An EHD gas pump utilizing a ring/needle electrode

Abstract

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'

Electric Field-Driven Liquid Metal Droplet Generation and Direction Manipulation

“…An electro-hydrodynamic method for controlling the behavior of the liquid has been widely investigated [1,2]. Since this method can generate micro-and nano-sized droplets ondemand, it can be applied to various applications such as micro-scale structures [3][4][5][6], spray coating [7][8][9][10][11], heat transfer enhancement [12][13][14], fluid pumping [15][16][17][18], drying [19][20][21][22], and thrust [23][24][25]. Most of the electro-hydrodynamic methods were applied to printing applications [26][27][28][29][30].…”