Author(s): Steve F. Daly; Keith D. Stolzenbach

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Keywords: No Keywords

Abstract: This paper applies quantitative approaches of large-scale industrial crystallization to the study of frazil Ice. The development of a crystal number continuity equation and a heat conservation equation can serve as a basis for predicting the size and distribution and concentration of frazil crystals. The key parameters in these equations are the crystal growth rate and the rate of secondary nucleation. The crystal growth rate is determined by the heat transfer rate from the crystals to the fluid, the intrinsic kinetics of the crystals, surface tension, and the mass transfer rates. Available data indicate that the growth of the major axis of frazil crystals is controlled largely by heat transfer. The heat transfer expression for disks suspended In turbulent flow is presented. The rate of secondary nucleation can be expressed as the product of three functions, which relate the energy transferred to crystals by collision and the number of surviving crystals produced by the collision. The secondary nucleation rate is found to be a function of the turbulent energy dissipation and a strongly nonlinear function of the form and magnitude of thee crystal size distribution. The number continuity and heat conservation equations are troublesome to solve simultaneously because they are nonlinear and dimensionally incompatible. However, the equations can be used in the development of models of frazil ice formation.

DOI:

Year: 1984