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| Naji, M. |
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| Azevedo, Nuno Monteiro |
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| Rignanese, Gian-Marco |
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Green, Nicolas G.
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Publications (9/9 displayed)
- 2022Particle-induced electrostatic repulsion within an Electric Curtain Operating below the Paschen Limitcitations
- 2018Controlling the phase transition of vanadium oxide using plasmonic metamaterials
- 2008Electrothermal liquid motion in microsystems subjected to alternating and rotating electric fieldscitations
- 2008Analytical and numerical modeling methods for impedance analysis of single cells on-chipcitations
- 2006Experiments on AC electrokinetic pumping of liquids using arrays of microelectrodescitations
- 2004Numerical simulation of travelling wave induced electrothermal fluid flowcitations
- 2003Electrohydrodynamics and dielectrophoresis in microsystems: scaling lawscitations
- 2002Manipulation of bio-particles in microelectrode structures by means of non-uniform ac electric fieldscitations
- 2000Electric field induced fluid flow on microelectrodes: the effect of illuminationcitations
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document
Electrothermal liquid motion in microsystems subjected to alternating and rotating electric fields
Abstract
Electrothermal motion in an aqueous solution appears when an electric field is coupled with thermally-induced gradients of conductivity and permittivity in the fluid. The temperature field can be produced by external sources, such as strong illumination, or caused by the applied electric field through Joule heating. Electrothermal flow in microsystems is usually important at frequencies around 1 MHz and voltages around. 10 V. In this work, we consider first the two-dimensional problem of an aqueous solution placed on top of two co-planar electrodes that are subjected to an ac potential difference when there is either a vertical or horizontal temperature gradient. Secondly, we study the three-dimensional problem of an aqueous solution lying on four co-planar electrodes which produce a rotating field. This electric field when combined with a vertical temperature gradient rotates the liquid. The resulting electric field an liquid motion in these problems are characterised using self-similar solutions. Finally, these analytical solutions are compared with numerical and experimental results.