Description of Problem 505: You are given the flow rate through an orifice plate flow meter and are asked to calculate the corresponding pressure drop.
Analysis of Problem 505: The relationship between pressure drop and flow rate for an orifice meter is a simple equation available in any Fluid Mechanics textbook. There is a solved example in the ME Review Manual by Lindeburg that is virtually the same as this problem.
Here is a problem we've crafted dealing with a venturi flow meter to test your understanding of the equations that apply to these flow metering devices.
Thermal and Fluid Systems Depth (PM) Exam Sample Problem #5
A venturi meter is installed in a 2-in diameter, schedule 40 steel pipe (ID = 2.067 in). The fluid in the pipe is ambient temperature No. 4 fuel oil with a specific gravity SG=0.85. The meter is provided with a U-tube manometer. From past experience with this meter, it is known that for a manometer fluid height, h, of 8 inches, the oil flow rate is 400 gallons per minute.
The average fluid velocity (ft/min) in the pipe just upstream of the meter when the height h=4 inches, is most nearly:
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