“…The cyclone collection efficiency (D p50% ) can be dened by the Lapple model shown in eqn (2), where m, b, N e , V i , and r p are the air viscosity, inlet width, number of effective turns, inlet velocity, and particle density, respectively, which is one of the theoretical formulae for cyclones. 17 Slower ow rates during classication yielded a larger arithmetic mean particle size, in accordance with eqn (2). Consequently, three different particle sizes were successfully obtained using the cyclone system.…”