Conclusions
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1.
It has been shown that when measuring flow rates of incompressible liquids using standard diaphragms, considerable errors may arise due to the presence of gas in the liquid (even for small gas contents). In the experiments when measuring the flow rate of water aerated with a gas content of 5% by volume at the input to the diaphragm, the errors can be as much as 2.2% of the actual mass flow rate of the liquid phase.
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2.
The errors in measuring the flow rate which were observed for gas contents from 0.5 to 8.0% and ratios of the absolute pressure at the exit from the converging device to the absolute pressure at the entrance of greater than 0.8 have an upper limit set by the limit of the dependence obtained for the flow of a uniform mixture, and a lower limit set by the individual flow of liquid and gas phases ignoring compressibility.
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Literature cited
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Additional information
Translated from Izmeritel'naya Tekhnika, No. 9, pp. 52–54, September, 1978.
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Tarshish, M.S., Voronenkov, V.Y. Effect of the degree of aeration on the error of flowmeter converging devices. Meas Tech 21, 1248–1251 (1978). https://doi.org/10.1007/BF00822803
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DOI: https://doi.org/10.1007/BF00822803