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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Jonathan, D. Posner Juan, G. Santiago |
| Copyright Year | 2005 |
| Abstract | Electrokinetic instabilities are generated by a coupling of electric fields and ionic conductivity gradients. This coupling results in an electric body force in the bulk liquid that can generate temporal, convective, and absolute flow instabilities. In this work, we perform a parametric experimental study of convective instabilities in cross-shaped microchannels using epifluorescence microscopy and high speed digital imaging. We report temporal power spectra and spatiotemporal maps as a function of the applied field. The spectral analyses reveal that disturbances induced by electrokinetic instability are purely sinuous at the onset of instability and exhibit higher-order harmonics, frequency bifurcations, and continuous power spectra with increasing electric Rayleigh number. Electrokinetic instabilities (EKI) in cross-shaped channels are relevant to injections for field amplified sample stacking, electrokinetic flows at the intersections in multi-dimensional assay devices, and systems with indeterminate sample chemistry. |
| Sponsorship | Fluids Engineering Division |
| Starting Page | 209 |
| Ending Page | 212 |
| Page Count | 4 |
| File Format | |
| ISBN | 0791842193 |
| DOI | 10.1115/IMECE2005-79845 |
| e-ISBN | 0791837696 |
| Volume Number | Fluids Engineering |
| Conference Proceedings | ASME 2005 International Mechanical Engineering Congress and Exposition |
| Language | English |
| Publisher Date | 2005-11-05 |
| Publisher Place | Orlando, Florida, USA |
| Access Restriction | Subscribed |
| Subject Keyword | Nonlinear dynamics Spectroscopy Electrokinetics Ionic conductivity Bifurcation Rayleigh number Flow (dynamics) Microchannels Chemistry Spectra (spectroscopy) Microscopy Imaging Spatiotemporal phenomena Flow instability Electric fields |
| Content Type | Text |
| Resource Type | Article |
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