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Paper Information

Journal:   WATER AND WASTEWATER   SPRING 2010 , Volume 21 , Number 1 (73); Page(s) 15 To 24.
 
Paper: 

EFFECT OF NON SUBMERGED VANES ON SEPARATION ZONE AT STRONGLY-CURVED CHANNEL BENDS, A LABORATORY SCALE STUDY

 
 
Author(s):  AKHTARI A.A.*, ABRISHAMI J.
 
* DEPT. OF ENG., RAZI UNIVERSITY, KERMANSHAH
 
Abstract: 

Bends along open channels always pose difficulties for water transfer systems. One undesirable effect of bends in such channels, i.e. separation of water from inner banks, was studied. For the purposes of this study, the literature on the subject was first reviewed, and a strongly-curved open channel was designed and constructed on the laboratory scale. Several tests were performed to evaluate the accuracy of the lab model, data homogeneity, and systematic errors. The model was then calibrated and the influence of curvature on flow pattern past the curve was investigated. Also, for the first time, the influence of separation walls on flow pattern was investigated. Experimental results on three strongly-curved open channels with a curvature radius to channel width ratio of 1.5 and curvature angles of 30o, 60o, and 90o showed that, in all the cases studied, the effect of flow separation could be observed immediately after the curve. In addition, the greatest effect of flow separation was seen at a distance equal to channel width from the bend end. In the presence of middle walls and flow separation, the effect of water separation reduced at the bend, especially for a curvature of 90o.

 
Keyword(s): OPEN CHANNELS, STRONGLY-CURVED CHANNEL, SEPARATION WALL, FLOW SEPARATION, SEPARATION ZONE
 
References: 
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