Problems of self-organisation and structure formation in disperse systems
Relevance of the work. Unlike closed thermodynamic equilibrium systems, disperse systems, in the presence of external gravitational forces, are always open, which necessitates the consideration of problems related to their self- organization. Purpose of the study - assessment of structure formation, dissipation of energy and memory of disperse systems. The methodology of the experiment. In evaluating the above mentioned tasks, a set of methods, including Maxwell's rheological viscoelastic fluid equation in substantive derivatives, the Fokker-Planck equation, as well as the method of separation of variables, were used to build a complete picture of the state evolution of the system. The results of the study. The research has shown that self-organization problems are characteristic of disperse systems of any type, accompanied by structure formation. Disperse systems are always open due to the presence of dispersed particles with a certain mass in the flow volume affected by the external gravitational and other forces. Self- organization of disperse media depends on the presence of interaction processes between the particles, leading to their coagulation and fragmentation, ultimately resulting in structure formation, and on the sedimentation stability. A disequilibrium between the phenomena of coagulation and fragmentation, associated with changes in external and internal parameters, contributes to a shift of the self-organization process in either direction. Another factor of self-organization is the deposition of particles and the stratification of the whole system, which is facilitated by the presence of particles of different sizes and the physical phenomena of coagulation and agglomeration. The inherited system memory of structured disperse systems is most often limited under real-world conditions, as shown by the nature of the evolution of the particle distribution over time. Conclusions. Studies have revealed conditions and factors of structure formation and energy dissipation in disperse systems. The conditions of hereditary memory of structured systems have been presented.