Abstract
The homogenization of the agitated batch and ensuring the suspension of particles are the most frequently encountered requirements in terms of mixing applications. These operations are affected by the flow of the agitated batch. The geometrical parameters of the mixing system, especially the shape of the agitator blade, affect flow and circulation in the agitated batch. The present work provides a general description of the most common processes in the agitated batch (blending and particle suspension), hydrodynamic parameters (flow in agitated batches, pumping and circulation capacity of impellers) and the geometrical configurations of the mixing equipment (shape of vessel, baffle and impeller, and their mutual arrangement) that influence the process. The dimensionless process characteristics of the agitator were derived by theoretical analysis. These characteristics were applied to evaluate an extensive set of experimental data with various geometric configurations of the mixing equipment. This study shows how the flow in the agitated batch, caused by the pumping and circulating effects of the agitators, affects the parameters and energy efficiency of these processes, depending on the geometric configuration of the mixing equipment. Moreover, the benefits of the hydrofoil impellers used for these mixing processes are presented.
Highlights
The mixing of liquid media is one of the most common operations in the chemical, biochemical, food and consumer industries
From the comparison of the homogenization time and, in particular, the energy needed for achieving the required degree of homogeneity in the agitated batch, given in Table 4 for agitators with curved blades (Figures 8 and 9), it is evident that the use of baffles will reduce the energy intensity
The homogenization of the agitated batch occurs because of the circulation flow caused by the pumping effects of the agitators, which depends on the shape of the blades and the geometric configuration of the agitator
Summary
The mixing of liquid media is one of the most common operations in the chemical, biochemical, food and consumer industries. The evaluation of experiments the required rotation frequency of the agitator so as to ensure the required process takes place in the in the form of suitable dimensionless process characteristics for thethe use of these results agitated batch and the correct power input of the agitator shaftwill is used forallow dimensioning driving system These design parameters, depending notchoice only onof thethe geometric configuration the mixing in the design of the operating equipment and the optimal geometricofconfigurations of the equipment (shape of vessel, inside the the types of agitators and their mutual geometric equipment, in terms ofinserts ensuring thevessel, required process takes place, and in terms of the arrangements) and on the physical–chemical properties of the agitated batch, are determined minimization of operating energy costs. Flow ininAgitated the design Batch of the operating equipment and the choice of the optimal geometric configurations of the equipment, in terms of ensuring the required process takes place, and in terms of
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