An Analysis of the Influence of the Properties of Nanodispersed Systems on the Design of Technological Equipment

Currently, there is a large number of dispersed and nanodispersed materials used in the manufacturing industry. They have various physicomechanical and physicochemical properties that have to be taken into account when developing and using various technological equipment as well as during technological processes. One of the main technological processes is mixing. Being sometimes auxiliary, this process is widely used in many industries, and, ultimately, determines the quality of the finished product. The influence of the rheological properties of the components to be mixed, both on the process of preparing the mixture and on the design of the equipment, has long been known. However, it is challenging to design mixing processes and mixers without taking into account such characteristics of dispersed materials as density (bulk and intrinsic), particle size and shape, coefficient of internal and external friction, hygroscopicity, adhesiveness as well as others. Usually, when considering technological processes and developing equipment, the issues of productivity, process time, energy consumption are given priority. At the same time, the influence of geometric parameters of the equipment on the mixing process and the dynamics of the movement of dispersed materials in the reaction volume has not been sufficiently studied. To address this issue, the authors examined the mixing process of dispersed materials of various sizes and bulk density using the example of a gravity mixer. The main factors affecting the quality of mixing and design parameters of the equipment for processing dispersed materials were established. Practical recommendations are given for specialists involved in the design of mixing equipment. These recommendations are general in nature, since it is problematic and indeed erroneous to give specific recommendations due to the large variety of dispersed materials and, accordingly, their physical and mechanical characteristics, as well as the equipment features.

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