Design mixer

It is seldom possible to specify an initial mixer design requirement for an absolute bubble size prediction, particularly if coalescence and dispersion are involved. However, if data are available on the actual system, then many of these correlations could be used to predict relative changes in drop size conditions with changes in fluid properties or impeller variables. 

Side Entering describes a mixer design whieh has a horizontal shaft entering through the side of a mixing vessel. 

Standard Geometry describes a vessel and mixer design based on a fluid depth equal to vessel diameter and a top-entering impeller having a diameter equal to 1/3 of vessel diameter and located with a clearance of 1/3 of vessel diameter above the bottom of the vessel. 

During liquid makeup produetion, eolor pigments (i.e., solid having identieal partiele size) are added to the produet via a mixer. In the pilot plant, this mixer runs at 6,700 rpm and has a diameter head of 0.035 m. Full-seale produetion is geometrieally similar and has a mixer head diameter of 0.12 m. Determine the speed of the full-seale produetion mixer head. What additional information is required for the motor to drive this mixer Assume that power eurves are available for this mixer design, and the seale-up basis is eonstant power/unit volume. 

The size and shape of the vessel to be used for the mixing operation is important in achieving the desired mixing results therefore, this aspect of the design must accompany the actual mechanical mixer design/sizc selection. 

Variation in the actual brake horsepower required to operate a mixer is the primary indicator of its performance envelope. Mixer design, whether propeller- or screw-type, is based on the viscosity of both the incoming and finished product. These variables determine the brake horsepower required to drive the mixer, which will follow variations in the viscosity of the products being mixed. As the viscosity increases so will the brake horsepower demand. Conversely, as the viscosity decreases, so will the horsepower required driving the mixer. 

Heywixh). N. I.. Viney, L. J., and Stewart, 1. W. Inst. Chem. Eng. Symposium Series No. 89. Fluid Mixing ]] (1984) 147. Mixing efficiencies and energy requirements of various motionless mixer designs for laminar mixing applications. 

To summarize, the kinetics of the silanization reaction are strongly influenced by the efficiency of the devolatilization process. The degree of devolatilization mainly depends on processing conditions (e.g., rotor speed and fill factor), mixer design (e.g., number of rotor flights, size of the mixer), and material characteristics. The diffusion coefficient of the volatile component in the polymeric matrix is of minor influence. 

The type of internal mixer designed by F.H. Banbury the name Banbury is often erroneously applied to any type of internal mixer. Barium Sulphate... 

Case-based reasoning has earlier been used for instance for equipment design. Koiranen and Hurme (1997) have used case-based reasoning for fluid mixer design and for the selection of shell-and-tube heat exchangers. They have included an estimation of design quality for the case retrieval beside technical factors. 

Mixing sections are cut into the biiiet next using the miiiing machine and iathe combination, as shown in Fig. 10.29(a). Depending on the mixer design, cutting these sections tends to be more time consuming. 

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

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