Thermodiffusion and vaporization of metal from levitated droplet IV. relations for experimental data analysis and their application for evaporation of iron

Abstract

In the present paper the mathematical relations for analysing experimental results obtained at levitated droplet vaporization were derived. The calculations resulted in a system of nonlinear equations where the unknown quantities characterize condensation rate, thermodiffusion and their temperature dependences. The numerical solution was performed for vaporization of iron in the flow of argon. The thermodiffusion and vapour condensation increase the vaporization rate 5.4-times at 2200 K. The thermodiffusion ratio is negative in order 10⁻³ and its temperature dependence is important. The temperature dependence of vapour condensation was determined with the accuracy of 2%, the rate constant of condensation was determined approximately as a consequence of experimental data inaccuracy.