Investigation of flow in a curved converging channel

Georgiadou, Anastasia Damaskinidou (1980) Investigation of flow in a curved converging channel. University of Southampton, Doctoral Thesis.

Abstract

In the present investigation flow in a curved converging channel has been studied both theoretically and experimentally. The theoretical analysis involved the application of the continuity and momentum equations, in a cylindrical coordinate system, to a curved converging element the geometric characteristics of which are similar to those of the external flow. A numerical method is presented for the solution of this system of equations, which has been incorporated in a computer programme to predict all the necessary flow features in such a channel. The experimental study involved three-dimensional velocity measurements in four experiments having different flow characteristics. A flow visualization technique has also been used to illustrate the trajectories on the channel bed and at the water surface. Remarkably good agreement is seen between computed and experimental results of the tangential velocity distribution. Flow directions are also predicted quite accurately, especially in the central part of the cross-section. The agreement between the predicted and measured water surface configurations is also good. A further experimental study has been carried out on flow in a curved converging channel having a branch canal on its concave side. This part of the investigation attempts to clarify the flow behaviour in such a channel, to point out the affect of the branch on the upstream flow and to prove that a branching curved converging channel can successfully be used as part of a sediment exclusion device.

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