Non-equilibrium phenomena in spherical aerosol bipolar charging

J.L. de La Verpilliere, J.J. Swanson and A.M. Boies

Experimental evidence is given that the n.t product rule for prediction of aerosol charge distribution equilibrium behaviour in a neutraliser fails at high particle concentration or low particle size. Charging equations are solved numerically to map equilibrium behaviour as a function of two non-dimensional groups, the non-dimensional ion concentration, and the non-dimensional neutraliser residence time. A 3D model then captures the physics of unsteady particle charging inside a neutraliser, and experimental results match predictions from the non-dimensional model. Finally, a new tool supplementing the n.t product rule is proposed for practical use.

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