Modeling of processes of heat and mass transfer in microchannel heat exchangers of space-system engineering control systems

The work is devoted to the study of heat transfer in microchannels on the basis of filamentary monocrystals of silicon of the heat exchange elements for telecommunication systems, space technology, management module land-based. The aim of this work is to develop mathematical models and conduct numerical modeling of heat and mass transfer for a microchannel heat exchanger hybrid thermal protection system on the basis of silicon single crystals. The thermal protection system must ensure stable operation of the electronic equipment in a wide range of ambient temperatures (from minus 40 to plus 60 °C) and temperature control should be within ±0.1 °C. The overall dimensions of heat exchanger are correlated with the size of electronic components. A variant of the heat exchanger based on the matrix of filamentary crystals of silicon that allows you to create a large surface area providing high heat removal of up to 100 W/cm2 is offered. By the developed technology prototypes have been produced. The mathematical model that best describes the processes of heat and mass transfer in microchannel heat exchangers, defined the proper boundary conditions has been developed. Numerical modeling of heat and mass transfer has been conducted. The dependences of the differential pressure, temperature, flow cooler, identified approaches for determining geometric characteristics of effective edge-based single crystals have been built. The dependences of the temperatures of single-crystal fin from its height and spatial location have been determined. The critical modes of the system have been researched. To optimize the thermal and hydraulic characteristics of the proposed new design of heat-exchange elements made of single crystal silicon for further research has been offered.