Based on Fluent 6.3.26

the gas-solids two-phase flow behavior and details of multi-jet cyclone with swirling based on nozzles

was simulated and analyzed with the Reynolds stress model (RSM) and discrete particle model (DPM). Compared with conventional cyclones

peak value of tangential velocity and average value of free-vortex reached 160 m·s-1 and 130 m·s-1 respectively

generating higher flow rotation intensity. Volume rates of downward flow kept declining along the central line

particularly in the stabilization region

inducing more chances for particles being entrained by inner upward flow with lower collection efficiency. Local roof wall-jet and circulating flow nearby the inlet of the hopper were typical secondary flows of multi-jet cyclone. Gross pressure loss of the separator was 27.43 kPa

consisting of outer swirl flow 4.57 kPa (21.8%)

inner swirl flow 5.76 kPa (27.6%) in the nozzles region

and outer swirl flow 5.85 kPa (27.6%)

inner swirl flow 4.01 kPa (18.9%) in the stabilization region. Particles with diameters larger than 10 μm could be collected completely with cut-diameter 1.6 μm

making it suitable for industrial application. Analyzing with the particle mechanical model in this paper

the critical diameter of particle that can be separated was 1—2 μm and particle concentration for particles large than 3 μm in the vortex finder was less than 0.15 g·m-3.