“…The cone discharge, which can be incendiary to a flammable dust cloud, has been extensively studied experimentally and theoretically (Glor, Lüttgens, Maurer, & Post, 1989;Glor & Schwenzfeuer, 1997;Ohsawa, 1999). Preventive methods for a cone discharge, however, are still being developed, although some static chargeneutralizing devices have been introduced (Kodama, Suzuki, Nishimura, Yagi, & Watano, 2002;Kodama, Yamaguma, Suzuki, Mogami, & Watano, 2005;Mogami, Suzuki, Choi, & Yamaguma, 2008;Taillet, 1993). Other conventional methods include suspending a passive discharge wire in a silo (Jones & King, 1991) and fixing a pointed metal rod at the inlet pipe to enhance the corona discharge (van de Weerd, 1974).…”