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Bouncing of charged droplets : an explanation using mean curvature flow
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Helmensdorfer, Sebastian and Topping, Peter (2013) Bouncing of charged droplets : an explanation using mean curvature flow. EPL (Europhysics Letters), Volume 104 (Number 3). Article number 34001. doi:10.1209/0295-5075/104/34001 ISSN 0295-5075.
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Official URL: http://dx.doi.org/10.1209/0295-5075/104/34001
Abstract
Two oppositely charged droplets of (say) water in, e.g., oil or air, will tend to drift
together under the influence of their charges. As they make contact, one might expect them to
coalesce and form one large droplet, and this indeed happens when the charge difference is suffi-
ciently small. However, Ristenpart et al. discovered a remarkable physical phenomenon whereby
for large enough charge differentials, the droplets bounce off each other as they make contact.
Explanations based on minimisation of area under a volume constraint have been proposed based
on the premise that consideration of surface energy cannot be sufficient. However, in this letter we
explain that on the contrary, the bouncing phenomenon can be completely explained in terms of
energy, including an accurate prediction of the threshold charge differential between coalescence
and bouncing
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics | ||||
Journal or Publication Title: | EPL (Europhysics Letters) | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0295-5075 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 104 | ||||
Number: | Number 3 | ||||
Page Range: | Article number 34001 | ||||
DOI: | 10.1209/0295-5075/104/34001 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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