Journal of Aeronautics & Aerospace Engineering
Open Access
ISSN: 2168-9792
+44-77-2385-9429
ISSN: 2168-9792
+44-77-2385-9429
Evgeny A Demekhin
Financial University, Russia
Posters-Accepted Abstracts: J Aeronaut Aerospace Eng
The advent of micro, nano and biotechnologies in the last decade has spurred numerous new and active research areas, in particular, in problems of electro-kinetics. Other than the practical importance of these effects is a theoretical interest to these problems: study of the space charge in the electric double-ion layer is a fundamental problem of modern physics, first addressed by Helmholtz. We shall focus on an often-ignored phenomenon: the underlying very rich hydro-mechanics. The relevant hydrodynamics involves micro-scale vortices, vortex instabilities and even turbulences like eddy fluctuations whose vortex pairing dynamics create a range of vortex sizes, all at miniscule Reynolds numbers. Singularities, instabilities, turbulence, continuum of length scales, self-similar solution, vortex pairing etc., are among the investigated phenomena. Despite their micro and nano-length scales, these instabilities and bifurcations exhibit all the hall marks of other classical hydrodynamic instabilities ΓΆΒ?Β? a sub-harmonic cascade, wide-band fluctuation spectrum and coherent-structure dominated spatio-temporal dynamics. We shall present our results for the one-phase electro-kinetic instability near charge-selective surfaces, influence of this instability on the surface profile, the effect of a coupling between electro-kinetic phenomena and the surface hydrophobicity, Joule heating, geometric confinement, etc. Unstable two-phase liquid-gas flows with a mobile surface charge finalize our investigation. The problems are studied from the view-point of hydrodynamic stability and bifurcation theory using sophisticated asymptotic methods and direct numerical simulations.
Email: edemekhi@gmail.com