抄録
The fundamental performance characteristics of an electro-hydrodynamical (EHD) pump composed of a ring electrode and a cylindrical electrode have been discussed. The ring electrode and the cylindrical electrode, namely, the EHD pump is arranged inside an acrylic U type pipe that is filled with working fluid such as transformer oil. In this paper, we mention measurement of liquid displacement, relations between electric pressure and applied voltage, and polarity effect of applied voltage of the EHD pump that vertically transports dielectric liquid such as transformer oil. Liquid displacement caused by the non-uniform electric field is defined as its difference from the steady state liquid level. Test results indicate that liquid displacement is significantly dependent on applied voltage. The electric pressure reached 810(Pa) at applied voltage of 30(kV). When applied voltage exceeded a threshold value, the electric pressure was produced. The transformer oil always moved from the cylindrical electrode toward the ring electrode. Namely, polarity effect of applied voltage on direction of liquid displacement was not observed.
