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A sliding discharge-type electrohydrodynamic (EHD) gas pump, utilizing a discrete saw-toothed-plate electrode as a discharge electrode instead of a smooth conventionalplate electrode, has been developed. The effect of the saw-toothed-plate electrode on the gas flow velocity and yield of flow generation of the EHD gas pump were investigated. It was observed that the EHD gas pump can generate a higher gas flow velocity and yield of flow generation than the same design EHD gas pump with the conventionalplate electrode. As a result, a peak gas flow velocity of V G =1.65 m/s from the EHD gas pump with the saw-toothed-plate electrode can be obtained for V P =12.0 kV, which is 2.39 times higher than that of V G =0.69 m/s of the same design EHD gas pump with the conventional-plate electrode. With the saw-toothed-plate electrode, the yield of flow generation of Y G =0.435 m/Ws can be obtained for V=8.0 kV, which is 4.53 times higher than that of the same design EHD gas pump with the conventional-plate electrode of Y G =0.096 m/Ws. These enhancements are due to the effect of the saw-toothed-plate electrode being utilized instead of the conventional-plate electrode.Index Terms -EHD gas pump, sliding discharge, saw-toothed-plate discharge electrode, conventional-plate discharge electrode, gas flow velocity.

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An electrohydrodynamic (EHD) gas pump, utilizing a ring/needle electrode, has been proposed and the effect of the ring electrode to the flow velocity and yield of flow generation of the EHD gas pump was investigated. The needle/ring is used as a corona discharge electrode and the mesh is used as the ion collecting electrode. It was observed that the proposed type of EHD gas pump can generate a higher flow velocity and yield of flow generation as compared with that from the same EHD gas pump without the ring electrode. As a result, a maximum flow velocity of V W =4.54 m/s from the proposed EHD gas pump can be obtained at V=15.0 kV, which is 1.2 times higher than that of V W =3.82 m/s of the same needle-to-mesh type EHD gas pump without the ring electrode. With the ring electrode, the yield of flow generation of Y W =46.15 m/Ws can be obtained at V=11kV, which is 2.5 times higher than that of the design without the ring electrode of Y W =18.41 m/Ws. These enhancements, however, may be due to the effect of the ring electrode installed near the needle electrode.Index Terms -EHD gas pump, ring/needle electrode, corona discharge, ionic wind, gas flow velocity. Jae-Duk Moon (M'