DEM simulation of particle comminution in jet milling

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Abstract

A combined discrete element method (DEM) and CFD numerical model was developed to stimulate particle comminution in a jet mill. The DEM was used to stimulate the motion of the particles in the gas flow. For this, the compressible Reynolds Averaged Navier-Stokes (RANS) equations were used to describe the gas flow field inside a given size's jet mill. Ghadiri's models for breakage and chipping were implemented in the simulation to define the reduction of the particle's size during jet milling. The size distributions of the particles after grinding were obtained numerically. The prediction of the numerical simulation for the median particle size d50 after grinding was qualitative compared with experimental results for the different operating conditions (i,e., feed rate, angle of grinding nozzles, vohlmetric rate of grinding air, etc.). The comparison shows good agreement with the experimental/observation. The results shows that the feed rate, angle of feeding nozzle, and feeding air's flow rate have more influence on the breakage and chipping of particles in jet milling. In addition, a parametric study was performed to obtain the desired operation conditions.

Original languageEnglish
Pages (from-to)325-340
Number of pages16
JournalParticulate Science and Technology
Volume20
Issue number4
DOIs
StatePublished - 1 Oct 2002

Keywords

  • DEM simulation
  • Jet milling
  • Particle comminution

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