1. Geometry Impact on Flow Characteristics Inside River Intakes.
- Author
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Abdul-Muttalib, Muhammad, Khater, Abd Elhamid, Refaiey, Mahmoud, and Dewedar, Ahmed K.
- Subjects
INTAKES (Hydraulic engineering) ,WHIRLPOOLS (Water currents) ,FLOW velocity ,GEOMETRY - Abstract
Intake is an open channel that usually has a non-uniform flow along its length. The pattern of the flow in lateral intakes is fully three-dimensional. That is why many studies were carried out on the flow characteristics at the intakes. Velocity and direction change in lateral intakes lead to non-consistency and recirculation of the flow. As the result of these whirlpools, depositions are accumulated inside intakes which consequently decrease intake efficiency. High maintenance cost is regularly paid in order to dredge the sedimentation areas and to guarantee and maintain efficiency. The aims of this study were to get a suitable design of the lateral intakes to improve the flow characteristics at junctions. This study is conducted by using a numerical Software Delft3D-FM which used in predicting flows pattern which validated and employed in a parametric study. The model dimensions were assumed based on a real project data at Nile River in Assiut, Egypt. In this study, four models with sharp edges and different bed levels were presented to investigate flow separation zones at different angles of the intake entrance. In order to control the model accuracy in predicting the dimensions of the separated areas, the results were compared with the base configuration which has a flat horizontal bed level of intake. Comparisons between the predicted and the initial configuration velocities at the considered sections indicate that the model captures most of the trends with sensible accuracy. It is concluded that configuration number 4 which has two-fold baffle walls located on the right side has a significant effect on improving flow velocity, circulation zone length, reverse flow width as it enforces the flow to the inner side achieving a good flow distribution inside the intake. The results indicate also that the optimal angle of lateral intake which gives minimum length and width of separation zone is at θ = 30°. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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