Remote mixing technology using a square mixer

Authors

  • СВ Фесенко Украина

Abstract

Introduction The rapid development of one of the most promising sectors - biotechnology, has led to specific requirements for typical technological processes. One of the fundamental processes in this industry is the mixing process - the process of bringing into close contact two or more mobile phases with a stationary medium in order to obtain a uniform distribution of one phase in the volume of the other, to intensify the processes of heat and mass transfer, to intensify the chemical reaction. For example, the mixing process is found in almost every industry, but in most of these industries the question arises not only of implementing a high-quality process, as evidenced by the equalization of concentration throughout the volume of the medium, but also to prevent foreign components from getting into the medium, which is being mixed. The most common way to carry out the mixing process is to apply energy through mechanical stirring with a mixer. To implement the proposed method, it is necessary to introduce a shaft of a mixing device with a stirrer mounted on the shaft, but in this case a number of problems arise, the main one is the sealing of the shaft insertion point. Main difficulties in the simulation of mechanical mixing in the turbulent regime arise from the change in the scale of turbulence (the size of the vortex and the path of its mixing). In a small volume of the apparatus, the scale of turbulence is correspondingly small and the mixing is carried out more intensively than in a large volume of apparatus. Firstly, the shaft seal does not guarantee that the leakage of foreign microorganisms and contaminants from penetrating the apparatus’s volume, and secondly, the establishment of any seal results in a loss of friction power in it. Also, the main difficulties in modeling mechanical mixing in a turbulent mode arise due to a change in the scale of turbulence (the size of the vortex and its mixing path). In a small volume of the apparatus, the scale of turbulence is accordingly small and mixing is carried out more intensively than in a large volume of the apparatus. Another possible way is the supply of energy due to air or oxygen bubbles that pass evenly through the layer of the working fluid, this method is more appropriate from the point of view of preventing the ingress of foreign substances, but is accompanied by the formation of stagnant zones in the volume of the apparatus, and also has a significantly lower specific productivity in Comparison with mechanical energy supply. Aim of the study. The purpose of the study is to experimentally establish the characteristics of the radiation of an ultrasonic beam on the volume of a liquid, which houses a metal structure in the form of a square, located perpendicular to the axis of the vessel, placed with one precise attachment to the top on a fixed axis.

References

1

Published

2020-02-02

How to Cite

Фесенко, С. (2020). Remote mixing technology using a square mixer. Pridneprovskiy Scientific Bulletin, 6(662). Retrieved from http://www.rusnauka.com/index.php/rusnauka/article/view/1843