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 9.33P
Wall pressure taps (e.g., Figs. 9.19 and 9.21) are often used to sense surface pressure and are connected to transducers by connecting tubing. Two race engineers discuss the preferred diameter of the tubing to measure pressure changes on the surface of a car as it moves along a track. The tubing length may be up to 2 m. Engineer A suggests very small 2-mm-diameter tubing to reduce air volume so as to increase response time. Engineer B disagrees and suggests 5-mm tubing to balance air friction with air volume to increase response time. Offer your opinion and its basis. (Hint: Look at length-to-diameter effects.)
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1. A capillary tube is being used to measure the viscosity of a Newtonian liquid. The tube has a 4-cm diameter and a length of 20 cm. Estimate the viscosity coefficient for the liquid if a pressure of 2.5 kPa is required to maintain a flow rate of 1 kg/s. The liquid density is 998 kg/m3
2. Calculate the viscosity of a fluid that would allow a pressure drop of 35 kPa over a 5 – m length of 3.4 in. stainless steel sanitary pipe if the fluid is flowing at 0.12 m3/hr and has a density of 1010 kg/m3. Assume laminar flow.
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Q.1
A simple and accurate viscometer can be
made from a length of capillary tubing.
If the flow rate and pressure drop are
measured, and the tube geometry is known,
the viscosity of Newtonian liquid can be
computed. A test of a certain liquid in a
capillary viscometer gave the following
data:
Flow rate: 880 mm /s, Tube length: 1 m,
,3,
Tube diameter: 0.50 mm, Pressure drop: 1.0
MPа
The viscosity of liquid will be (pig =999 kg/m:),
assuming the flow to be laminar.
A
0.37x10*Ns/m
В
3.7x10* Ns/m
1.74x10* Ns/m
C
1.74x10* Ns/m
A viscous liquid is tested using a cone-and-plate rheometer that has a radius
of 60 mm and cone angle of 2.5° for which the following data are obtained:
Speed (rpm)
Torque (Nm) 0.022 0.036 0.055 0.067 0.077 0.086 0.093 0.098 0.102
7.5
15
30
45
60
75
90
105
120
Evaluate the type and properties of the non-Newtonian fluid being tested.
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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