Abstract
The influence of aerosol concentration on the charge per particle is investigated in post-DC corona diffusion chargers for particle diameter between 10 nm and 1 µm. Particles are charged as they pa...
Highlights
Due to the low cost, simplicity and reliability, electrical discharges at atmospheric pressure are commonly used to produce high densities of unipolar ions for aerosol charging (Borra 2006; Intra and Tippayawong 2011; Whitby 1961; Zheng et al 2016)
This paper addresses the influence of aerosol concentration on the mean charge per particle measured downstream in post-corona chargers with a single ion injection and the three effects described above
3.1 Influence of aerosol concentration on the mean charge per particle The reduction of the mean charge per particle with aerosol concentration is first reported in the charger with perpendicular crossflow mixing of ions and aerosols and compared to the case of different ion-aerosol mixing conditions in order to highlight the effect of aerosol space charge
Summary
Due to the low cost, simplicity and reliability, electrical discharges at atmospheric pressure are commonly used to produce high densities of unipolar ions for aerosol charging (Borra 2006; Intra and Tippayawong 2011; Whitby 1961; Zheng et al 2016). Most aerosol chargers operate in post-discharge, meaning that two separate gas flows, one containing aerosol and the other containing ions, are mixed downstream of the ion source, which is typically an electric discharge. This is done to limit aerosol losses in the discharge gap and the subsequent discharge destabilization, as well as the ions mobility dependence on gas composition of the sampled aerosol. In this operating mode, without Laplace electric field (due to polarized electrodes), particles are charged only by ion diffusion
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