The paper presents the results of research on the processes occurring during the flow of gases containing solid particles and water vapor through a particulate filter. In the paper, special attention was paid to the phenomena of thermal condensation, which occur on the surface of solid particles, affecting the efficiency of particle aggregation and their separation in the filtration system. Advanced simulation tools based on the CFD (Computational Fluid Dynamics) method were used for the analysis, enabling modeling of complex mixtures. The paper focuses on the vortex flows that arise inside the filter, which significantly determine the processes of mass transport, heat exchange and thermal condensation. This phenomenon is crucial for improving the efficiency of filtration, because it leads to an increase in the volume of particles and facilitates their capture. Numerical analysis allowed for a detailed examination of the distribution of flow parameters, such as velocity, pressure and humidity, and their effect on the condensation and separation processes taking place. The research results indicate that thermal condensation significantly depends on the flow conditions, including gas temperature and humidity, as well as on the dynamics of vortex flows. The data obtained can be used to design a filter with optimized geometry and operating conditions that minimize energy losses and increase filtration efficiency. The publication emphasizes the role of CFD methods in studying complex processes in filtration systems and their application in developing more sustainable technologies.