Theory and Design for Mechanical Measurements
6th Edition
ISBN: 9781118881279
Author: Richard S. Figliola, Donald E. Beasley
Publisher: WILEY
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Chapter 9, Problem 9.37P
A long cylinder is placed into a wind tunnel and aligned perpendicular to an oncoming freestream. Static wall pressure taps are located circumferentially about the centerline of the cylinder at 45-degree increments with 0 degrees at the impact (stagnation) position. Each tap is connected to a separate manometer referenced to atmosphere. A pitot-static tube indicates an upstream dynamic pressure of 20.3 cm H2O, which is used to determine the freestream velocity. The following static pressures are measured:
| Tap (degrees) |
p (cm H2O) | Tap (degrees) |
p (cm H2O) |
| 0 | 0.0 | 135 | 5.0 |
| 30 | 20.3 | 180 | 5.2 |
| 90 | 81.3 |
Compute the local velocities around the cylinder if the total pressure in the flow remains constant. Patm = 101-3 kPa abs, Tatm = 16 °C.
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The pressure drop (Ap) test is carried out using a pipe configuration as illustrated below:
Manometer 1
Manometer 2
straight pipe
D= 2R R= radius in pipe
The pipe data and the flowing fluid are as follows: Pipe: D = 1 cm; L= 100 cm.
Fluid: Water, with density (A) = 1000 kg/m"; absolute viscosity (u) = 0.001 kg/im.s);
Experimental data is shown as shown in the following table:
Task:
Ja. Plot the graph of the pressure as a function of the average velocity (V.v).
b. Based on the equation for laminar flow in the pipe as follows:
Ap = 32VuL,
Vavg (m/s) Ap (Pa)
0,001
0,002
0,005
0,01
0,02
0,04
0,06
0,08
0,1
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0,15
0,30
0,62
1,61
3,10
6,10
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20,10
26,00
32,50
38,90
47,20
D
Compare the experimental results in the table with the results of
calculations using the above equation. Leave a comment.
Note: Ap = p1-p2.
c. The coefficient of friction (f) in the pipe is formulated as follows:
f- 2DAD
PL(V.)
plot (plot) this distribution of fas a function of the Reynolds number (Re). Re is…
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Chapter 9 Solutions
Theory and Design for Mechanical Measurements
Ch. 9 - Prob. 9.1PCh. 9 - 9.2 State the following pressures as absolute...Ch. 9 - A water-filled manometer is used to measure the...Ch. 9 - Prob. 9.4PCh. 9 - 9.5 The pressure differential across an orifice...Ch. 9 - Show that the static sensitivity of an inclined...Ch. 9 - Prob. 9.7PCh. 9 - Show that the instrument (systematic) uncertainty...Ch. 9 - A strain gauge, diaphragm pressure transducer...Ch. 9 - Select a practical fluid to use in a manometer to...
Ch. 9 - An air pressure over the 200- to 400-N/m2 range is...Ch. 9 - Calculate the design-stage uncertainty in...Ch. 9 - The pressure drop across a valve through which air...Ch. 9 - Estimate the sensitivity (pF/mm) of a capacitance...Ch. 9 - A diaphragm pressure transducer is calibrated...Ch. 9 - A diaphragm pressure transducer is coupled with a...Ch. 9 - Prob. 9.17PCh. 9 - A 2.0 mm thick circular steel diaphragm (Em = 200...Ch. 9 - Estimate the differential pressure limit for a...Ch. 9 - The pressure fluctuations in a pipe filled with...Ch. 9 - What is the sensitivity of a pitot-static tube...Ch. 9 - A pitot-static pressure probe inserted within a...Ch. 9 - A tall pitot-static tube is mounted through and...Ch. 9 - The pressure transmission line response equation...Ch. 9 - Prob. 9.26PCh. 9 - Prob. 9.28PCh. 9 - Compare the inertance of water in a 0.2-m-long...Ch. 9 - The output from a resting healthy human adult...Ch. 9 - Prob. 9.31PCh. 9 - A pressure drop of 213 Pa is measured between two...Ch. 9 - Wall pressure taps (e.g., Figs. 9.19 and 9.21) are...Ch. 9 - Prob. 9.34PCh. 9 - Prob. 9.35PCh. 9 - Determine the resolution of a manometer required...Ch. 9 - A long cylinder is placed into a wind tunnel and...Ch. 9 - Prob. 9.38PCh. 9 - Prob. 9.39PCh. 9 - What is the sound pressure in pascals if the...Ch. 9 - A 6-mm-diameter pitot-static tube is used as a...Ch. 9 - For the thermal anemometer in Figures 9.31 and...Ch. 9 - Determine the static sensitivity of the output...Ch. 9 - A laser Doppler anemometer setup in a dual-beam...Ch. 9 - A set of 5,000 measurements of velocity at a point...Ch. 9 - Aircraft airspeed is measured using a pitot...
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