Title :
The interpretation of electrohydrodynamic mobility under unipolar injection in dielectric liquids
Author :
Wang, H.T. ; Cross, J.D.
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada
Abstract :
The EHD (Electrohydrodynamic) mobility with unipolar injection in the transient regime has been investigated theoretically in terms of the EHD interfacial instability. A new expression of the transient EHD mobility is given by considering the dynamics of the interface between the space charge layer in front of the injecting electrode and the bulk of the dielectric liquid. It is shown that the EHD mobility depends on not only the (∈/ρ)1/2, but also on the characteristics of the interface and electrode separation. The dynamics of the space charge/liquid interface plays a very important role in the conduction process, especially in the dielectric liquids in which the ion `injection´ is the predominant mechanism of providing charge carriers. The type of instability proposed leads directly to the observed EHD delay time, mobility, and fine filamentary structure of the transient electroconvection which has been observed experimentally
Keywords :
dielectric properties of liquids and solutions; electric breakdown of liquids; electrohydrodynamics; space charge; EHD delay time; dielectric liquids; electric breakdown; electrode separation; electrohydrodynamic mobility; fine filamentary structure; interfacial instability; ion injection; space charge layer; transient electroconvection; transient regime; unipolar injection; Charge carriers; Dielectric liquids; Electrodes; Electrohydrodynamics; Electrostatics; Kinetic energy; Permittivity; Space charge; Viscosity; Voltage;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172050