Dmytro K. Investigation of critical heat fluxes at boiling of nanofluids

The work is devoted to the development of new nanofluids, the study and synthesis of their thermophysical characteristics, as well as the increase of the efficiency of the process of heat exchange during boiling, the experimental study of critical heat fluxes and the mechanism of heat exchange during boiling. The composition and technology of obtaining new HF's and testing them as heat carriers have been developed. The influence of the composition, size, structure and concentration of the dispersed phase, as well as the degree of disaggregation and the content of the dispersant on the parameters of the boiling and heat exchange parameters of HF are studied. Definition of optimal composition of HF's, method of their preparation, and possible directions of practical use. For the first time in Ukraine and in the world resistant to boiling and cooling HF are designed based on aluminosilicates, titanium dioxide and carbon nanotubes (CNT), which are capable of increasing the CHF and avoiding the boiling crisis in the generally accepted sense. Their physical and thermophysical characteristics are determined, and the mechanism of anomalous growth of their thermal parameters during boiling is determined. High thermal parameters and stability to boiling of aluminosilicate HF's make them promising coolants for power engineering, as well as means of emergency cooling for nuclear reactor enclosures.