Unipolar Injection Induced Electroconvection

  • Antonio Castellanos
Conference paper
Part of the International Centre for Mechanical Sciences book series (CISM, volume 380)


Up to now we considered the convection of rather limited amplitude and we implicitly assumed that the convective pattern is well defined so that we deal with nearly identical convective cells of long life time compared with the mean rotation time in a cell. The studies recalled in chapter 2 focused on the time dependent character of injection induced convection and the transition to chaotic behaviour for convection in one convective cell only. This picture no longer applies when the applied voltage is high enough: the pattern destabilises (“phase turbulence” [1,21) and the life time of convective cells becomes so short that they can no longer be considered as individual and well defined cells (see for instance the pattern in [3]). The time behaviour of the measured current then reflects the complex evolution of the spatial distribution of the velocity field as well as the vacillation of velocity amplitude in individual convective cells (the “phase turbulence” results in low and very low frequency noise in the power spectra as it appears in Fig. 16-4).


Nusselt Number Coulomb Force Forced Flow Typical Velocity Applied Voltage Versus 
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Copyright information

© Springer-Verlag Wien 1998

Authors and Affiliations

  • Antonio Castellanos
    • 1
  1. 1.University of SevillaSpain

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