The idea of using square cyclones was first introduced in early 1990s because of some
problems of big conventional (round) cyclones in Circulating Fluidized Bed (CFB) industries,
such as huge volume and long start-stop time of cyclones. Now there is this question, in
spite of the main reason for making square cyclones, how square cyclones behave in small
sizes. In this paper, two small cyclones with the same hydraulic diameter, which one is
square and the other one is round, are numerically compared. The Reynolds averaged …