Unformatted text preview: 10.113
P10.114 Investigate the possibility of choking in the venturi flume
of Fig. P10.113. Let b1 4 ft, b2 3 ft, and y1 2 ft.
Compute the values of y2 and V1 for a flow rate of (a)
30 ft3/s and (b) 35 ft3/s. Explain your vexation.
P10.115 Gradually varied theory, Eq. (10.49), neglects the effect
of width changes, db/dx, assuming that they are small.
But they are not small for a short, sharp contraction such
as the venturi flume in Fig. P10.113. Show that, for a rectangular section with b b(x), Eq. (10.49) should be
modified as follows:
dy
dx S0 Textbook Table of Contents [V2/(gb)](db/dx)
1 Fr2 S  Study Guide Problems 705
Investigate a criterion for reducing this relation to Eq.
(10.49).
P10.116 Investigate the possibility of frictional effects in the venturi
flume of Prob. 10.113, part (a), for which the frictionless
solution is Q 9.88 m3/s. Let the contraction be 3 m long
and the measurements of y1 and y2 be at positions 3 m upstream and 3 m downstream of the contraction, respectively.
Use the modified gradually varied...
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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.
 Spring '08
 Sakar

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