Experimental and numerical investigations of the corona characteristics of a new Tri-electrode system for electrostatic separation processesMohamed M. Abouelsaad, Mohamed A. Abouelatta and Abdelhadi R. SalamaEur. Phys. J. Appl. Phys., 67 3 (2014) 30801DOI: https://doi.org/10.1051/epjap/2014140137