Numerical research on the dynamic characteristics of a droplet impacting a hydrophobic tube
Numerical research on the dynamic characteristics of a droplet impacting a hydrophobic tube
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液滴撞击疏水管动力学特性的数值研究
DOI：
10.1063/1.4986526
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发表时间：
2017
影响因子：
4.6
通讯作者：
Zhao Xinyu
中科院分区：
文献类型：
--
作者：
Liu Xiaohua;Zhao Yiming;Chen Shi;Shen Shengqiang;Zhao Xinyu
采用耦合水平集和流体体积法对不同疏水性的圆管表面单液滴撞击的结果进行了数值研究。本文研究的冲击速度分别为0.1 m/s、0.5 m/s、0.94 m/s和1.2 m/s。管表面的接触角分别为107°、120°、135°和153°。研究发现，当冲击速度一定时，表面疏水性的增加不利于液膜在管表面的扩展。表面接触角越大，液滴越有可能发生回弹。在接触角一定的情况下，增大撞击速度有利于液滴在圆管表面的铺展。最后，通过压力场和速度场的分布，解释了液滴撞击接触角为135°的管状表面飞溅和反弹的机理。区别于外部PR…
Numerical researches concerning various outcomes during single liquid droplet impact on tubular surfaces with different hydrophobicity values are carried out using a coupled level set and volume-of-fluid method. The impact velocities studied in this paper are 0.1 m/s, 0.5 m/s, 0.94 m/s, and 1.2 m/s, respectively. The contact angles of the tube surfaces are 107°, 120°, 135°, and 153°, respectively. It is found that, when the impact velocity is constant, the increase of the surface hydrophobicity values is detrimental to the spread of the liquid film on tubular surfaces. The larger the surface contact angle, the more likely the droplet rebound takes place. For a constant contact angle, the increase of the impact velocity is helpful to the droplet spread on a tubular surface. In the end, the mechanism of splashing and rebounding of droplet impact on a tubular surface with the contact angle of 135° is explained through the distribution of the pressure and velocity fields. The difference between the outside pr...