Radial and tangential velocity profiles in an annular flume with granular bed

Annular flume;Secondary flow;Ultrasound velocity profiler (UVP);Velocity distribution

San Juan Blanco, Jorge Emilio ; Garcia ; Marcelo H.

关键词: Annular flume;    Secondary flow;    Ultrasound velocity profiler (UVP);    Velocity distribution;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/92679/SANJUANBLANCO-THESIS-2016.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Annular flumes become convenient facilities to produce undisturbed flows to study eco-hydralic and cohesive sediment transport, among others. These flumes are ring-shape channels that produce curved flow by rotating their lid and/or tank. Thus, momentum in the tangential direction is transferred along the water column by the lid rotation. Because of the circular motion, centrifugal acceleration makes the flow helical rather than tangential and unidirectional.The objective of this work was to assess the applicability of the Engelund's formulation (Engelund, 1975) on the Ven Te Chow Annular Flume at the University of Illinois Urbana-Champaign. In order to accomplish this goal, tangential and radial velocity profiles were measured under three flow depths and five lid rotation conditions using Ultrasound Velocity Profiler (UVP-DUO). Later, they were contrasted with those computed using the Engelund's formulation. Despite some similarities of the measured tangential profile with the one computed using the Engelund's formulation, it was found that the formulation is not suitable for the Ven Te Chow Annular Flume. The strong curvature of the flume and the large depth-to-width ratio played a major role on defining the interaction of the secondary flow with the tangential velocity profile.