Modeling of heat-hydraulic characteristics of microchannel heat transfer elements based on the matrix of silicon monocrystals

Abstract

The construction of a heat exchange element based on a matrix of silicon whiskers for thermal stabilization systems of miniature heat sources with specific power up to 100 W / cm² operating over a wide range of ambient temperatures is proposed. Based on the developed mathematical model of convective heat transfer in a microchannel compact heat exchanger with a developed heat exchange surface, numerical simulation of the hydrodynamics and heat transfer processes for various configurations of microchannel insertions was carried out. Fields of pressures, flow velocities, coolant temperatures and matrix from silicon single crystals have been obtained in a wide range of coolant flow rates, criteria dependencies for the Nusselt number and pressure losses of various geometric conigurations of heat exchangers have been determined. Critical operation modes are investigated, optimization directions are proposed. According to the developed technology, prototypes for testing have been manufactured.