Theory and Design for Mechanical Measurements
6th Edition
ISBN: 9781118881279
Author: Richard S. Figliola, Donald E. Beasley
Publisher: WILEY
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Chapter 10, Problem 10.25P
For Problem 10.24, suppose the air flow rate is 17 m /hr at 20 °C through a 6-cm-i.d. pipe, a square-edged orifice (p = 0.4) is used with flange taps, and the pressure drop can be measured to within 0.5% of reading for all pressures above 5 cm H2O using a manometer. If basic dimensions are maintained to within 0.1 mm, estimate a design-stage uncertainty in the flow rate. Use — 96.5 kPa abs, R = 287 N-m/kg-K.
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A Pitot tube is going to be used with an airflow at 32°C and 5 atm, and a velocity is 3 m/s:
a) What is the dynamic pressure (in Pa)?
b) What is the uncertainty of the velocity measurement if the dynamic pressure is measured with a manometer having an uncertainty of 3 Pa?
c)What is the relative uncertainty (in %) of the absolute uncertainty calculated in part b) with respect to the velocity measured?
Air with density of 1.225 kg/m^3 and viscosity of 1.789 x 10^-5 kg/m-s flows in a wind tunnel, the wind tunnel spped is measured with Pitot tube probe. For a certain run, the stagantion pressure is measured to be 472.6 Pa gage and the statric pressure is 15.43 Pa gage. Calculate the wind tunnel speed.
a.19. 3 m/s
b.18. 3 m/s
c.16.3 m/s
d.17. 3 m/s
PLEASE INCLUDE FIGURE OR FBD
Air with density of 1.225 kg/m^3 and viscosity of 1.789 x 10^-5 kg/m-s flows in a wind tunnel, the wind tunnel spped is measured with Pitot tube probe. For a certain run, the stagantion pressure is measured to be 472.6 Pa gage and the statric pressure is 15.43 Pa gage. Calculate the wind tunnel speed.
a.18. 3 m/s
b.16.3 m/s
c.17. 3 m/s
d.19. 3 m/s
Chapter 10 Solutions
Theory and Design for Mechanical Measurements
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