Lateral bouncing behavior of droplets on the wettability-patterned surface

doi:10.11949/0438-1157.20210224

Abstract

Abstract:

The non-uniform surface wettability can affect the movement behavior of the droplet after droplet impacts the surface. When the droplet impacts the wettability-patterned surface, the lateral bounce of the droplet can be achieved by using the hydrophobic surface decorated with ahydrophilic stripe. During the experiment, the influence of different surface properties and impact conditions on the lateral bounce behavior of the droplet was explored, which provided a new idea for the realization of the directional bounce of the droplet. The results showed that the wettability pattern mainly affected the retraction process of the droplet after it impacted the surface. And the pattern size, droplet velocity, and droplet impact position can affect the splitting and lateral bounce of the impacting droplet. Through experiments, the influence of the above parameters on the mass and distance of the droplet's lateral bounce is obtained.

Key words: surface, multiphase flow, hydrodynamics, droplet impact, lateral bounce

摘要：

表面润湿性不均匀会影响液滴撞击表面后的运动行为。通过液滴撞击润湿性图案表面，利用疏水表面上的亲水条纹可以实现液滴的侧向弹跳。实验过程中探究了不同的表面性质与撞击条件对液滴侧向弹跳运动行为的影响，为实现液滴定向弹跳提供了新的思路。实验结果表明，润湿性图案主要影响液滴撞击表面后的回缩过程，并且图案尺寸、液滴速度、液滴撞击位置均会对液滴撞击表面后的分裂以及侧向弹跳产生影响。通过实验获得了上述参数对液滴侧向弹跳的质量和距离的影响规律。

关键词: 表面, 多相流, 流体动力学, 液滴撞击, 侧向弹跳

CLC Number:

TQ 021.4

Hui REN, Hong WANG, Xun ZHU, Rong CHEN, Qiang LIAO, Yudong DING. Lateral bouncing behavior of droplets on the wettability-patterned surface[J]. CIESC Journal, 2021, 72(8): 4255-4266.

任辉, 王宏, 朱恂, 陈蓉, 廖强, 丁玉栋. 润湿性图案表面上的液滴侧向弹跳行为[J]. 化工学报, 2021, 72(8): 4255-4266.

Figures/Tables 16

Fig.1 Wettability-patterned surface

Fig.2 Schematic view of the experimental setup and experimental parameters setting

Table 1 Experimental parameters setting

条纹尺寸	针管高度	偏移距离N
9 mm×0.3 mm	10~60 mm	1 mm
9 mm×0.3 mm		2 mm
9 mm×0.5 mm		2 mm
9 mm×0.5 mm		3 mm

Fig.3 Different morphological evolution of droplets after impacting the surface

Fig.4 The velocity change curve on both sides of the droplet in the x direction (hydrophilic stripe: 9 mm×0.3 mm, N=2 mm, impact height: 20 mm)

Fig.5 Numerical calculation model and verification

Fig.6 The pressure distribution cloud diagram inside the impacting droplet (hydrophilic stripe: 9 mm×0.3 mm, N=2 mm, impact height: 20 mm)

Fig.7 Comparison of split-mass of droplet impacting surface at different positions

Fig.8 Comparison of the motion behavior of the impact droplet at different positions on the surface (hydrophilic stripe: 9 mm×0.3 mm, impact height: 30 mm)

Fig.9 The contact area between impact droplet and hydrophilic stripe on the surface at different offset distances (hydrophilic stripe: 9 mm×0.3 mm, impact height: 30 mm)

Fig.10 Schematic diagram of droplet rotation

Fig.11 Comparison of surface split-mass of droplet impacting on different hydrophilic fringes

Fig.12 Schematic diagram of the contact area between droplets and hydrophilic stripes

Fig.13 The relationship between droplet velocity and split-mass / bounce distance (hydrophilic stripe: 9 mm×0.3 mm, N=2 mm)

Fig.14 The ratio of the contact area between the impact droplet and the hydrophilic area to the maximum spread area of the droplet (hydrophilic stripe: 9 mm×0.3 mm, N=2 mm)

Fig.15 The average velocity of the split droplet in the?x?direction (hydrophilic stripe: 9 mm×0.3 mm, N=2 mm)

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