润湿性图案表面上的液滴侧向弹跳行为

doi:10.11949/0438-1157.20210224

摘要/Abstract

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

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

中图分类号:

TQ 021.4

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.

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.

图/表 16

图1 润湿性图案表面

Fig.1 Wettability-patterned surface

图2 实验系统及实验参数设置示意图

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

表1 实验参数设置

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

图3 液滴撞击表面后的不同形态演变

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

图4 x方向上液滴两侧的速度变化曲线(亲水条纹9 mm×0.3 mm，撞击偏移距离2 mm,撞击高度20 mm)

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)

图5 数值计算模型及验证

Fig.5 Numerical calculation model and verification

图6 撞击液滴内部的压力分布云图(亲水条纹9 mm×0.3 mm，撞击偏移距离2 mm、撞击高度20 mm)

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)

图7 液滴撞击表面不同位置分裂质量对比

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

图8 液滴撞击表面不同位置运动行为对比(亲水条纹9 mm×0.3 mm，撞击高度30 mm)

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)

图9 不同偏移距离N液滴撞击表面与亲水条纹接触面积示意图(亲水条纹9 mm×0.3 mm，撞击高度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)

图10 液滴转动示意图

Fig.10 Schematic diagram of droplet rotation

图11 液滴撞击不同亲水条纹表面分裂质量对比

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

图12 液滴与亲水条纹接触面积示意图

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

图13 液滴速度与分裂质量、弹跳距离的关系(亲水条纹9 mm×0.3 mm，撞击偏移距离2 mm)

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

图14 撞击液滴和亲水区域接触面积与液滴最大铺展面积之比(亲水条纹9 mm×0.3 mm，撞击偏移距离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)

图15 分裂液滴x方向平均速度图(亲水条纹9 mm×0.3 mm，撞击偏移距离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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