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DAVID W SPITZER'S E-ZINE (February 2023)


Vortex Shedding and Fluidic Flowmeter Applications (Part 2 of 4) by David W Spitzer and Walt Boyes

Vortex shedding and fluidic flowmeters can be used to measure the mass flow of gases and vapors. These flowmeters measure the fluid velocity that is used to infer the mass flow in conjunction with other measurements, such as pressure and temperature. Because the density of gases and vapors is usually significantly lower than that of liquids, the ability to generate sufficient hydraulic energy to operate the sensing system can be limited. Therefore, vortex shedding and fluidic flowmeters in gas and vapor applications generally have higher turn off velocities, so they may not measure when the flowing stream is at low velocity, at low pressure, or at high temperature.

The More Experts, The Better by David W Spitzer

Previous articles described the sewage collection systems for two adjacent sewage districts where the flow measurements used to allocate expenses and bill one of the sewage districts flowmeters was questioned in court.

In general, companies hire experts to investigate what happened, explain what occurred to the company, explain why a particular party is at fault and provide expert testimony in court - all in terms that can be easily understood by a lay person.

Good experts are not inexpensive (double negative) so companies tend to hire as few experts as possible (usually one) on a given case and trust that that expert can address all aspects of the case.

Calculating Fill Time for a Tank by David W Spitzer

A chemical intermediate with a specific gravity of 1.00 will be diverted to an empty flat-bottom tank with a diameter of 6 feet that is 12 feet high at a flow of 4 gallons per minute. Approximately how long will it take to fill the tank?


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 500 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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