Rotor Geometry

Figure 3.56 The rotation-barrier profile for CH3CH3 in (a) fully optimized and (b) idealized rigid-rotor geometry, showing the total energy Etotai (circles, solid line), vicinal cch-cch stabilization iw (circles, dotted line), and steric energy -Enteric (squares, dashed line).

Fig. 20. Internal mixer design showing (a) cross-sectional view of constructional features and (b) typical rotor geometries [129]...

Two-stage rotors are also available for continuous mixers (Fig. 22), which incorporate a second screw section to enable down-stream feeding of additives such as heat or shear sensitive fillers, or extraction of volatiles from the mixture [147]. For a fixed rotor geometry, rotor speed, fiow rate, barrel temperature and orifice opening are the principal operational variables which control mixing intensity. 

L. N. Valsamis and E. L. Canedo, Effect of Rotor Geometry and Operating Conditions on Mixing Performance in Continuous Mixers An Experimental Study, SPE ANTEC Tech. Papers, 37, 629-632 (1991). 

In high force dispersion devices, ultrasonication is used today especially for the homogenization of small quantities, whereas rotor-stator dispersers with special rotor geometries, microfluidizers, or high-pressure homogenizers are best for the emulsification of larger quantities. 

Coal slurry feeding into pressurized gasification reactors Optimisation of rotor geometries in mbber mixers Extrasion cooking of food and feed Closed loop quality control in extrasion Twin-screw extmders for recycling Compounding of biodegradable plastics... 

The target efficiencies tj < for the collision velocity and 7g < 1 for the influence of the rotor geometry take into account deviations from a modelling based on assumptions valid for an ideal system. The letter denotes the volume shape factor. Data for the solid material parameters Hy,n, and r/(K and further information can be found in Mersmann (2001). Experimental data on the width of the metastable zone valid for the presence of mother crystals are given... 

Figure 3.8 Mixing chamber and rotors of chaotic mixer, (a) Note that one of the rotors is exposed to the camera in order to ensure easier recognition of cylindrical rotor geometry, (b) The schematic of chaotic mixing chamber. R (the rotor radius) is 12.5 mm 9.0 cm x 7.5 cm and d (the mixing gap) is 12.7 mm. The total...

Fig.1 Rotor geometries of the tangential mixer Werner Pfleiderer GK-2 and the intermeshing mixer Francis Shaw K1 Mark 4 Intermix.

The intermeshing rotor type mixer was a Francis Shaw K1 Mark 4 Intermix, with a chamber volume of 5300 cm, operated at a fill factor of 54%, being the optimum for such a type of mixer. Rotor speeds of 50 rpm were used, ram pressure of 3 bars (plunger pressure), and wall temperature of 50°C. The rotor geometries of both mixers are shown in Fig. 1. 

Speed Clearances Rotor geometry Cooling efficiency... 

A major problem in cooling rubber, in any process, is its inherently poor conductivity, which means that it is only cooled where it touches a cool surface. Thus, total heat removal depends on the area of the coohng surface and also on the way in which fresh rubber surfaces are moved into contact with that cooling surface. In internal mixers this depends mainly on the geometry of the rotors. Mixers with intermeshing rotors are less influenced by the friction or adhesion between the rubber and metal, and are, therefore, less sensitive to starting temperature. Rotor geometry also affects the overall heat transfer coefficient in a mixer. ... 

In summary, this work showed that conventional rotor geometries, both tangential and intermeshing, can be improved in terms of greater working volume, quicker incorporation, better mixing, and better temperature control. 

The mass penalty associated with redundant alternators is 10 kg for a 100 kWe alternator and 20 kg for a 200 kWe alternator. The additional mass for a second set of stator windings is less than the mass of an additional alternator. Most of the failure modes that are made survivable with redundant alternators are made survivable when dual stator windings are utilized. The increased mass and changes in rotor geometry that would result from the use of dual alternators would require additional study and analysis of the Brayton rotor dynamics. 

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