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So far, electrohydrodynamic (EHD) pumps based on the injection or the field-enhanced dissociation (the Wien effect) at the surface of metal electrodes have been studied. This paper proposes and studies both numerically and experimentally a fundamentally new pump scheme, namely, the EHD pump operating due to the Wien effect in a conical hole located in the solid insulation barrier. An experimental setup of the pump has been created, and performance (pressure vs flow rate) characteristics have been measured that satisfactorily agree with the results of computer simulation. With the size of the hole being a fraction of a millimeter, the proposed system performance is comparable to that of the previously studied EHD pumps. [ABSTRACT FROM AUTHOR]

A sphere–plane electrode system in the air with one or two dielectric sheet barriers arranged perpendicularly to a grounded plane is considered. Hence, the barriers do not obstruct the shortest path between the electrodes. The effect of the barriers on streamer processes and breakdown is studied. It has been revealed that the breakdown voltage generally decreases, when the barrier–electrode distance is reduced. [ABSTRACT FROM AUTHOR]