@Article{CiCP-10-453,
author = {Jian-Jun Xu, Zhilin Li, John Lowengrub and Hongkai Zhao},
title = {Numerical Study of Surfactant-Laden Drop-Drop Interactions},
journal = {Communications in Computational Physics},
year = {2011},
volume = {10},
number = {2},
pages = {453--473},
abstract = {<p style="text-align: justify;">In this paper, we numerically investigate the effects of surfactant on drop-drop
interactions in a 2D shear flow using a coupled level-set and immersed interface
approach proposed in (Xu et al., J. Comput. Phys., 212 (2006), 590–616). We find that
surfactant plays a critical and nontrivial role in drop-drop interactions. In particular,
we find that the minimum distance between the drops is a non-monotone function of
the surfactant coverage and Capillary number. This non-monotonic behavior, which
does not occur for clean drops, is found to be due to the presence of Marangoni forces
along the drop interfaces. This suggests that there are non-monotonic conditions for
coalescence of surfactant-laden drops, as observed in recent experiments of Leal and
co-workers. Although our study is two-dimensional, we believe that drop-drop interactions
in three-dimensional flows should be qualitatively similar as the Maragoni
forces in the near contact region in 3D should have a similar effect.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.090310.020610a},
url = {http://global-sci.org/intro/article_detail/cicp/7450.html}
}