Modelling of the Cavity Transfer Mixer

The blending of different materials is an important process in polymer industry, where a good mixing is essential to guarantee adequate performances of the finished product. In the 80s a new device called the Cavity Transfer Mixer (CTM) was invented and patented by Gale at Rapra Technology Limited, as an add-on to be mounted downstream of existing extruders, in order to improve distributive mixing. The CTM consists of two concentric cylinders, the rotor and the stator, both provided with staggered rows of hemispherical cavities.

The result of the interaction between the moving geometry, the imposed pressure load and the rheology of the fluid is the complex flow field driving the mixing mechanisms inside the device. The goal of the project is to support the system optimization by developing a mathematical model of the CTM able to assess the impact of geometrical and functioning variables on mixing.

This work is funded by ColorMatrix PolyOne.

Type of research: numerical