Determination of the maximum droplet diameter during centrifugal extraction, soil analysis, contamination and waste disposal

An analysis of the shape of the contact arc in the roll module was performed for the case when changes in the thickness of the material and the roller coating at each point of the contact zone occur in the radial direction to the roller axis. Mathematical models of the shape of the contact arc of the roll module were developed. Particular mathematical models of the contact arc shape were obtained for the cases when the material being processed is absolutely elastic, elastic-viscous, and plastic. It was determined that the shape of the contact arc in the roll module depends primarily on the geometric and deformation properties of the roller material and the roller coating.

Mathematical description of the interaction process in a roll module

Khurramov,

Nurmanov,

Imamnazarov

et al. 2024

Mathematical modeling and comparative analysis of baffle types in heat exchange equipment

Salin

2024

The development of digital technologies has significantly increased the effectiveness of production and research, especially in the oil and gas industry, where mathematical modeling plays a significant role in equipment design. This paper presents research aimed at developing digital twins of process equipment and focuses on heat exchangers with different types of baffles. The main focus is on comparing the effectiveness of segmental, helical, spiral and disk-ring type baffles as well as tube finning for heat transfer intensification. Numerical experiments using ANSYS CFX for modeling of hydrodynamics and heat transfer in shell and tube heat exchangers with different baffle designs have been carried out. The results showed that disk-ring baffles provide the highest effectiveness of heat transfer, but lead to inhomogeneous velocity and pressure distributions. Spiral baffles showed a significant improvement in heat transfer with relatively low hydraulic resistance, despite difficulties in fabrication and installation. Segmental baffles remain the most popular due to their simplicity and low cost, while rod baffles require further research due to their low effectiveness and high resistance. The paper concludes by recommending the development of digital twins and their use in equipment design, modernization and operation to select optimal mode parameters and solve structural optimization objectives, which has a positive effect on the effectiveness and reliability of equipment in operation.

Comparative study of heat transfer in apparatuses with turbine and blade agitators

Ponikarov,

Salin

2024

In the framework of this research, modeling of flows and heat transfer in apparatuses with turbine and blade agitators using the ANSYS CFX software package has been carried out. The purpose of the work is to create digital prototypes of apparatuses with stirring devices to improve the effectiveness of technological processes of various chemical and petrochemical industries. Modeling was carried out on the basis of three different objectives, including the processes of water heating and mixture of water with glycerol. In each objective, the heating and circulation characteristics of the liquid during mixing using turbine and blade agitators were investigated. The effects of parameters such as apparatus wall temperature, water and mixture flow rate, rotation speed and agitator type on the time characteristics of reaching steady-state were evaluated. The simulation results demonstrated that turbine and blade agitators provide more efficient mixing and heating of the liquid compared to blade agitators, all other conditions being equal. Fluid temperatures reached higher values in a shorter time when turbine agitators were used, making them preferable for processes where intensive mixing and rapid heating are required. This approach can be useful to optimize mixing processes on production lines and improve the energy efficiency of production facilities.