There exists no universally accepted technique for evaluating the functional status of equipment for high-viscosity mixing based upon generalized basic information such as flow patterns and shearing deformation characteristics. This paper deals with the measurement of flow patterns. After obtaining the overall flow patterns in a mixing vessel, circulation capacity and fluid deformations which cover information about energy dissipation were correlated with the homogenizing time. The physical meanings of C^nT^and C2=TM "]/Pvgcj[i, are interpreted by using a concept of striation thickness. A measure of an averaged dimensionless shear rate number l/Pvgcl/u ln ' s plotted against the dimensionless nearest distance between moving part and fixed wall in the mixing vessel. This diagram could give an useful comparison as to averaged shear rate characteristics for any device for high-viscosity mixing regardless of geometrical configuration. A novel technique is also proposed for quick evaluation of tha shear distribution in a given apparatus.
This pdper deals with an examination of the hypothesis for striation thickness by Mohr. The effect of viscosity ratio on striation thickness is examined in a cone rotor-type mixer as a uniform shear system, and it is concluded that the effect of the viscosity ratio might be negligible in a system where a minor component is inset in a miscible major component of different viscosity. The authors have shown the phenomenon of formation of particles of minor component in the range of viscosity ratio MdlPc>3 and £^//*c<0.6.
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