Internal mixers simulations

Nassehi, V. and Ghoreishy, M. H. R., 1997. Simulation of free surface flow in partially filled internal mixers. Int. Poly. Process. XII, 346-353. 

An analysis of the flow behavior which is more or less confirmed by numerical simulations is presented by Leblanc. " The total flow in an internal mixer (tangential type) can be divided into a laminar, circulating flow which is pushed by the rotor tip, an axial directed flow, as an effect of the helix angle between axis and rotor wing and a leakage flow between rotor tip and mixing chamber waU (refer to Figure 35.6), or... 

Until the 1980s, most simulations of polymer operations related to thermoplastics problems. The special processing machinery of the rubber industry had receive little attention. It is only in the late 1980s that realistic simulations appeared for internal mixers [CIO, Cll, H20, H21, K6-8, W19] and pin barrel extruders [B31, B32, B34, K22]. These have used primarily lubrication theory-based simulations. 

The long continuous mixerfLCM), a new type of mixer, not only exhibits the good compounding properties of the internal mixer, but it also able to process continuously. A finite element analysis of the blending process of LCM with S-shaped rotors was carried out using ANSYS software. With 70 phr POE, 10 phr EPDM and 20 phr LDPE as the experimental material studied, the distribution law of pressure and velocity field was simulated. The effects of velocity, pressure and the index of power law flow on blending quality and output were also analysed from the simulated results. 6 refs. 

M 79] [P 69] Mass contour fraction plots were simulated for gas mixing in three T-type mixer designs with internals (four sub-sections) at an inlet velocity of 2.0 m s-1 [46]. It turned out that the inclined design gave the best results. 

Simulating Flows in Internal Batch Mixers with 2-D Models. 871... 

This section presents various examples and applications of three-dimensional simulation using finite element and boundary element techniques. These are presented to offer the reader an idea of what is possible with the current state-of-the-art of simulation programs. As examples, the authors have chosen cases that are of great interest to the academic, as well as, the industrial research community. These are internal batch mixers, extrusion dies and extrusion mixing sections. 

The use of a laboratory mixer in the simulation of industrial scale internal mixing of robbers is described. The formulation used in the stutfy was a carbonblack filled blend of polybutadiene, NR and SBR. 1 ref. 

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