2020
DOI: 10.1021/acs.langmuir.0c01733
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Directional Droplet Transport Mediated by Circular Groove Arrays. Part I: Experimental Findings

Abstract: Directional transport of liquid droplets is crucial for various applications including water harvesting, anti-icing, and condensation heat transfer. Here, bouncing of water droplets with patterned superhydrophobic surfaces composed of circular equidistant grooves was studied. The directional transport of droplets toward the pole of the grooves was observed. The impact of the Weber number, initial polar distance r, and geometrical parameters of the surface on the directional droplet bouncing was experimentally … Show more

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Cited by 30 publications
(31 citation statements)
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“…In current researches of directional droplet transport, the lateral offset distance ΔL generally increases with We [14,15]. In this work, ΔL does not monotonically increase with We, and is also related to L. As shown in Fig.…”
Section: Effect Of α On the Lateral Offset Distancementioning
confidence: 57%
See 1 more Smart Citation
“…In current researches of directional droplet transport, the lateral offset distance ΔL generally increases with We [14,15]. In this work, ΔL does not monotonically increase with We, and is also related to L. As shown in Fig.…”
Section: Effect Of α On the Lateral Offset Distancementioning
confidence: 57%
“…Wang et al [13] fabricated a flexible needle-like surface with controllable inclination angle by changing the magnetic field strength, and the horizontal offset distance of the droplet impacting on the surface was different under different inclination angles. Liu et al [14,15] proposed an array of equidistant circular grooves, and realized the directional transport of impinging droplets towards the center of the curvature. Nevertheless, the structures mentioned above are difficult to process and costly.…”
Section: Introductionmentioning
confidence: 99%
“…Besides Weber number, there are other dimensionless numbers that are relevant in describing the impact process, [ 21 ] including Bond number (the ratio of gravitational force to surface tension force, Bo = ρgd 2 /γ), capillary number (the ratio of viscous force to surface tension force, Ca = μU /γ), Reynolds number (the ratio of inertial force to viscous force, Re = ρdU /μ), Ohnesorge number Oh = μ/( ρdγ ) 1/2 = We/Re viscous force/inertia×surface tension, where μ is the viscosity of the drop. With U ≈ 0.5 m s −1 , d = 2.0 mm, and μ = 0.9 mPa s for water drop, Bo ≈ 0.54, Ca ≈ 6.3 × 10 −4 , Re ≈ 1.1 × 10 3 , and Oh ≈ 2.4 × 10 −3 , showing negligible effect of the viscosity on the impact process.…”
Section: Resultsmentioning
confidence: 99%
“…[ 1,2 ] With the development of super‐repellent surfaces, [ 3–12 ] extensive study has been focused on the impact of single drop on them. [ 13–23 ] Efforts are made to reduce one‐time‐bouncing contact time [ 24–26 ] between the impacting drop and the surface by surface structures like macrotexture, [ 25,27,28 ] tapered posts, [ 29,30 ] curved structure [ 31 ] or waterbowls structure. [ 32 ] However, continuous impact of drops causes subsequent drop impacting on static drop first, instead of the super‐repellent surface.…”
Section: Introductionmentioning
confidence: 99%
“…However, a 10 μL water droplet could not rebound from the PI‐S surface and retract fully after achieving maximum contact with the surface. The rebound time depends strongly on the Weber number ( We ) [20,21], which is related to the density ( ρ ), the diameter ( D 0 ) and initial impact velocity ( v 0 ) of the droplets, and the liquid–vapour interface tension ( γ LV ) as follows: We=ρD0v02γLV…”
Section: Resultsmentioning
confidence: 99%