Corona based air-flow using parallel discharge electrodes

Abstract

A novel air-flow generator based on the effect of ion wind has been developed by the simultaneous generation of both positive and negative ions using two electrodes of opposite polarity placed in parallel. Unlike the conventional unipolar-generators, this bipolar configuration creates an ion wind, which moves away from both electrodes and yields a very low net charge on the device. The electro-hydrodynamic behaviour of air-flow has been experimentally and numerically studied. The velocity of ion wind reaches values up to 1.25 m/s using low discharge current 5 μA with the kinetic conversion efficiency of 0.65% and the released net charge of -30 fA, 8 orders of magnitude smaller compared with the discharge current. Due to easy scalability and low net charge, the present configuration is beneficial to applications with space constraints and/or where neutralized discharge process is required, such as inertial fluidic units, circulatory flow heat transfer, electrospun polymer nanofiber to overcome the intrinsically instability of the process, or the formation of low charged aerosol.

A study of angular rate sensing by corona discharge ion wind

“…The resistance variations of the hotwires is then converted to the ion wind velocity by comparing the heat transfer coefficient of forced convection, from the generated ion winds with that of natural 0.24 + 0.56 0.45 , convection from a still air [26], where is the thermal conductivity, Ra the Rayleigh number, d the 1.02 0.1 effective diameter of the hotwire and the Reynolds number. The process is carried out using an = / subroutine C-code which was detailed in our recent publications [27]- [29].…”

Computational and experimental study on ion wind scheme based aerosol sampling for biomedical applications

“…An electric field caused by a high voltage isolated from the sampling collector is applied between two discharge electrodes to generate ionized wind. By the effect of the electric field and bipolar ionized wind, particles are neutralized and gently shifted toward the collection cavity of the channel [8]- [10]. Since neither electrode nor sampling chip is installed inside the channel, there is not any obstacle through the channel.…”

Study on Point-to-Ring Corona Based Gyroscope

“…Hence, EHD is a potential method supported by technological advances in microfabrication [1] [2]. The jet flow based on this approach was recently applied in airflow control [3] [4]; propulsion technology [5]- [7] [8] and bio-electronic device [9]. In this paper, ionic corona is used to develop angular rate sensors in 3D space where a flow vibrates by an inertial force.…”