Innovation to ensure sustainable development in the coal industry

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.

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

Ponikarov,

Salin

2024

Determination of droplet size and flow breakup mechanisms in centrifugal contact devices

Salin

2024

This article investigates the mechanisms of droplet breakup and the determination of droplet size in centrifugal contact devices, focusing on phase separation and mass transfer processes. The study highlights the critical role of turbulent pulsations and the rotational speed of the rotor in influencing droplet deformation and breakup. Based on the Kolmogorov-Obukhov theory of turbulence, the paper presents theoretical and experimental approaches to predict droplet behavior and optimize the geometry of contact devices. Key findings demonstrate that increased rotor speed and nozzle design significantly impact droplet size reduction, improving interaction efficiency between phases. The results are applicable to the optimization of centrifugal apparatuses used in chemical processes and phase separations.

Determining actual phase velocity for flow hydrodynamics modeling in centrifugal apparatus packing

Salin

2024

This paper presents the results of a performance study of nozzle centrifuges designed to optimize mass transfer processes under centrifugal field conditions. The study includes an analysis of the design features of the apparatus, such as the geometry of the nozzles and rotors, and their influence on the efficiency of phase separation. A theoretical framework based on the Bernoulli equation and similarity criteria (Froude, Reynolds and Weber) is presented and adapted to describe the hydrodynamics of two-phase flows. Experimental data show that the use of X-shaped and wave-shaped nozzles helps to reduce phase slippage and increase apparatus performance. The developed dependencies for calculating the actual circumferential flow velocity can be used for numerical simulation and further optimization of centrifugal apparatus design.