Dynamics of oil droplet impacting and wetting on the inclined surfaces with different roughness

Wang, Lingzi; Feng, Jianmei; Dang, Tiendat; Peng, Xueyuan

doi:10.1016/j.ijmultiphaseflow.2020.103501

Cited by 19 publications

(12 citation statements)

References 35 publications

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“…Experimental studies concentrating on radial droplet evolution have been reported in recent times. 13,15 However, the experimental works consist of phenomenological descriptions, which necessitate a detailed analysis. Droplet spread on inclined surfaces is generally defined by the lateral spread factor β la and longitudinal spread factor β lo .…”

Section: ■ Introductionmentioning

confidence: 99%

“…Droplet spread on inclined surfaces is generally defined by the lateral spread factor β la and longitudinal spread factor β lo . 13 Two methods are employed to model the droplet spread on inclined surfaces post impact. The first one is based on the energy argument, which determines the maximum spread of the droplet in the longitudinal direction β lo .…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, experimental evidence forwarded by other researchers suggests that later stages of spread are influenced by gravity forces acting on the droplet fluid if the surface inclination is high. 12,13 In the present work, we report experiments capturing the radial evolution of the droplet lamella post impact on inclined substrates having different wettabilities. With the help of images acquired using a high-speed camera, we plot the temporal spread of the droplet in both longitudinal and lateral directions.…”

Section: ■ Introductionmentioning

confidence: 99%

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Droplet Impact and Spreading on Inclined Surfaces

2021

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Introducing surface inclination in the case of droplet impact on solid substrates results in complicated dynamics post impact. The present work investigates the dynamics involved in the spreading phase of the droplet on inclined substrates. Experiments are conducted with water droplets impinging on inclined dry solid substrates with varying wettability values. The results reveal the presence of three phases in the droplet spread behavior. In the first phase, the droplet is observed to depict a close radial symmetry and is dominated by inertia forces. Phase 1 ends when the upstream droplet lamella post impact gets pinned to the surface or starts retracting as a consequence of surface forces becoming dominant. A scaling analysis developed to predict the pinning time of the droplet shows that the pinning time is independent of impact velocity, which is also observed during experiments. The asymmetries in the radial evolution of the droplet appear in phase 2 and become dominant in phase 3. Phase 2 terminates when the droplet attains the maximum lateral spread, which is established as a function of the normal component of the Weber number. Phase 3 is initiated when the droplet starts retracting in the lateral direction while the longitudinal expansion continues. Using an energy-based model constructed to predict the maximum spread, we show that the impact inertia of the droplet controls the longitudinal droplet spread in phases 1 and 2, while the gravity forces are primarily responsible for the droplet spread in phase 3. The model results were validated with the experiments conducted in-house and were found to be in good agreement.

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Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Droplet Impact and Spreading on Inclined Surfaces

2021

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“…The oblique spreading and retraction give rise to varying pinning forces on the slanted hydrophobic surface because of the alteration of droplet dynamic receding and advancing angles over the surface. 8 The three-phase contact line of the droplet impacting on the slanted hydrophobic surface also differs from that of the impacting droplet on the horizontally located hydrophobic surface. Depending on the droplet size, the contact-line orientation and size change on the slanted surface, which influences the dynamics of the droplet spreading/retraction and rebounding.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In addition, the droplet rebounding characteristics differ from the normal impacting droplet. The oblique spreading and retraction give rise to varying pinning forces on the slanted hydrophobic surface because of the alteration of droplet dynamic receding and advancing angles over the surface . The three-phase contact line of the droplet impacting on the slanted hydrophobic surface also differs from that of the impacting droplet on the horizontally located hydrophobic surface.…”

Section: Introductionmentioning

confidence: 99%

Impacting Water Droplets Can Alleviate Dust from Slanted Hydrophobic Surfaces

et al. 2021

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Water droplet impacting on a slanted dusty hydrophobic surface is examined in relation to dust mitigation from surfaces. Impacting droplet characteristics including droplet spreading/retraction rates, slipping length, and rebound heights are analyzed via high-speed recording and a tracker program. The environmental dust characteristics in terms of size, shape, elemental composition, and surface free energy are evaluated by adopting the analytical methods. The findings reveal that the dynamic characteristics of the impacting droplet on the slanted hydrophobic surface are significantly influenced by the dust particles. The maximum droplet spreading over the dusty surface becomes smaller than that of the nondusty surface. The presence of the dust particles on the slanted hydrophobic surface increases energy dissipation, and the water droplet slipping length over the surface becomes less than that corresponding to the nondusty surface. Impacting droplet fluid infuses over the dust particle surface, which enables mitigation of dust from the surface to the droplet fluid. A dust-mitigated area on the slanted surface is larger than that corresponding to the horizontal surface; in which case, the area ratio becomes almost six-fold, which slightly reduces with increasing Weber number. The optical transmittance of the dust-mitigated surface by the impacting droplet remains high.

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Effect of secondary vulcanization process on hydrophobic properties of fluororubber

Zhang

Wang

et al. 2023

J of Applied Polymer Sci

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In order to study the influence of two-stage vulcanization process on the hydrophobic characteristics of FKM, superhydrophobic surfaces were prepared based on template method (1000 mesh screen, 1600 mesh screen and 2000 mesh screen), and six kinds of FKM with micro-rough surface were prepared by one-stage vulcanization and two-stage vulcanization process, respectively.At first, the influence of two-stage vulcanization process on the physical and

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Dynamics of oil droplet impacting and wetting on the inclined surfaces with different roughness

Cited by 19 publications

References 35 publications

Droplet Impact and Spreading on Inclined Surfaces

Droplet Impact and Spreading on Inclined Surfaces

Impacting Water Droplets Can Alleviate Dust from Slanted Hydrophobic Surfaces

Effect of secondary vulcanization process on hydrophobic properties of fluororubber

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