A Conceptual Model for Vertical Frazil Distribution in Turbulent Flowsby C. P. Liou, Univ of Idaho, Moscow, United States,
M. G. Ferrick, Univ of Idaho, Moscow, United States,
Document Type: Proceeding Paper
Part of: Cold Regions Engineering
A conceptual model is presented for the evolution of frazil over depth in a turbulent flow. The net upward migration due to buoyancy of the frazil is opposed by intermittent mixing induced by large energy-containing eddies. A surface renewal model is adopted to describe the large eddy mixing. Averages over an ensemble of discrete local volumes for the concentration profile, surface age and surface layer thickness are obtained with a probability density function. A dimensionless surface renewal frequency characterizes the frazil distribution at equilibrium as either well-mixed or layered. The model provides a physical basis for understanding the transition between these conditions and is consistent with existing empirical criteria and field data.
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