Results 151 to 160 of about 1,643 (178)
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The Physics of Fluids, 1961
An electric field can produce steady cellular motions in the interface region of two immiscible semiconducting fluids. The theory of this instability is explored. The characteristic parameter is found to depend upon the difference in conductivity of the fluids and the curvature of the interface.
Malkus, W. V. R., Veronis, G.
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An electric field can produce steady cellular motions in the interface region of two immiscible semiconducting fluids. The theory of this instability is explored. The characteristic parameter is found to depend upon the difference in conductivity of the fluids and the curvature of the interface.
Malkus, W. V. R., Veronis, G.
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Bulk electroconvection in electrolyte
Physical Review E, 2005Bulk electroconvection pertains to flow induced by the action of the mean electric field upon the residual space charge in the macroscopic regions of a locally quasielectroneutral strong electrolyte. There existed a long time controversy in the literature as to whether quiescent electric conduction from such an electrolyte into a uniform charge ...
Tamara, Pundik +2 more
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Flexoelectricity in Electroconvection
Molecular Crystals and Liquid Crystals, 2009We reexamine the influence of the flexoelectricity on the electroconvection (EC), the effect which has previously been studied in the conductive EC regime only. Now we extend our studies to the dielectric EC, and to the parameter range for which the standard model of EC excludes the existence of the instability.
T. Tóth-Katona, N. Éber, Á. Buka
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Bifurcation to worms in electroconvection
Physical Review E, 1999The primary bifurcation to electroconvection of the liquid crystal 4-ethyl-2-fluoro-4'-[2-(trans-4-pentylcyclohexyl)ethyl]-biphenyl (I52) with planar alignment leads to localized structures of convection rolls known as "worms" when the conductivity of the fluid is relatively small. Worms coexist with the conduction state. They have a unique small width
U, Bisang, G, Ahlers
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Propagating transitions of electroconvection
Physical Review A, 1985In a thin dielectric liquid layer, electroconvection can be generated by means of charge injection to the liquid under a vertical electric field. When a parameter which gives the critical condition of the onset of convection is rapidly increased up to some value across the critical point, a propagating transition of the system from the quiescent state ...
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Material characterization for electroconvection
Liquid Crystals, 2002We report a set of material characterizations on the nematic mixture Mischung V. With these measurements, as well as previously known results, Mischung V becomes the second nematic liquid crystal possessing a complete set of known physical parameters relevant for electroconvection, enabling quantitative comparison with theoretical predictions to be ...
J. Shi +4 more
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Isotropic and anisotropic electroconvection
Physics Reports, 2007A systematic overview of various electric-field induced pattern forming instabilities in nematic liquid crystals is given. The standard hydrodynamic description of nematics predicts the occurrence of striped patterns (rolls) in various wavenumber ranges, which depend on the anisotropy of the dielectric permittivity and that of the electrical ...
A BUKA, N EBER, W PESCH, L KRAMER
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On nonisothermal electroconvection
Fluid Dynamics, 1980The flow from the tip of a needle electrode is caused by the Coulomb force acting on the space charge [1–3]. This charge is formed because of the dependence of the conductivity on the temperature, nonuniformity of which is due to Joule heating [1] and the electric field intensity [2] or processes near the electrode [3–5].
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Nematic electroconvection under time-reversed excitation
Physical Review E, 2010We study nematic electrohydrodynamic convection (EHC) under excitation with superimposed harmonic wave forms. Within the standard model for EHC, a time reversal of the excitation does not affect threshold voltages and pattern wavelengths obtained in a linear stability analysis.
Dirk, Pietschmann +2 more
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Electroconvective gas bubble movement
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319), 2003The electroconvective gas bubble movement in the field of plane-parallel capacitor is investigated both experimentally and theoretically. The evolution of a bubble on the stages of growth, separation and surfacing is considered. The system of ordinary differential equations was solved numerically using a modified Hemming's method.
F.M. Sajin, O.V. Motorin
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