Journal
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 22, Issue 2, Pages 382-386Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-007-1025-6
Keywords
microfluidics; instability; electro-osmosis; nano; interface
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Funding
- National Research Foundation of Korea [과C6B1812] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A new hydrodynamic instability is identified for a nanofluidic flow. The flow analyzed is an electro-osmotic flow of a thin liquid layer, bounded below by a solid substrate and above by an inert gas. The Debye-Huckel approximation is used for the potential distribution, and the interface with the gas is treated as a moving boundary. The stability analysis shows that the flow is always unstable to small-wavenumber disturbances, and the instability is accompanied by interface deformations. Neutral stability bounds due to the capillary cut-off are presented in parametric spaces for the electric field strength and the Debye length of the electrolyte.
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