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DAVID W SPITZER'S E-ZINE (February 2024)


Ultrasonic Flowmeter Applications (Part 2 of 2) by David W Spitzer and Walt Boyes

Straight run requirements for ultrasonic flowmeters are not excessive, so this technology can be applied where limited straight run is available. Applications where the velocity profile changes with the flow rate can cause erratic operation of some ultrasonic flowmeters. Some ultrasonic flowmeters have Reynolds number constraints, so they are generally not applied in applications where the liquid exhibits a relatively high viscosity. Other designs correct for Reynolds number, however their performance is usually degraded in the transitional flow regime. Ultrasonic flowmeters generally exhibit their best performance in the laminar and turbulent flow regimes.


What Do We 'Know'? Revelations in Flowmeter Straight Run Effects by David W Spitzer

Sometimes we 'know' things that are not true.  For example, we used to 'know' that the earth was flat.  Columbus 'knew' that he could sail eastward to reach the Far East but did not 'know' that a few continents would block his quest.  During the last few centuries, we 'knew' that the Earth was round but could only see it courtesy of some wonderful Apollo Mission pictures from NASA only forty years ago.  Such is the case of what we 'know' about straight run requirements for flowmeters in relatively large pipes.


Know Flow with No Flowmeter by David W Spitzer

There are times when there is no flowmeter installed but it is necessary to determine the flow through a pipe.  What techniques can be used to determine the flow?



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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