On the maximal spreading of impacting compound drops
On the maximal spreading of impacting compound drops
复制标题
关于冲击化合物滴的最大扩散
DOI:
10.1017/jfm.2018.702
复制
发表时间:
2018-09
影响因子:
3.7
通讯作者:
Ding H.
中科院分区:
文献类型:
--
作者:
Liu H-R;Zhang C-Y;Gao P.;Lu X-Y;Ding H.
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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DOI:
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影响因子:
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