Self-excited oscillatory dynamics of capillary bridges in electric fields

Klingner, Anke and Herminghaus, Stephan and Mugele, Frieder (2003) Self-excited oscillatory dynamics of capillary bridges in electric fields. Applied Physics Letters, 82 (23). pp. 4187-4189. ISSN 0003-6951

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Abstract:	We studied the stability of capillary bridges between flat, parallel, and dielectrically coated electrodes as a function of the voltage applied between them. The stability limits of the capillary bridge state and the state consisting of two separated droplets are shifted with respect to ordinary capillary hysteresis at zero voltage. Surprisingly, we found that the system can oscillate periodically between the two states within a certain range of applied voltage and electrode separation. These oscillations could be applied to promote mixing in electrowetting-based microfluidic devices. We present a model based on the balance between interfacial and electrostatic energies, which explains the experimental findings quantitatively
Item Type:	Article
Copyright:	© 2003 American Institute of Physics
Faculty:	Science and Technology (TNW)
Research Group:	Physics of Complex Fluids (PCF)
Link to this item:	http://purl.utwente.nl/publications/57234
Official URL:	http://dx.doi.org/10.1063/1.1580995
Publisher URL:	http://link.aip.org/link/?APPLAB/82/4187/1
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