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- W2045974890 abstract "An NMR measurement method for highly-turbulent liquid-gas two-phase flow has been developed in this laboratory [Krüger, G.J., Haupt, J. and Weiss, R. A nuclear magnetic resonance method for the investigation of two-phase flow. In Measuring Techniques in Gas-Liquid Two-phase Flows (eds J.M. Delhaye and G. Cognet). Springer, Berlin, 1984, p. 435]. It allows measurement of the liquid velocity and of the fraction, both averaged over the inner volume of the NMR RF coil and over the measuring time. By signal-averaging, it is possible to extend the averaging time to mins, or even hrs or days. This time-averaging improves the signal relative to background noise as well as to fluctuations caused by the flow and hence improves the accuracy of the measurements. The influence of insufficient mixing of the spins during the polarization period is discussed.Measurements with this method have been executed in turbulent water flow and in water-nitrogen two-phase flow. The calibration procedure for the velocity vNMR and liquid fraction ϵNMR is done with turbulent water all-liquid flow. The velocities ranged from 0.1 to 5 m/s and the liquid fraction from ca 0.5 to 1.0. The mass flow MFNMR in two-phase flow, which is proportional to the product vNMR times ϵNMR, indicates an accuracy of better than /t+-5%." @default.
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- W2045974890 date "1980-08-01" @default.
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- W2045974890 title "Influence of transverse intraphase velocity profiles and phase fraction distributions on the character of two-phase flow equations" @default.
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- W2045974890 doi "https://doi.org/10.1016/0017-9310(80)90182-9" @default.
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