There will be energy dissipation in the exit flow

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Unformatted text preview: book Table of Contents | Study Guide 678 Chapter 10 Open-Channel Flow High tailwater Subcritical y1 Gate Gate 1 Dissipation V1, y1 V1, y1 y Vena contracta V2, y2 2 V2, y2 Supercritical E E1= E2 (a) (b) (c) Fig. 10.10 Flow under a sluice gate passes through critical flow: (a) free discharge with vena contracta; (b) specific energy for free discharge; (c) dissipative flow under a drowned gate. 10.5 The Hydraulic Jump In open-channel flow a supercritical flow can change quickly back to a subcritical flow by passing through a hydraulic jump, as in Fig. 10.5. The upstream flow is fast and shallow, and the downstream flow is slow and deep, analogous to the normal-shock wave of Fig. 9.8. Unlike the infinitesimally thin normal shock, the hydraulic jump is quite thick, ranging in length from 4 to 6 times the downstream depth y2 [16]. Being extremely turbulent and agitated, the hydraulic jump is a very effective energy dissipator and is a feature of stilling-basin and spillway applications [16]. Figure 10.11 shows the jump form...
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