Gakal P. Thermalhydraulic processes in the two-phase heat transfer loops of spacecraft thermal control systems

The subject of the study is thermalhydraulic processes in the two-phase flows of spacecraft thermal control systems, global efficiency indexes of spacecraft thermal control systems, closure relationships of thermalhydraulic processes mathematical models for microgravity conditions. The purpose is the investigation of laws governing of thermalhydraulic behaviors in two-phase flows, condensation heat transfer and pressure losses in two-phase flows in the microgravity conditions, global efficiency index forming. Methods of studying are methods of hydro and gas dynamics, thermodynamics, heat and mass transfer theory, probability theory and mathematical statistics, parametric identification, planning an experiment, similarity theory, and theory of numerical solution of algebraic and differential system of equations, fuzzy sets. Theoretical and practical results consists of mathematical and physical thermalhydraulic processes modeling approaches; method of global efficiency index forming of spacecraft thermal control system; database of heat transfer intensity during condensation and friction pressure losses in two-phase flow in microgravity conditions; loop heat pipe operability data stipulated by temperature field in the flat heater; structural and parametric synthesis of thermal control system of perspective telecommunication satellite; database of thermalhydraulic processes behaviors in the thermal control system in depends on a heat load, environmental temperature. Novelty of the results is the actual scientific problem solution of the complex investigation of thermalhydraulic processes in two-phase flows of the spacecraft thermal control systems. The realization level is - the proposed approaches, models, closure relationships are used in the research, manufacturing and educational practice, that are confirmed by three acts of implementation and using. Field of use is engineering thermal physics.