Effect of Discharge Parameters on Electrohydrodynamic Flow with Asymmetric Discharge Electrodes

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  • Takeuchi Nozomi
    Department of Electrical and Electronic Engineering, Tokyo Institute of Technology
  • Yasuoka Koichi
    Department of Electrical and Electronic Engineering, Tokyo Institute of Technology
  • Ishii Shozo
    Department of Electrical and Electronic Engineering, Tokyo Institute of Technology

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The characteristics of electrohydrodynamic (EHD) flow induced by an asymmetric surface barrier discharge were investigated by changing the discharge parameters, such as transferred charge, sustaining voltage, and driving frequency, and so on. The discharge induced the EHD flow close to the dielectric surface, and the flow velocity was up to several m/sec. There was a strong polarity effect on the peak value of the discharge current. Intense microdischarges were generated when the relative potential of the buried electrode was negative to the exposed electrode, whereas only weak microdischarges were measured when the buried electrode was positive. The mean flow velocity was found to be proportional to the discharge power that was nearly a quadratic function of the sustaining voltage and a linear function of the driving frequency. The increasing rate of the flow velocity for the discharge power was high in higher power operations, where the sustaining voltage was increased by higher voltage application between the electrodes. The flow velocity was proportional to the total amount of electric charges, but it was largely affected by the increase of the sustaining voltage.

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