Chapt10

684 in noncircular channels there are also secondary

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Unformatted text preview: y motions similar to Fig. 6.16 for closed-duct flows. If the channel curves or meanders, the secondary motion intensifies due to centrifugal effects, with high velocity occurring near the outer radius of the bend. Curved natural channels are subject to strong bottom erosion and deposition effects. The One-Dimensional Approximation 0.5 2.0 1.5 2.0 1.5 1.0 1.0 0.5 Trapezoidal channel Triangular channel 2.0 0.5 1.5 1.0 2.5 2.0 0.5 Shallow ditch 1.5 1.0 Pipe 2.5 2.0 1.0 | v v Fig. 10.1 Measured isovelocity contours in typical straight openchannel flows. (From Ref. 3.) 2.5 1.5 1.5 1.0 0.5 2.0 0.5 Natural irregular channel | e-Text Main Menu | Textbook Table of Contents Narrow rectangular section | Study Guide 10.1 Introduction 661 b0 y V Fig. 10.2 Geometry and notation for open-channel flow: (a) side view; (b) cross section. All these parameters are constant in uniform flow. A y θ S = tan θ Horizontal x P (a) Rh = A P (b) With the advent of the supercomputer, it is possible to make numerical simulations of complex flow patterns such as in Fig. 10.1 [23]. However, the practical engineering...
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