Dynamics of a water/air interface on insulating solid surface submitted to DC high voltage

Abstract : The interaction of electrical fields and liquids can lead to complex phenomenon such as spraying jets, Taylor cone and sideways wobbling. The focus of this paper is to investigate the dynamics of a water/air interface when water droplet or water puddle sitting on an insulating surface is submitted to DC voltage. Hence, under a uniform field loss of stability occurs through a subdivision of the water film on many small water puddles. However, under a non-uniform electric field destabilization may occur at a point at which the film profile already exhibits a finite-amplitude deformation. An experimental study of the deformation of a water droplet and water puddle on composite insulating surface in rod to plane electrodes configuration is undertaken. The critical electric field strength at which a water/air interface becomes unstable is determined. Variation of the free surface deformations relative to the applied voltage and typical current discharges characteristic from water/air interface are presented. The behaviour of the inception field strength of partial discharges between water/air interface and rod electrode also is shown. The results show that the electric field applied to the water/air interface is determined by the electrode geometry and the spacing between water surface and the electrode.
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Jean Ndoumbe, Adolphe Imano, Abderrahmane Beroual. Dynamics of a water/air interface on insulating solid surface submitted to DC high voltage. ISH, Aug 2013, Séoul, South Korea. pp.PE-15. ⟨hal-00921841⟩

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