al.[3] studied heat transfer mechanisms when a drop impinged on a heated surface. An increase in the impact velocity accelerated the spreading velocity during film boiling. In turn, this led to a decrease in the size of secondary droplets. However, the elevated viscosity contributed to an increase in the size of secondary droplets, while a reduction in the surface roughness decreased their size by more than 15%. Moreover, the factor of changing an impingement angle was examined. In particular, the size of child droplets did not depend much on the impingement angle, when it was ϕ > 45 • . However, at ϕ < 15 • , secondary droplets became much smaller.An experimental study by Clavijo et al. [6] considered the effect of the surface inclination angle on the propagation dynamics of a drop over the surface after an impact. After the drop spreads and reaches its maximum diameter, reverse processes occur, i.e., a drop is formed from the film. For example, a surface slope angle of 67.4 • provides ma...

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Section: Rd [Mm]supporting

confidence: 90%

The Impact of Single- and Multicomponent Liquid Drops on a Heated Wall: Child Droplets

et al. 2020

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“…Considering the effects of viscosity and surface tension, Lin et al [18] performed a series of experiments at different Weber numbers, and promoted a universal scaling law of spreading time. The mesoscopic simulation on spreading diameter was accomplished in Wang and Chen's work [19].…”

Section: Introductionmentioning

confidence: 99%

Spreading Dynamics of Droplet Impact on a Wedge-Patterned Biphilic Surface

Yang

Chen²,

Huang³

2019

Applied Sciences

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The influence of apex angle and tilting angle on droplet spreading dynamics after impinging on wedge-patterned biphilic surface has been experimentally investigated. Once the droplet contacts the wedge-patterned biphilic surface, it spreads radially on the surface, with a tendency toward a more hydrophilic area. After reaching the maximum spreading diameter, the droplet contracts back. From the experimental results, the normalized diameter β ( β = D / D 0 ) was found to be related with the Weber number ( W e = ρ D V 2 / γ ) as β max ∼ W e 1 / 5 . during the first spreading process. Below 67.4°, a larger apex angle can help a droplet to spread on the surface more quickly. The maximum spreading diameter has a tendency to increase with the Weber number, and then decrease after the Weber number, beyond 2.7. Approximately, the critical Weber number is about 5, when the droplet lifts off the surface. Considering the effect of apex angle, the maximum normalized spreading diameter has a rough expression as β ∼ α τ

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“…The ink-jet printing primly preferred a simple droplet deposit (de Gans and Schubert 2003)without other complications such as partial or complete bouncing off and air bubble entrapment. (Lin et al 2018) To ensure this goal, the wettability of the printing substrate is as important as ink material properties. Because with the hydrophobicity of printing substrate directly affects the likelihood of ink droplet contact along with the ink surface tension, which can be characterized by contact angle by the following equation (Owens and Wendt 1969):…”

Section: Chapter 4 Performance and Optimizationmentioning

confidence: 99%

“…If the ink liquid had a significantly high surface tension, high viscosity is also required to provide droplets deposition. (Lin et al 2018) On the other perspective, the printing conditions impact the jetting process as well as the impacting process. (Aboud and Kietzig 2015;Mao, Kuhn, and Tran 1997) High impact velocity tends to result in rebounding when the contact angle is high between impacting surface and ink liquid, (Mao, Kuhn, and Tran 1997) smaller nozzle with reduced weber number deliver good deposit preventing the situation of rebounding or splashing.…”

Section: Chapter 4 Performance and Optimizationmentioning

confidence: 99%

“…(Aboud and Kietzig 2015;Mao, Kuhn, and Tran 1997) High impact velocity tends to result in rebounding when the contact angle is high between impacting surface and ink liquid, (Mao, Kuhn, and Tran 1997) smaller nozzle with reduced weber number deliver good deposit preventing the situation of rebounding or splashing. (Aboud and Kietzig 2015;Lin et al 2018) Silver Ink Printing Performance and Optimization…”

Section: Chapter 4 Performance and Optimizationmentioning

confidence: 99%

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Metallic nanoparticle ink formulation development and optimization for electrohydrodynamic ink-jet printing

Huang¹

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Impact of viscous droplets on different wettable surfaces: Impact phenomena, the maximum spreading factor, spreading time and post-impact oscillation

Cited by 230 publications

References 56 publications

The Impact of Single- and Multicomponent Liquid Drops on a Heated Wall: Child Droplets

The Impact of Single- and Multicomponent Liquid Drops on a Heated Wall: Child Droplets

Spreading Dynamics of Droplet Impact on a Wedge-Patterned Biphilic Surface

Metallic nanoparticle ink formulation development and optimization for electrohydrodynamic ink-jet printing

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