Heat and mass transport at unsteady sublimation of single metal-organic particles in the gas-carrier flow

Abstract

The results of experimental research and numerical modeling of convective heat and mass transfer during the sublimation of spherical particles of beta-diketonates of metals Cr(acac)3 and Zr(dpm)4 in a high-temperature flow of an inert gas (argon or helium) are presented. The sublimation process is visualized. The temperature and particle size dynamics are obtained. The effect of the carrier-gas properties on the sublimation intensity of the particles with different initial diameters in the temperature range from 200 to 330 ºС is analyzed. It is shown that under the conditions of a high intensity of substance removal from the phase transition surface, the time for complete sublimation of the sample of Cr(acac)3 and Zr(dpm)4 may be less than the time, required to establish an equilibrium temperature between the precursor particle and the vapor-gas flow.