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Title: Using Cavitation Metrologically
Author: Daniel Schumann Corinna Kroner
Source: 2018 International Symposium on Fluid Flow Measurement
Year Published: 2018
Abstract: Cavitation is a commonly known phenomenon in the world of fluid mechanics, mostly associated with negative impact. A novel application of cavitation is as a flow meter. PTBs Department Liquid Flow started research with so-called cavitating nozzles, because of longterm excellent experience with critical nozzles in the area of gas flow measurements. The first prototype of a cavitating nozzle was close to the corresponding ISO standard 9300 for gas measurements. Using a dedicated prototype of a test rig the nozzle was tested under different conditions e. g. different fluid temperatures and operating pressures. First tests show a remarkable flow stability of 0.003 %. In a cooperation with the University of Duisburg-Essen the nozzle geometry was numerically analyzed and optimized for liquid flow. Furthermore, first experiments demonstrate the capability to generate a rapid change of flow rates, e. g. an increase from 0.001 m/h to 5 m/h within one second, by switching multiple nozzles on and off. The generation of rapidly varying flow profiles is one important potential application of cavitating nozzles as water meters or fuel meters could then be tested and evaluated under realistic flow profiles which is not possible so far. Cavitating nozzles could thus pave the way towards test procedures which are as close as possible to real-world conditions in fluid flow measurements

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