Chapt10

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Unformatted text preview: rt (c) 8(2.285)2]1/2 [1 e-Text Main Menu y1 Percentage loss | V2 1 2g (100) 1.25 hf E1 Textbook Table of Contents (8.0)2 2(9.81) 100(0.625) 4.51 | 4.51 m 14 percent Study Guide Ans. (e) 682 Chapter 10 Open-Channel Flow The power dissipated per unit width is Part (f) Power (9800 N/m3)[10 m3/(s m)](0.625 m) gqhf 61.3 kW/m Ans. (f) 3 Part (g) 3 q (1000 kg/m )[10 m /(s m)] Finally the mass flow rate is m ˙ the temperature rise from the steady-flow energy equation is Power dissipated or 61,300 W/m 10,000 kg/(s m), and m cp T ˙ [10,000 kg/(s m)][4200 J/(kg K)] T from which T 0.0015 K Ans. (g) The dissipation is large, but the temperature rise is negligible. 10.6 Gradually Varied Flow3 In practical channel flows both the bottom slope and the water depth change with position, as in Fig. 10.3. An approximate analysis is possible if the flow is gradually varied, e.g., if the slopes are small and changes not too sudden. The basic assumptions are 1. 2. 3. 4. 5. Slowly changing bottom slope Slowly changing water depth (no hydraulic ju...
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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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