液滴冲击过程动态接触角模型研究

王翔宇; 柯鹏; 杜锋

doi:10.21656/1000-0887.440282

液滴冲击过程动态接触角模型研究

doi: 10.21656/1000-0887.440282

王翔宇^1,,
柯鹏^{1, 2},
杜锋^{1, 2, ,}

1.
北京航空航天大学交通科学与工程学院, 北京 102206
2.
杭州市北京航空航天大学国际创新研究院(北京航空航天大学国际创新学院)，杭州 311115

基金项目:

国家自然科学基金 12372095

详细信息

作者简介:
王翔宇(1999—)，男，硕士生(E-mail: zy2213412@buaa.edu.cn)

通讯作者:
杜锋(1987—)，男，副教授，博士(通讯作者. E-mail: fengdu@buaa.edu.cn)

中图分类号: O359⁺.1
计量
- 文章访问数: 264
- HTML全文浏览量: 110
- PDF下载量: 73
- 被引次数: 0
出版历程
- 收稿日期: 2023-09-20
- 修回日期: 2024-06-20
- 刊出日期: 2024-09-01

Research on the Dynamic Contact Angle Model for the Droplet Impact Process

WANG Xiangyu^1
,,
KE Peng^{1, 2},
DU Feng^{1, 2
, ,}

1.
School of Transportation Science and Engineering, Beihang University, Beijing 102206, P.R.China
2.
Hangzhou International Innovation Institute, Beihang University, Hangzhou 311115, P.R.China

摘要

摘要: 基于计算流体力学(CFD)模拟液滴冲击壁面，对于理解液滴在固体壁面铺展的动力学行为有重要的意义，可以为超疏水结构设计及防除冰涂层开发提供技术支撑，其中的难点在于如何在模型中准确刻画接触线及动态接触角的演化过程. 总结了四种典型的动态接触角模型，从理论上分析了其应用范围，借助FLUENT中的UDF功能，将动态接触角模型应用于壁面边界条件. 首先对液滴冲击光滑壁面的动力学过程进行了数值模拟研究，通过定量分析液滴形态的各项参数变化并与实验结果对比表明，Seebergh动态接触角模型更适用于模拟低毛细数下液滴的运动，Kistler模型与Jiang模型应用范围更广并且可以较准确地描述高毛细数下液滴的运动. 随后基于Kistler动态接触角模型，对液滴在微结构表面的冲击与铺展过程进行了仿真研究，发现应用动态接触角模型会导致液滴内部流场在表面张力起主导作用的阶段内发生变化，并且在平衡状态下液滴接触角的模拟值与理论值相近.
- 液滴冲击 /
- 动态接触角 /
- 铺展系数 /
- 高度系数 /
- 微结构壁面
Abstract: The simulation of droplet-wall impact process based on computational fluid dynamics (CFD) is of great significance for understanding the dynamic behavior of droplets spreading on the solid wall, and can provide technical support for the design of superhydrophobic structures and the development of anti-icing coating. The difficulty lies in how to accurately describe the evolution process of the contact line and the dynamic contact angle in the model. Herein, 4 typical dynamic contact angle models were summarized, and their application ranges were analyzed theoretically. With the UDF function in FLUENT the dynamic contact angle model was applied to the wall boundary conditions, and the dynamic process of droplet impact on smooth wall was numerically simulated. The quantitative analysis of the changes of droplet shape parameters and the comparison with the experimental results show that, the Seebergh dynamic contact angle model is more suitable for simulating the motion of droplets with lower capillary numbers. The Kistler model and the Jiang model are more widely used and can accurately describe the motions of droplets with higher capillary numbers. Then, based on the Kistler dynamic contact angle model, the impact and spreading processes of droplets on the microstructure surface were simulated. It is found that, the application of the dynamic contact angle model will lead to the change of the internal flow fields of droplets with the surface tension playing a dominant role, and the simulated droplet contact angle value in equilibrium is close to the theoretical value.
- droplet impact /
- dynamic contact angle /
- spreading coefficient /
- height coefficient /
- microstructure wall

HTML全文

图 1 不同平衡接触角下Ca与θ_D的对应关系

注为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.

