Abstract

This study is devoted to mathematical modeling of the process of directional solidification of a binary melt with a two-phase zone. The paper considers the crystallization process from top to bottom, caused by cooling of the upper boundary. The melt located below the two-phase zone is in a state of intense convective motion. The nonlinear mathematical model of the solidification process is described by the equations of heat and mass transfer in the two-phase zone and the molten phase in the presence of a moving boundary of the phase transformation. These equations supplemented with the equation of state as well as the corresponding boundary and initial conditions are analytically solved in a parametric form. The nonstationary temperature and concentration distributions, and the solid phase fraction are found in the two-phase zone and liquid phase. The phase transition boundary “two-phase zone - liquid phase” is found as a function of time.

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