Particle precipitation by bipolar corona discharge ion winds

Abstract

The paper reports the development of a particle precipitation based aerosol sampler using bipolar corona discharge ion winds with collected particles of minimized net charge. For the new approach, neutralized particles move towards a sampler under the effect of electric field and dual ion winds. Since there is no electrode or sampling chip installed inside the air-flow channel, impediments to airborne particle flow or ion winds are removed along the flow direction. In addition, the isolation of ion winds, which generate circuit, allows using various materials for the sampling chip including non-conductors and also protecting collected particles from any discharge ignition on the chip. The device mechanism is numerically simulated in OpenFOAM to study the electrofluidodynamic interaction of charged particles and bipolar ion winds. The efficiency of the new approach has been investigated by experiment with a maximum efficiency of 94%. The effects of flow rate, discharge voltage and electrode distances on the method are also evaluated.

Behavior of ultrafine particles in electro-hydrodynamic flow induced by corona discharge

“…Experimental and numerical studies have demonstrated a good agreement in the size range of 0.3 μm -10 μm (Goo and Lee 1997, Park and Kim 2000, Dau, Dinh et al 2018. Multiple experimental studies for the PM in size range of 30 nm -400 nm (Yoo, Lee et al 1997, Miller, Frey et al 2010, Dey and Venkataraman 2012, Roux, Sarda-Estève et al 2016) agree with the theoretical models.…”

In-air particle generation by on-chip electrohydrodynamics

“…a two orders of magnitude smaller than a typical corona discharge, to minimize the unexpected effect such as streamer discharge. In our previous work, we proved that a current of ~2 µA is sufficient to generate strong ionic wind that can manipulate the movement of micro-/nano-particles [53,54].…”

Simultaneous Generation and Delivery of Neutral Polymeric Aerosol by Electro-Hydrodynamic Nebulizer

“…Thus, different approach to fabricate micro/nano particles has been studied intensively to suit biomedical applications. Electrohydrodynamic techniques such as electrospraying, and electrospinning are a potential scheme in generating or collecting nanostructured materials [4] [5]. However, due to being highly charged, particles fabricated by those techniques require a grounded electrodes as collector (Fig.…”