Author(s): Robert Boou
Linked Author(s):
Keywords: No Keywords
Abstract: Annular flumes are frequently used for the study of erosion and/or deposition of fine sediments. The curvature of the flow in annular flumes leads to secondary flows which can be counteracted but not completely annihilated by rotating the flume itself in opposite direction to the lid in a rotating annular flume. Because of the small fall velocities of fine sediment the remaining secondary flow limits the use of rotating annular flumes for the direct study of deposition of fine sediment in free surface flow. However, these flumes remain useful if the complete complex flow pattern is taken into account. Sufficient information on the flow requires accurate computations, in particular near the optimum ratio of the rotational velocities of flume and lid. Validation with extensive measurements showed that the standard k-e model does not reproduce the secondary flow pattern sufficiently well to be useful for deposition or sediment transport studies.
Year: 1997