Mixing Efficiencies

Foi a veiy liigli quality baiiiei (p oo), the separative capacity of a stage having a mixing efficiency of 100% and operating at a cut of one-half would be ... 

Between 1 s and 1 min specific contact time, conduction heat-transfer performance decreases theoretically as the 0.29 power of contact time. This is consistent with empirical data from several forms of indirect-heat dryers which show performance variation as the 0.4 power of rotational speed (21). In agitator-stirred and rotating indirect-heat dryers, specific contact time can be related to rotational speed provided that speed does not affect the physical properties of the material. To describe the mixing efficiency of various devices, the concept of a mixing parameter is employed. An ideal mixer has a parameter of 1. 

Interstage Mixing Efficiencies Mixing or stage efficiencies rarely achieve the ideal 100 percent, in which solute concentrations in overflow and underflow hquor from each thickener are identical. Part of the deficiency is due to insufficient blending of the two streams, and attaining equilibrium will be hampered further bv heavily flocculated sohds. In systems in which flocculants are used, interstage effi-... 

Vortex formation leads to a considerable drop in mixing efficiency and should be suppressed as much as possible in practical applications to increase the homogenizing effects of mixers. The preferable method of vortex suppression is to install vertical baffles at the walls of the mixing tank. These impede rotational flow without interfering with the radial or longitudinal flow. Figure 11 illustrates such a system. 

Despite the utmost importance of physical limitations such as solubility and mixing efficiency of the two phases, an apparent first-order reaction rate relative to the olefin monomer was determined experimentally. It has also been observed that an increase of the nickel concentration in the ionic phase results in an increase in the olefin conversion. 

Construct Lines I and 2 Repd Propeller Mixing Efficiency of 54%... 

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. 

Estimation of Mixing Efficiency by Flow-field Mapping... 

The main driver was to develop a laboratory-scale micro-channel process and transfer it to the pilot-scale, aiming at industrial fine-chemical production [48, 108]. This included fast mixing, efficient heat transfer in context with a fast exothermic reaction, prevention offouling and scale-/numbering-up considerations. By this means, an industrial semi-batch process was transferred to continuous processing. 

Figure 4.88 Flow patterns, visualized by formation of the colored ylide intermediate, allowing one to judge on mixing efficiency [13],...

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