Optimization of the Classifying Efficiency of Spiral Jet Mills by Investigating the Flow Conditions and the Grinding Performance

Abstract

The achievable grinding fineness of spiral jet mills does not only depend on the comminution efficiency in the region of the nozzle jets but is also significantly affected by the separation efficiency in the region of the product outlet. Therefore, the aim of this study is to investigate the influences of the product outlet diameter and different particle trap rings on the flow conditions and the grinding performance, optimizing the classifying efficiency of spiral jet mills. The velocity fields analyzed by particle image velocimetry and the experimental grinding results show that the classification process can be optimized by both reducing the product outlet diameter and installing a particle trap ring.

Investigation of the Mixing Time Distribution and Connected Flow Fields in Two-Stage Stirred Vessels

“…Experiments were conducted in the same laser-optical testing facility that was used to investigate flow patterns in stirred tanks [21][22][23] as well as other processes [24] during previous studies from this workgroup.…”