Non-coalescence of oppositely charged drops
Fluid Dynamics
2015-05-14 v1
Abstract
Oppositely charged drops have long been assumed to experience an attractive force that favors their coalescence. In this fluid dynamics video we demonstrate the existence of a critical field strength above which oppositely charged drops do not coalesce. We observe that appropriately positioned and oppositely charged drops migrate towards one another in an applied electric field; but whereas the drops coalesce as expected at low field strengths, they are repelled from one another after contact at higher field strengths. Qualitatively, the drops appear to `bounce' off one another. We directly image the transient formation of a meniscus bridge between the bouncing drops.
Keywords
Cite
@article{arxiv.0910.3273,
title = {Non-coalescence of oppositely charged drops},
author = {W. D. Ristenpart and J. C. Bird and A. Belmonte and F. Dollar and H. A. Stone},
journal= {arXiv preprint arXiv:0910.3273},
year = {2015}
}
Comments
Gallery of fluid motion entry for 2009 APS DFD meeting