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DAVID W SPITZER'S E-ZINE (November 2020)


Vortex Shedding and Fluidic Flowemeters by David W Spitzer

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.

Part 4: Measuring Downward Flow: The Effects of Falling Liquid by David W Spitzer

Within the three situations that should be carefully considered: operation under vacuum, measuring downward liquid flow and gravity flow, we continue the discussion on measuring downward flow.

Steam Flow Measurement (Boiler Trip) by David W Spitzer

A vortex shedding flowmeter is used to measure steam flow leaving a boiler house. The flow measurement is relatively steady until a sudden electrical outage occurs and trips all of the boilers. The operators scramble and finally restart the boilers approximately 15 minutes later. How do you expect the steam flow measurement to react between the trip and the restart?


In addition to over 40 years of experience as an instrument user, consultant and expert witness, David W Spitzer has written over 10 books and 450 articles about flow measurement, level measurement, instrumentation and process control. David teaches his flow measurement seminars in both English and Portuguese.


Spitzer and Boyes, LLC provides engineering, technical writing, training seminars, strategic marketing consulting and expert witness services worldwide.


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