Abstract

The chaotic mixing process in a continuous mixer plays an important role and has an essential influence on the performance of prepared materials. To reveal how a polymeric drop experienced the chaotic mixing and give more specific analysis about the chaotic mixing, the morphology development of a single drop was traced and recorded with an on-line visualization system. The drop would undergo elongation deformation, reorientation, and folding process, which were the typical signs of chaotic mixing. The elongation deformation was an important precondition for drop experiencing the reorientation and folding process and mainly existed in the region near the barrier, rotor tip clearance, and wedgelike region. The reorientation and folding process mostly appeared in the region near the rotor flat and interaction window. Besides, the erosion process of the drop was observed at the initial stage under lower rotor rotation speed. The chaotic mixing always held the dominant place in continuous mixer although the rotor rotation speed and drop viscoelasticity were adjusted. In this work, the chaotic mixing in a continuous mixer was dynamically presented. The dynamical results would give a more real and visual understanding of the chaotic mixing.

Highlights

  • In the polymer processing industry, the mixing process in mixer or extruder was a key factor determining the performance of the prepared material [1]

  • At t = 11.58 s in Figure 3b, the ABS drop was transferred to the interaction without any elongation deformation, but the ribbon connecting to the drop as a tail was formed at the window without any elongation deformation, but the ribbon connecting to the drop as a tail was drop surface

  • The chaotic mixing in circumferential flow for a continuous mixer was presented with tracing the morphology development of polymeric drops

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Summary

Introduction

In the polymer processing industry, the mixing process in mixer or extruder was a key factor determining the performance of the prepared material [1]. The mixing process showed many interesting behaviors related to the morphology development of the disperse phase, which resulted from the flow field in the mixer or extruder [2,3]. The morphology development would give some indication about the flow characters in the mixing process. The experiment basing on the visualization technology was an effective method for observing the morphology development and understanding the mixing process [4]. The mixing process in mixer or extruder was relatively complicated, which was originated from the complex configuration of the mixing chamber and mixing element. It is difficult to realize the on-line observing the morphology development of the disperse phase in mixer or extruder [5]

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