Effects of Using Ribs on Flow Pattern and Performance of Cyclone Separators

Abstract

ABSTRACT:In this paper, the effects of using ribs on the flow pattern and performance of cyclone separators are investigated using CFD techniques. The Reynolds averaged Navier-Stokes equations with Reynolds Stress Turbulence Model (RSTM) are solved by use of the finite volume method based on the SIMPLE pressure correction algorithm in the computational domain. The Eulerian-Lagrangian computational procedure is used to predict particles tracks in cyclones with different rib pitch to cyclone diameter (P/D) ratios. The velocity fluctuations are simulated using Discrete Random Walk (DRW). The results show that using ribs in cyclones leads to higher collection efficiency but higher pressure drop and the cyclone with P/D equal to 1 has the maximum collection efficiency among the ribbed cyclones and the cyclone without ribs has the least pressure drop.

A Comprehensive CFD Assessment of Wheat Flow in Wheat Conveying Cyclone Validation and Performance Analysis by Experimental Data

“…Increasing the turbulent intensity in the vortex finder was an important factor in decreasing the separation efficiency at high inlet velocities (18 and 20 m s −1 ) (Figure 12). A comparison trend of variations of maximum tangential velocity, axial velocity, and turbulent intensity of mentioned parameters in various inlet velocities is presented in Figure 13. The increase of tangential velocity is sharper with inlet velocity increase, while both axial velocity and turbulent intensity increased moderately with increasing inlet velocity.…”

“…A comparison trend of variations of maximum tangential velocity, axial velocity, and turbulent intensity of mentioned parameters in various inlet velocities is presented in Figure 13. The increase of tangential velocity is sharper with inlet velocity increase, while both axial velocity and turbulent intensity increased moderately with increasing inlet velocity.…”

“…The authors applied RSM based on the SIMPLE scheme to model the turbulence in the flow. The results indicated that utilizing ribs leads to a higher pressure drop and higher collection efficiency [13]. In another study, various discretization schemes were performed in the simulation of the dispersed phase of the cyclone separator.…”

Numerical Study of Flow Field in New Design Dynamic Cyclone Separators

“…Hoffman et al [22] and Safikhani et al [23] concentrated on study of the height of the cyclones. Furthermore, the effect of holes in the cyclone and hem of the internal walls of the cyclone was studied by Wang et al [24] and Farahani et al [25] respectively. Su and Mao [26], Safikhani et al [27] and Su et al [28] investigated the performance of the rectangular cyclone.…”

Comparison of the Performance of MR-deDuster with Other Conventional Cyclones

“…The collection efficiency and pressure drop resulting from this model were compared with the cyclone/multi-cyclone of different models, for example, Leith and Licth model (Coker 1993;Leith & Licht 1996;Licht & Koch 1977), Barth model (Bohnet et al 1997), Mothes model (Mothes & Löffler 1988), Lorenz model (Lorenz 1994, CFC (Wanga et al 2010), DIII model (Wang et al 1990), Ideal-laminar cyclonic flow model (Benitez 1992), turbulent cyclonic flow model (Benitez 1992), not ribbed-CFD, rib pitch to cyclone diameter ratio (P/D)=1.5-CFD, P/D=1-CFD Ideal (Farahani et al 2011) and Karagoz model (Avci & Karagoz 2003). The data of collection efficiency and pressure drop were taken from the descriptions of the individual model found in literatures.…”