Chapt10

98 unlike the infinitesimally thin normal shock the

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Unformatted text preview: ed at the bottom of a dam spillway in a model test. It is very important that such jumps be located on specially designed aprons; otherwise the channel bottom will be badly scoured by the agitation. Jumps also mix fluids very effectively and have application to sewage and water treatment designs. | v v Fig. 10.11 Hydraulic jump formed on a spillway model for the Karnafuli Dam in East Pakistan. (Courtesy of the St. Anthony Falls Hydraulic Laboratory, University of Minnesota.) | e-Text Main Menu | Textbook Table of Contents | Study Guide 10.5 The Hydraulic Jump The principal parameter affecting hydraulic-jump performance is the upstream Froude number Fr1 V1/(gy1)1/2. The Reynolds number and channel geometry have only a secondary effect. As detailed in Ref. 16, the following ranges of operation can be outlined, as illustrated in Fig. 10.12: Classification Fr1 Fr1 Fr1 1.0: Jump impossible, violates second law of thermodynamics. 1.0 to 1.7: Standing-wave, or undular, jump about 4y2 long; low dissipation, less than 5 percent. 1.7 to 2.5: Smooth...
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This note was uploaded on 10/27/2009 for the course MAE 101a taught by Professor Sakar during the Spring '08 term at UCSD.

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