Swirling stability of fluid flow in cyclone at supersonic velocity: article

Cyclone is device that use the angular momentum principle to separate the solid particle in the gas. There are many mechanism of working principle of cyclone in the industry. But not all of that mechanism is suitable for at that what we want. In this study, we are ready specific to focus on how the effect on the swirl stability when it flow at supersonic speed and also to study their flow behavior in the cyclone. By using mathematical modeling of k-epsilon RNG. In the standard k-epsilon model the eddy viscosity is determined from a single turbulence length scale, so the calculated turbulent diffusion is that which occurs only at the specified scale, whereas in reality all scales of motion will contribute to the turbulent diffusion. In this section, we used the numerical method k-epsilon RNG because it is more accurate to handle the high swirl flow. RNG is model to use for suitable condition with cyclone vortex. In this case of determine the stability of swirl then the use of RNG model is very better than Realizable. RNG k-ɛ model is design to handle the swirl flow compare to the Realizable k-ɛ model (Hreiz, 2011). The swirl number will shows the stability of swirling flow at velocity Mach 1 and velocity Mach 4. The vortex core region at velocity Mach 1 is very smooth when we compare to the velocity at Mach 4. In this study, we can summarized that the stability of swirling flow is can come in various form and at the same time when it is bounded with vortex. Streaky speaking, the stability of swirl in cyclone at supersonic speed is not stable. But in this experiment the slowed the velocity the stable it is. At the same time, the study of behavioral of supersonic flow in cyclone is a something news because of the vortex breakdown was found. Not much literature today was study about the supersonic flow in cyclone.