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Unformatted text preview: Extensive discussions of laser velocimetry are given in Refs. 38
and 39.
EXAMPLE 6.20
The pitotstatic tube of Fig. 6.30 uses mercury as a manometer fluid. When it is placed in a water flow, the manometer height reading is h 8.4 in. Neglecting yaw and other errors, what is
the flow velocity V in ft/s? Solution
From the twofluid manometer relation (2.33), with zA
h by
p0 ps ( M z2, the pressure difference is related to
w)h Taking the specific weights of mercury and water from Table 2.1, we have
8.4
p0 ps (846 62.4 lbf/ft3)
ft 549 lbf/ft2
12
The density of water is 62.4/32.2 1.94 slugs/ft3. Introducing these values into the pitotstatic
formula (6.117), we obtain  v v 390  eText Main Menu  Textbook Table of Contents  Study Guide 6.10 Fluid Meters
2(549 lbf/ft2) 1/2
23.8 ft/s
1.94 slugs/ft3
Since this is a lowspeed flow, no compressibility correction is needed.
V VolumeFlow Measurements 391 Ans. It is often desirable to measure the integrated mass, or volume flow, passing through
a duct. Accurate measurement of flow is vital in billing customers for a given amount
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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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