An experimental study of the optical characterization of AC electrohydrodynamic fields by particle image velocimetry

Abstract

This paper describes the optical characterization of electrohydrodynamic @HD) fields in the liquid dielectrics subjected AC high voltage. The velocity fields are obtained by a particle image velocimetry ( I " . The EHD fields are formed in lOcSt silicon oil and ethanol with different dielectric constant. The PIV requires illuminated tracer particles for the fluid flow visualization. For the requirement, the particles of aluminum powder with good condudivity and polyethylene pow& with high resistivity are suspended into the liquids and are not related eleclrification because of the AC electric fields. From a viewpoint of EHD flow visualization, the main purpose of this study is velocity measurements of the tracer particles moved by electrostriction in the fields. The PIV applied to the measurements gives us an interesting experimental result of velocity fields for the EHD phenomena.

Visualization of EHD Fluid Motion Induced by Surface Corona Discharge

“…A vortex is created into the dielectric liquids by EHD fluid motion under AC electric fields (2). It also takes interests in that the EHD fluid motion couples to corona discharge at the , dielectric liquid surface.…”