High distributive mixing rotor

High Distributive Mixing rotor Courtesy ofTechint Pomini)... 

FIGURE 35.19 High distributive mixing (HDM) rotor design (tangential) of Pomini SpA. 

Figure 1 (a) Emulsion mixed with a simple rotor paddle the im-even distribution of mechanical energy on the liquids has caused a broad DSD. (b) Ultrasonically prepared emulsion the dispersed volume is to a high degree present as very small droplets in a narrowly distributed fraction of the population. 

The cell has two concentric rotating and fixed cylinders fitted with a syringe pump containing the premixed polydisperse emulsion. The inner cylinder is connected to a motor of variable speed and acts as the rotor, while the fixed outer cylinder is the stator. At high shear rates, the pre-mix emulsion pushed through the system by the syringe pump is converted to narrow size distribution emulsions. 

The numerical results showed that the stress induced mixing in rotor elements totally depends upon the process conditions and high rotational speed achieved the uniform mixing. The uniform mixing was expected when the polymer melt underwent narrow stress distribution in the flow channel. 

The stress magnitude s history of three maker-particles which have different residence time is described in Fig. 7. The curve oscillates periodically due to the screw rotation. We focus on the highest value of the stress level as circled in Fig. 7 and its distribution is estimated by Eq. 4. The bimodal stress distribution is obtained in the case of the rotor at low rotational speed in Fig. 8. The height of the distribution curve corresponds to the flow rate and about half of the polymer melt does not overpass the wingtip at lOOrpm. On the contrary, the KB and rotor at high rotational speed shows uni-modal distribution and uniform stress induced mixing is expected. 

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