Nikitin D. Thermophysical modeling of micro-channel thermal control systems in elec-tronic devices.

The dissertation is devoted to development of ther-mophysical models of the microchannel thermal con-trol systems of electronic devices. Simulation of the velocity fields, pressures and temperatures in micro- and macrochannels for different types of heterogeneous surface (regular, casual and fractal) confirmed similar-ity of processes of impulse transfer at identical scope terms. Classic correlations for the coefficients of heat transfer and hydraulic resistances at the flows in ordi-nary channels, mainly, remain the same for microchan-nels, if scope terms and geometrical limitations are cor-rectly formulated. Approach to the increase of efficiency of the systems of taking of warmth from the sources of high closeness of energy due to application of treelike networks of mi-crochannels was developed in the work. The compara-tive analysis of efficiency of the cooling systems on the basis of microchannel networks with a two-phase working fluid showed that thermal efficiency of the gas-gas systems with theisolated and separated zones are practically identical. Numerical and theoretical es-timations of overall sizes of microheat pipes from point of providing of possible heat and mass transfer terms, and also from positions of competition to metal heat ways, allowed asserting that for practical application improbable microheat pipes with diameters less than 1mm.