Author(s): C. Park; R. Gerard
Linked Author(s):
Keywords: No Keywords
Abstract: Frazil particles have shown a propensity to flocculate within the flow. Frazil disposition should therefore depend on the hydraulic characteristics of the flocs rather than, or at least as well as, on those of the individual frazil particles. Furthermore, the relation between the mass of frazil produced and the volume of a frazil deposit will depend on floc porosity. Hence the hydraulic characteristics of flocs would seem important for freeze-up process simulation. As an initial contribution to defining the hydraulic characteristics of frazil flocs, measurements were made of the hydraulic characteristics of artificial 'frazil flocs' fabricated from plastic discs. It was found that the drag coefficient of these flocs was significantly higher than for a solid smooth sphere of the same size and bulk density. This is doubtless due to the sharp-edged roughness of the floc surface, although little trend could be detected with disc Reynolds number, which is a measure of this roughness. There was no definite trend in drag coefficient with floc shape or, beyond its contribution to bulk density, with floc porosity.
Year: 1984