ECEN 5053-003 Homework Assignment Course Name: Embedding Sensors and ActuatorsCorresponding Module: C1M3 Week Number: 3Module Name: Flow Sensors Note: Correct answer is in Blue Font Homework is worth 100 points. Each question is worth 10 points. A. You want to measure the flow rate of air of density 1.225 kg/m3 in a differential pressure meter. The upstream pressure is 20 N / m2 and
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ECEN 5053-003 Homework Assignment
Course Name: Embedding Sensors and Actuators
Corresponding Module: C1M3
Week Number: 3
Module Name: Flow Sensors
Note: Correct answer is in Blue Font
Homework is worth 100 points. Each question is worth 10 points.
A. You want to measure the flow rate of air of density 1.225 kg/m3 in a differential pressure meter. The upstream pressure is 20 N / m2 and the downstream pressure is 15 N / m2. The meter has an area of 0.1 m2. What is the flow rate in m3 / sec?
B. What advantage does a coriolis meter have over a thermal mass flow meter when measuring the mass flow rate of a gas?
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C. A You want to measure the flow rate of a gas at roughly 400°C, 15 Bar static pressure, and 150 m/s flow velocity. Which is the only type of flow meter, from the 7 types that we discussed in class, that you can use and why?
D. What are three differences in the method and principal of operation between a variable area meter and a differential flow pressure meter? (note: this question is not asking about the specifications of the meters)
E. The k-factor for a turbine meter for flow in a 1.5” (38.1 mm) diameter pipe is 110 pulses per liter. Your magnetic pickup assembly recorded a frequency of 150 Hz. What is the flow rate Q in liters per minute?
F. A coriolis flow meter has a liquid flow accuracy of 0.25% of flow rate and a zero stability of 3.5 kg / hr. What is the maximum error in kg /hr in the flow rate reading when the meter measures a flow rate of 2500 kg / hr?
G. What are three differences in the pattern of fluid flow between laminar flow and turbulent flow?
H. How is a vortex created in the middle of pipe when using a vortex meter? How does the vortex meter measure the flow rate?
I. A variable area flowmeter is used to measure the flow of ethylene glycol. The float is a spherical piece of glass. The flowmeter has the following dimensions and properties:
I-1) What is the force due to gravity on the float?
I-2) What is the buoyancy force on the float?
I-3) What is the flow resistance force on the float?
I-4) Which direction does the float move, up or down, and why?
I-5) What new value of the resistance coefficient must be established at the flow velocity for the float to reach an equilibrium position?
J. What are the major advantages of the coriolis flow meter relative to the other 6 flow meters we studied in this chapter? How does this advantage show up in the types of fluids it is used to measure? What is one disadvantage of the coriolis meter?
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