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- Title
Vortex Formation and Separation from the Surface of a Charged Dielectric Microparticle in a Strong Electric Field.
- Authors
Frants, E. A.; Artyukhov, D. A.; Kireeva, T. S.; Ganchenko, G. S.; Demekhin, E. A.
- Abstract
—The motion of a charged dielectric microparticle in an electric field is first studied over a wide parameter range on the base of the numerical solution of the system of Nernst–Planck–Poisson–Stokes equations. As the most important result, the formation of microvortices on the rear side of the particle is revealed. The microvortices lose their steadiness with increase in the electric field strength and separate periodically from the particle surface. Separation becomes chaotic with further increase in the electric field strength. The phenomenon strongly resembles the formation of the Kármán street but it has another physical mechanism by virtue of almost zero Reynolds numbers of micro- and nanoparticle flow. The asymptotic analysis is carried out and the mechanism of microvortex formation and separation is theoretically substantiated at small Debye numbers.
- Subjects
NERNST-Planck equation; DEBYE'S theory; FLUID velocity measurements; NONEQUILIBRIUM flow; MICROFLUIDICS; THERMAL stresses
- Publication
Fluid Dynamics, 2021, Vol 56, Issue 1, p134
- ISSN
0015-4628
- Publication type
Article
- DOI
10.1134/S0015462821010043