The influences of special wetting surfaces on the dynamic behaviors of underwater oil droplet

Han, Yunrui; Yang, Zhaoming; He, Limin; Luo, Xiaoming; Zhou, Ru; Shi, Kaiyue; Su, Jian-Peng

doi:10.1016/j.colsurfa.2018.01.049

Cited by 26 publications

(16 citation statements)

References 45 publications

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“…The three-phase contact line of the oil droplet underwater was composed of the aqueous phase, the oil phase, and the solid phase. The motion of the three-phase contact line required overcoming the viscous resistance of the aqueous phase, which was different from the rapid spreading of oil droplets on a wall in air . However, because of the difference in surface properties, the spreading of oil droplets on the lipophilic surfaces underwater would be much easier than on the oleophobic surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…The author had carried out detailed experiments and theoretical analysis on the spreading behaviors of oil droplets on surfaces with different wettabilities in a published article. 31 Three surfaces were taken as examples in this section to verify the accuracy of the model. The velocity u r of the oil droplet relative to the wall was controlled by changing the inlet velocity of water flow.…”

Section: Bo Gd (mentioning

confidence: 99%

“…However, Spielman and Goren 30 reported that when the flow rate and oil viscosity were changed in the O/W emulsification system, the water-wetting materials could separate oil more effectively than oil-wetting materials. Han et al 31 studied the spreading behaviors of oil droplets in water on the smooth H62 brass substrate and 316L stainless steel surface from the microscopic point of view. The differences in the spread length and contact angle with time were observed.…”

Section: ■ Introductionmentioning

confidence: 99%

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Migration and Adherence of Oil Droplets on Surfaces with Different Wettability in a Laminar Flow Field

et al. 2019

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In this article, the rising trajectories of oil droplets near the substrates of small channels in the laminar flow field were observed using a high-speed camera. Chemical modifications were made on the surfaces of the brass sheets to change the surface properties, and the controllable regulation of the superoleophilic–superoleophobic wettability gradient was achieved. The adhesion behaviors of the oil droplets on surfaces with different wettabilities at different flow velocities were observed as well. According to the adhesion behaviors of oil droplets on surfaces with different wettabilities, a mathematical model was established to analyze water film thinning and the adherence of oil droplets on the wall in the laminar flow field. Then the quantitative relationships among the adhesion times t f of oil droplets on different wetting surfaces, oil and water properties, and surface wettability were acquired.

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Section: Resultsmentioning

confidence: 99%

Section: Bo Gd (mentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Migration and Adherence of Oil Droplets on Surfaces with Different Wettability in a Laminar Flow Field

et al. 2019

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“…The oleophilic property of a substrate is very conducive to the spread of oil droplets on a solid surface. 35 OPS addition increased the number of C-C/C-H groups on the lowrank coal and increased its hydrophobicity. Hence, the spread of oil droplets on the coal surface was enhanced by OPS.…”

Section: Coal-bubble and Coal-oil Contact Anglesmentioning

confidence: 95%

Enhancement of floatability of low-rank coal using oxidized paraffin soap

Gao

Wang

et al. 2020

RSC Adv.

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“…The droplet velocity was shown to increase with increasing the wettability gradient. Han et al , concentrated on oil droplets spreading on the surface with a superoleophilic–superoleophobic wettability gradient, establishing a mathematical model to analyze water film thinning and adherence of oil droplets on the wall in the laminar flow field through stress analysis and obtaining a quantitative relation among droplet parameters through energy analysis. From the above literature, it is clear that most studies about droplet impact on a hybrid-wettability surface are focused on droplet movement distance.…”

Section: Introductionmentioning

confidence: 99%

Droplet Wetting Propagation on a Hybrid-Wettability Surface

Wang

Liang

et al. 2021

Langmuir

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Droplet impinging on the boundary between hydrophilic and hydrophobic regions of a hybrid-wettability surface is studied both experimentally and numerically in the present paper. The interfacial evolution and dynamic feature and the corresponding underlying mechanisms behind are mainly analyzed. Because of the unbalanced surface energy in the vicinity of a boundary, the droplet undergoes spreading−receding in the hydrophobic region before migration toward the hydrophilic region. This results in an increase first but then a decrease in the spreading factor in the hydrophobic region, while it increases continuously in the hydrophilic region. In addition, increasing Weber number leads to the increase in both the spreading factor and migration displacement of the droplet in the hydrophobic region, but the latter decreases in the hydrophilic region, resulting from different momentums of secondary spreading. The experimental determinations are verified in detail by a series of numerical simulations performed based on the single variable method by fixing contact angles in different regions separately and excluding the impact momentum. It is shown that the highly unsymmetrical pressure field is exactly one important reason for droplet migration on the hybrid-wettability surface. Despite the weak dependence of the spreading factor on the hydrophilic contact angle in the hydrophobic region, it has an appreciably positive effect on droplet migration, which is confirmed by the increased pressure gradient with its action area in the hydrophobic region when decreasing the hydrophilic contact angle. This paper advances the fundamental understanding for droplet migration on the hybrid-/gradient-wettability surface.

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The influences of special wetting surfaces on the dynamic behaviors of underwater oil droplet

Cited by 26 publications

References 45 publications

Migration and Adherence of Oil Droplets on Surfaces with Different Wettability in a Laminar Flow Field

Migration and Adherence of Oil Droplets on Surfaces with Different Wettability in a Laminar Flow Field

Enhancement of floatability of low-rank coal using oxidized paraffin soap

Droplet Wetting Propagation on a Hybrid-Wettability Surface

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