P. Atten et L. Elouadie, EHD CONVECTION IN A DIELECTRIC LIQUID SUBJECTED TO UNIPOLAR INJECTION- COAXIAL WIRE CYLINDER GEOMETRY, Journal of electrostatics, 34(2-3), 1995, pp. 279-297
The injection of charge carriers into a dielectric liquid lying betwee
n a wire and a coaxial cylinder generally induces a motion of the liqu
id. The characteristics of the convection and its effect on the passag
e of electrical current are examined with reference to the similar ele
ctroconvection which exists in a planar layer of liquid. After recalli
ng the main results obtained in the latter geometry for both weak and
space charge limited injections, a rough analysis is developed in the
case of strong injection in an annulus. It gives some expressions for
the typical convective velocities. The experimental determination of t
he variation laws of the current and of the typical velocity apparentl
y reveals the occurrence of two conduction regimes. The analogies and
differences with the characteristics of the regimes of convection in a
planar layer are indicated and discussed.