Electrostatic Suppression of the "Coffee-stain Effect"
File(s)
Published version
Author(s)
Wray, AW
Matar, OK
Craster
Sefiane, K
Papageorgiou, DT
Type
Journal Article
Abstract
The dynamics of a slender, nano-particle laden droplet are examined when it is subjected to an electric field. Under a long-wave
assumption, the governing equations are reduced to a coupled pair of nonlinear evolution equations prescribing the dynamics of the
interface and the depth-averaged particle concentration. This incorporates the effects of viscous stress, capillarity, electrostaticallyinduced
Maxwell stress, van der Waals forces, evaporation and concentration-dependent rheology. It has previously been shown27
that electric fields can be used to suppress the ring effect typically exhibited when such a droplet undergoes evaporation. We
demonstrate here that the use of electric fields affords many diverse ways of controlling the droplets.
assumption, the governing equations are reduced to a coupled pair of nonlinear evolution equations prescribing the dynamics of the
interface and the depth-averaged particle concentration. This incorporates the effects of viscous stress, capillarity, electrostaticallyinduced
Maxwell stress, van der Waals forces, evaporation and concentration-dependent rheology. It has previously been shown27
that electric fields can be used to suppress the ring effect typically exhibited when such a droplet undergoes evaporation. We
demonstrate here that the use of electric fields affords many diverse ways of controlling the droplets.
Date Issued
2015-05-28
Date Acceptance
2015-05-09
Citation
Procedia IUTAM, 2015, 15, pp.172-177
ISSN
2210-9838
Publisher
Elsevier
Start Page
172
End Page
177
Journal / Book Title
Procedia IUTAM
Volume
15
Copyright Statement
© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/K041134/1
EP/L020564/1
Publication Status
Published