The fundamental mechanisms of dynamics and growth of vapor bubbles and crystals in a solution of sucrose are considered in this paper on the basis of the general laws of heat and mass transfer in multiphase systems. It is assumed, that the system consists of two chemically neutral components: water and sucrose (a solution of sucrose) and three phases: liquid (solution), solid-state (crystal of sugar) and gaseous (vapor bubbles of water).). The equations of preservation and interphase interaction are written down, taking into account the specific properties of a sucrose solution. All those assumptions, on which the theory of multiphase heterogeneous systems is based, are accepted. Solutions for dynamics of the three-phase, two-components systems in an axial symmetrical channel are received in the limits of one-dimensional flow model. It is shown, that at low sucrose concentration in the channel initial overheating of liquid results in growth of vapor bubbles and dissolution of sugar crystals. At high sucrose concentration it is possible both, growth of bubbles, and growth of crystals at small initial overheating of a liquid. Thus, the particular conditions (temperature of a solution and its concentration) necessary for crystallization of sucrose in a solution can be found.
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