Abstract
In the present paper, we describe numerical simulation of process which produces nanoparticles by hydrothermal synthesis in supercritical phase, where the reactants and the hot water are mixed in the reactor and consequently nanoparticles precipitate through chemical reaction, nucleation and crystal growth processes. The mathematical model of the process shown here links the kinetics of chemical reaction, nucreation and crystal growth to the thermo-fluid dynamics in a wide range of temperature below and above the critical point, at which the themophysical properties such as density change very significantly.