On the maximal spreading of impacting compound drops

On the maximal spreading of impacting compound drops
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关于冲击化合物滴的最大扩散

DOI:
10.1017/jfm.2018.702
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发表时间:
2018-09
影响因子:
3.7
通讯作者:
Ding H.
Ding H.
中科院分区:
工程技术2区
文献类型:
--
作者:
Liu H-R;Zhang C-Y;Gao P.;Lu X-Y;Ding H.

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我们数值研究的影响,一个化合物滴在疏水性基板上使用三元流体扩散界面方法,旨在了解内部液滴的存在如何影响的传播动力学和最大传播的化合物滴。首先,有趣的是,看到冲击纯液滴的数值结果与Lee等人提出的最大扩展比的通用重新缩放(J.Fluid Mech.,第786卷,2016,R4)。第二,两个流态已被确定为一个影响复合下降:即堵塞蔓延和联合边缘的形成。复合液滴的最大铺展比与内液滴的体积分数α、表面张力比γ、Weber数和流态有关。此外,我们提出了一个通用的重新缩放的最大扩展比的复合液滴,通过整合的一个纯液滴与校正的韦伯数,考虑α,γ和流态。通用重标度的预测是在良好的协议与数值计算结果的冲击复合液滴。
We numerically study the impact of a compound drop on a hydrophobic substrate using a ternary-fluid diffuse-interface method, aiming to understand how the presence of the inner droplet affects the spreading dynamics and maximal spreading of the compound drop. First, it is interesting to see that the numerical results for an impacting pure drop agree well with the universal rescaling of maximal spreading ratio proposed by Lee et al. (J. Fluid Mech., vol. 786, 2016, R4). Second, two flow regimes have been identified for an impacting compound drop: namely jammed spreading and joint rim formation. The maximal spreading ratio of the compound drop is found to depend on the volume fraction of the inner droplet α, the surface tension ratio γ, the Weber number and the flow regime. Moreover, we propose a universal rescaling of maximal spreading ratio for compound drops, by integrating the one for pure drops with a corrected Weber number that takes α, γ and the flow regime into account. The predictions of the universal rescaling are in good agreement with the numerical results for impacting compound drops.
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