Kutnyi B. Development of the theory of heat and mass transfer processes during crystallization and dissociation of gas hydrates

The dissertation is devoted to the complex solution of problems of synthesis and dissociation of gas hydrates by developing a new approach to studying the dynamics of gas - steam bubble structures in the phenomena of hydrate formation, boiling, in order to substantiate effective methods of intensification of technological processes in dispersed environments. This approach is based on a detailed analysis of nonequilibrium thermodynamic processes that shape the behavior of a single gas-bubble during the transient process to equilibrium, as well as on maximum consideration of all thermophysical and thermodynamic factors and phase transitions that determine the specific nature of dynamic, thermal and thermal occur in gas-liquid media. Within the framework of this approach, universal mathematical models have been developed, which from a single thermodynamic position adequately describe the dynamics of a single bubble, phase transition processes and hydrate formation in a wide range of regime parameters. Based on these models, computer applications have been developed to solve specific problems. As a result of a large number of computational and field experiments, new important information was obtained and new previously unknown patterns of behavior of bubble systems in the phenomena of resonance, boiling and hydration were established, which significantly expanded our understanding of the nature and character of these phenomena. The methodology of calculation of bubbling devices for synthesis of gas hydrates is developed in the work, which is confirmed by experimental researches. With the help of theoretical and experimental researches dependences for optimization of the account of thermobaric conditions, time, concentration of surfactants, design features of the device and technology of synthesis of gas hydrates are established. The research in the field of dissociation of gas hydrates was further developed, in particular in the case of surface and volume heat supply. Equations are obtained to determine the conditions of self-preservation and intensive dissociation of the gas hydrate massif. Mathematical models of dissociation of a gas hydrate massif under the conditions of action of ultrahigh - frequency electromagnetic radiation are realized.