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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Experiments on flow separation at the inner bank of open-channel bends
Experiments on flow separation at the inner bank of open-channel bends
Author : KOEN BLANCKAERT(1,2), MIAO WEI(1,2), JORIS HEYMAN(3), DANXUN LI(2) & ANTON J. SCHLEISS(1)
ABSTRACT
In spite of its hydraulic and morphologic importance, the conditions of occurrence of flow separation at the inner bank of
open channel bends are still not known. In a series of 23 experiments in a laboratory open channel bend with flat sand
bed, it was investigated how the process of inner-bank flow separation depends on two control parameters: the ratio of
flow depth H to minimum radius of curvature R, and the Froude number Fr. The Froude numbers investigated were 0.1,
0.2, 0.3, 0.4 and 0.5 and the H/R values investigated were 0.038, 0.053, 0.077, 0.112 and 0.153. All flow conditions
concerned strongly curved subcritical flow. Flow did separate from the inner bank in all experiments, but recirculation
zones with reversed velocities did not develop. Surprisingly, the flow separation did not show any dependence on Fr. The
point of flow separation moved farther downstream in the bend with increasing H/R.
File Size : 585,731 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 18/08/2015
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