Figure 1. The relationships between Ca and θ_D under different equilibrium contact angles

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图 2 物理模型及网格示意图

Figure 2. The physical model and the grid

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图 3 在工况1中采用Kistler模型模拟所得结果与实验对比

Figure 3. Comparison between simulation results and experiments in condition 1 with the Kistler model

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图 4 工况1中D/D₀与H/D₀随时间变化曲线

Figure 4. The variations of D/D₀ and H/D₀ with time in condition 1

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图 5 工况3中D/D₀与H/D₀随时间变化曲线

Figure 5. The variations of D/D₀ and H/D₀ with time in condition 3

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图 6 工况4中D/D₀与H/D₀随时间变化曲线

Figure 6. The variations of D/D₀ and H/D₀ with time in condition 4

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图 7 四种模型在工况3、4、5中模拟所得D/D₀与H/D₀随时间变化曲线

Figure 7. The time variations of D/D₀ and H/D₀ simulated with 4 models in conditions 3, 4 and 5

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图 8 采用Kistler模型与Jiang模型在工况2、6、7中模拟所得接触角随时间变化曲线

Figure 8. The temperal variations of contact angles simulated with the Kistler and Jiang models in conditions 2, 6 and 7

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图 9 采用Kistler模型与Jiang模型在工况6中模拟所得D/D₀与H/D₀随时间变化曲线

Figure 9. The temperal variations of D/D₀ and H/D₀ simulated with the Kistler and Jiang models in condition 6

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图 10 环形槽状微结构仿真模型与平衡接触角测量值

Figure 10. The physical model for the annular groove microstructure and the measurement of the equilibrium contact angle

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图 11 应用Kistler动态接触角模型计算工况8液滴冲击过程内部流场云图

Figure 11. Internal flow field contours of the droplet impact process in condition 8 with the Kistler model

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图 12 静态与动态接触角模型局部涡流对比

Figure 12. Comparison of local eddy currents between static and dynamic contact angle models

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图 13 降低We数后静态与动态接触角模型局部涡流对比

Figure 13. Comparison of local eddy currents between static and dynamic contact angle models with a lower We number

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图 14 降低本征接触角后静态与动态接触角模型局部涡流对比

Figure 14. Comparison of local eddy currents between static and dynamic contact angle models with a lower θ_Y value

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图 15 三维方柱微结构仿真模型与多面体网格

Figure 15. The 3-D square column microstructure simulation model with polyhedral meshes

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图 16 液滴发生煎饼弹跳过程与实验对比

Figure 16. Comparison of the pancake bouncing processes of the droplet between the simulation and the experiment

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图 17 文献[25]实验工况下D/D₀与H/D₀计算结果

Figure 17. Calculations of D/D₀ and H/D₀ under experimental conditions in ref. [25]

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图 18 4 ms与7.5 ms时液滴轮廓及内部流场

Figure 18. Droplet profiles and internal flow fields at 4 ms and 7.5 ms

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表 1 计算工况

Table 1. Calculation conditions

condition	wall	liquid	diameter D₀/mm	impact velocity v/(m/s)	contact angle θ/(°)	We	Re	Ca
1	plane	water	2.45	1.64	105，95	90.0	4 010	0.023
2		glycerol	2.45	1.41	97，90	94.0	36	2.590
3		water	2.47	0.21	63.4	1.5	523	0.003
4		water	2.47	0.21	100	1.5	523	0.003
5		water	2.47	0.21	160	1.5	523	0.003
6		glycerol	2.45	1.41	17，13	94.0	36	2.590
7		glycerol	2.45	1.41	160	94.0	36	2.590
8	micro structure	water	2.00	1.00	165，155	27.0	2 000	0.014
8		water	2.00	0.50	165，155	13.5	1 000	0.007
10		water	2.00	1.00	95，85	27.0	2 000	0.014
11		water	2.90	0.34	165，155	4.7	984	0.005

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