TY - JOUR
T1 - CFD Modelling of Spiral Concentrator- Prediction of Comprehensive Fluid Flow Field and Particle Segregation
AU - Sudikondala, Purushotham
AU - Mangadoddy, Narasimha
AU - Kumar, Mayank
AU - Kumar Tripathy, Sunil
AU - Yanamandra, Rama Murthy
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/6/15
Y1 - 2022/6/15
N2 - A comprehensive numerical analysis of the fluid flow and dilute particulate flow in the LD9 spiral separator is presented in this work. The air–water flow field on a coal spiral is simulated using the volume of fluid (VOF) coupled with RANS turbulence models. Water depth and flow field predictions by RSM show close agreement with experiments. Stability depth, turbulence intensity was analyzed for entire liquid depths. The discrete phase model is used to model the dilute particulates at different flow rates. Turbulent dispersion of particles using dispersion index and Bagnold force analysis indicate that centrifugal force dominates the separation at increased particle size and water depth level, whereas the fines are significantly affected by turbulence dispersion at the outer trough region. The magnitude of the Bagnold to gravitational force increases from the inner to outer trough region and a dip at the outer edge region due to inherent change of shear rate. Coarse particles experience higher lift than the fines and migrate to the top flowing layers.
AB - A comprehensive numerical analysis of the fluid flow and dilute particulate flow in the LD9 spiral separator is presented in this work. The air–water flow field on a coal spiral is simulated using the volume of fluid (VOF) coupled with RANS turbulence models. Water depth and flow field predictions by RSM show close agreement with experiments. Stability depth, turbulence intensity was analyzed for entire liquid depths. The discrete phase model is used to model the dilute particulates at different flow rates. Turbulent dispersion of particles using dispersion index and Bagnold force analysis indicate that centrifugal force dominates the separation at increased particle size and water depth level, whereas the fines are significantly affected by turbulence dispersion at the outer trough region. The magnitude of the Bagnold to gravitational force increases from the inner to outer trough region and a dip at the outer edge region due to inherent change of shear rate. Coarse particles experience higher lift than the fines and migrate to the top flowing layers.
KW - Bagnold Forces
KW - DPM model
KW - Residence time distribution
KW - Segregation
KW - Spiral concentrator
KW - Turbulence
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U2 - 10.1016/j.mineng.2022.107570
DO - 10.1016/j.mineng.2022.107570
M3 - Article
AN - SCOPUS:85129819640
SN - 0892-6875
VL - 183
JO - Minerals Engineering
JF - Minerals Engineering
M1 - 107570
ER -