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Simulation of Multi‐Stage Particle Classification in a Zigzag Apparatus
Author(s) -
Hagemeier Thomas,
Glöckner Hannes,
Roloff Christoph,
Thévenin Dominique,
Tomas Jürgen
Publication year - 2014
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300670
Subject(s) - zigzag , mechanics , turbulence , residence time (fluid dynamics) , vortex , particle (ecology) , flow (mathematics) , particle size , computational fluid dynamics , residence time distribution , stage (stratigraphy) , statistical physics , materials science , mathematics , physics , engineering , geometry , geology , geotechnical engineering , oceanography , chemical engineering , paleontology
The separation efficiency of a pilot‐scale zigzag apparatus is investigated numerically using computational fluid dynamics simulations and discrete particle modeling in a coupled manner. The effects of various process variables, like particle size and air flow velocity, and of turbulence models were analyzed. The resulting changes concerning the process performance expressed by separation function and sharpness are discussed. Moreover, the residence time distribution was found to differ for fine and coarse particle discharges. Small particles are easily carried away by the fluid and respond immediately to almost every change in flow velocity. Therefore, they are affected by vortices, which increase their residence times compared to bigger particles.