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DAVID W. SPITZER'S E-ZINE
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TECHNICAL AND MARKETING SERVICES FOR INSTRUMENTATION SUPPLIERS AND END-USERS
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Vortex shedding and other fluidic effects are oscillations that occur when
fluids pass by an object or obstruction. Examples of these effects in nature
include the whistling caused by wind blowing by the branches of trees, the
swirls produced downstream of a rock in a rapidly flowing river, and the
waving of a flag the wind. Note that in all of these examples, when the
flow is slowed, the phenomenon ceases. That is, the whistling stops when
the wind dies down, the water flows calmly around the rock when the river
is not flowing rapidly, and the flag does not wave in a mild breeze.
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Flowmeters should be installed, operated, and maintained properly to achieve
optimal performance. Failure to do so can result in significant complications.
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The debate over repeatability and accuracy of flow measurement
seems to replay itself every so often. I admit having an opinion,
but there are valid arguments on both sides that should be heard.
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ISSN 1538-5280 ©2006 Spitzer and Boyes, LLC
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