Group of Electrohydrodynamics and Cohesive Granular Media
University of Seville, Faculty
of Physics, Department of Electronics and Electromagnetism
Español/English
Keywords:
electrohydrodynamics, electroconvection, dimensionless electromagnetism,
galilean limits of electromagnetism, AC electroosmosis, surface electric
waves, electrified liquid bridges and jets,
fluids, EHD turbulence,
surface tension, microgravity, electrocapillar instability,
parametric resonance, magnetohydrodynamics, formation of drops,
unipolar injection, diffusion, repulsion of Coulomb, chaos, doubling of the
period, electric relaxation time, electric force,
electrophoretic mobility, non-polar media,
dielectrophoresis, electrothermal flow, microsystem, microelectrodes,
micropumps, cone of Taylor, equilibrium shapes,
electrohydrodynamic plume,
particle methods, topography of surfaces,
STM,
Particle-in-Cell, numeric diffusion,
hyperbolic equation, plasma chemistry, colloidal dispersion,
electrostatics,
equations of Poisson and Laplace,
electric discharges in gases,
ozone, corona discharge, Trichel pulses,
particle-in-cell method, linear and nonlinear stability,
Rayleigh-Benard convection, Poiseuille plane flow, Taylor-Couette flow,
dielectric liquid, injection of charge, residual conduction, dissociation,
ionic pairs, ohmic conduction, saturation of current, current limited by
spatial charge, Onsager effect,
colloidal systems in non-aqueous media,
electrokinetics, microfluidics,
bioparticles in electric fields,
forces between particles, fluidized bed, avalanches, powder characterization,
powder flowability, cohesion, force of van der Waals, compressibility, plastic
flow,
fluidization, cohesive granular media, fine powder,
yield stress,
aggregation, jamming transition,
attractive force between particles,
pseudoturbulence,
rotating drum, self-organized criticality,
settling, Richardson-Zaki law,
diffusive dynamics,
yield strength,
parallel computing, fine particles, adhesion, contact mechanics,
plasticity, packing, atomic force microscope
Directions of research in a few words:
Main scientific results:
-
Equation of the temperature and entropy in electrohydrodynamics
- Mathematical analysis of the competition between diffusion and coulombian
repulision and their influence on the charge distribution in
electroconvection, produced by unipolar injection
- Demonstration of the stabilizing effect of longitudinal electric fields in
dielectric liquid bridges, including the case of
gravity
- Stabilization of liquid bridges in magnetohydrodynamics by means of
alternating magnetic fields
-
Deduction, justification and investigation of applicability of 1D models
for liquid bridges and jets
- Theoretical demonstration of the existence of solitons in ohmic
liquids
- Analysis of the instabilities induced by stationary and transient electric field
in different interfaces
with/without injection
-
Development of computational algorithms (particle method, FCT, FEM)
to study electroconvection in insulating liquids
- Autosimilar solution for electrohydrodynamic
bidimensional and axisymmetric plumes
- Study of the dynamics of a conducting ball
immersed in weakly conducting liquid
- Demonstration that the composition of electrodes is a crucial factor
in the generation of ozone by means of corona discharge
-
Powerful numerical method, suitable for the simulation of electrical gas
discharges
-
Analytical, numerical, and experimental analysis of AC electroosmosis and electrothermal flows
- Electroviscous effect in moderately concentrated colloidal suspensions
-
Automated apparatus to measure the properties of the fine cohesive powders (Sevilla Powder Tester)
-
Apparatus to measure the properties of the cohesive granular media with particle
size of the order of 100 microns or bigger (Triana Powder Tester)
-
Demonstration of absence of the inertial (collisional) regime with negligible
interstitial gas interaction in granular cohesive fine media
- Demonstration of the existence of two homogeneous fluidization regimes
in fine powders: a) solid-like (with permanent contacts
between particles) and b) fluid-like (non-permanent contacts) and their
dependence on particle size
- Determination of the size and structure of the aggregates of the
fine cohesive granular medium in the liquid-like state and its
transition by sedimentation to the solid-like state
- Theoretical and computational model
of the elastoplastic adhesive contact
of two micrometric particles
SISIUS homepage of the group EHD*MGC (in Spanish)
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Last update: November 24, 2004