High stress aggregation and transport of electrons in dielectric oil

Abstract

High-voltage charge transport in dielectric oil under slowly time-varying voltage conditions is considered. Theoretically the transport is seen to result from the formation and movement of aggregates of trapped charges bounded in tiny cells enclosing Beltram flow fields. Such entities do not interact with the fluid and can therefore accelerate as free particles for finite time intervals. They can react both with the electrostatic field and with an electrodynamic component introduced by detrapping of electrons and subsequent diffusion and retrapping on adjacent field lines, causing rotation of the fluid and mechanical acceleration, /spl omega/ /spl times/ u. This introduces a fluid dynamic analogue of the usual electrodynamic body force, J /spl times/ B. Since vorticity is thus generated, it is manifested as an effective reduction of the fluid viscosity with the superimposed effect of eddies.<>