Droplets impact on textured surfaces: Mesoscopic simulation of spreading dynamics
Droplets impact on textured surfaces: Mesoscopic simulation of spreading dynamics
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液滴对纹理表面的影响：扩散动力学的细观模拟
DOI：
10.1016/j.apsusc.2014.11.148
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发表时间：
2015-02
影响因子：
6.7
通讯作者：
Chen Shuo
中科院分区：
文献类型：
--
作者：
Wang Yuxiang;Chen Shuo
超疏水表面因其优异的疏水性能而备受关注。本文以理想Cassie状态下的液滴为研究对象，采用多体耗散粒子动力学方法，研究了液滴撞击织构表面的机理。采用三个线性权函数的固-流相互作用来产生不同的润湿性，并引入一种简单而有效的方法来计算接触角。模拟结果表明，当接触角α较小时，静态接触角与Cassie-Baxter公式吻合较好，但当接触角α较大时，静态接触角与Cassie-Baxter公式偏差较大，这与Cassie-Baxter理论公式中没有考虑接触角滞后效应有关。此外，高冲击速度可在具有较大的粗糙度SandFa的织构表面上引起大的接触角滞后。模拟了典型的扩散直径随时间的演化过程，并从能量转换的角度进行了分析。这些结果还表明，液滴的动力学特性，如反弹或钉扎、接触时间和最大铺展直径，在很大程度上取决于材料的润湿性、柱的分数和液滴的冲击速度的综合影响。
Superhydrophobic surfaces have attracted much attention due to their excellent water-repellent property. In the present study, droplets in the ideal Cassie state were focused on, and a particle-based numerical method, many-body dissipative particle dynamics, was employed to explore the mechanism of droplets impact on textured surfaces. A solid–fluid interaction with three linear weight functions was used to generate different wettability and a simple but efficient method was introduced to compute the contact angle. The simulated results show that the static contact angle is in good agreement with the Cassie–Baxter formula for smaller ∅SandFa, but more deviation will be produced for larger ∅SandFa, and it is related to the fact that the Cassie–Baxter theory does not consider the contact angle hysteresis effect in their formula. Furthermore, high impact velocity can induce large contact angle hysteresis on textured surfaces with larger ∅SandFa. The typical time-based evolutions of the spreading diameter were simulated, and they were analyzed from an energy transformation viewpoint. These results also show that the dynamical properties of droplet, such as rebounding or pinning, contact time and maximum spreading diameters, largely depend on the comprehensive effects of the material wettability, fraction of the pillars and impact velocities of the droplets.
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影响因子：
2.3
作者：
Nosonovsky, Michael;Bhushan, Bharat
通讯作者：
Bhushan, Bharat
影响因子：
3.9
作者：
Jung, Yong Chae;Bhushan, Bharat
通讯作者：
Bhushan, Bharat
影响因子：
3.9
作者：
Deng, Xu;Schellenberger, Frank;Butt, Hans-Juergen
通讯作者：
Butt, Hans-Juergen
影响因子：
3.7
作者：
Lagubeau, Guillaume;Fontelos, Marco A.;Petitjeans, Philippe
通讯作者：
Petitjeans, Philippe
影响因子：
7.5
作者：
C. Rodrigues;Jorge M M Barata-Jorge-M-M-Barata-70671413;André R. R. Silva-André-R.-R.-Silva-48404723
通讯作者：
C. Rodrigues;Jorge M M Barata-Jorge-M-M-Barata-70671413;André R. R. Silva-André-R.-R.-Silva-48404723