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2 results

  • Numerical modelling of Coulomb-driven convection in insulating liquids

  • R. CHICÓN, A. CASTELLANOS, E. MARTIN
  • Journal:
    Journal of Fluid Mechanics / Volume 344 / 10 August 1997
    Published online by Cambridge University Press:
    10 August 1997, pp. 43-66

  • Electroconvection in a layer of liquid subjected to unipolar injection is characterized by two stability criteria, a linear and a nonlinear one, with an associated hysteresis loop. Experimentally it is found that the velocity field fluctuates around its mean value. A temporal analysis of the measured current, which is directly related to the velocity, revealed the existence of a well-defined frequency correlated to the mean rotation time of a fluid particle in the convective cell, thus indicating that these fluctuations are not stochastic but related to the intrinsic dynamics of the system. Here a method of superparticles is used to solve the problem of the non-stationary electroconvection of the liquid. A good agreement between theoretical and experimental results is obtained.