Simulation of pulsed neutron activation for determination of water flow in pipes

H. Mattsson; F. Owrang; A. Nordlund

doi:10.1515/kern-2002-0037

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Simulation of pulsed neutron activation for determination of water flow in pipes

H. Mattsson , F. Owrang and A. Nordlund

Published/Copyright: March 17, 2022

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From the journal Kerntechnik Volume 67 Issue 2-3

Abstract

The effect of the asymmetric distribution of activated water in PNA (pulsed neutron activation) measurements has been investigated experimentally by depositing a small amount of colour, simulating the activated water, in a transparent Plexiglas pipe. Based on the colour experiments, a semi-empirical model has been developed that describes the distribution of the activated water at different distances from the activation point. The model shows that the combination of inhomogeneous activation and a radial velocity profile makes the mean velocity of the activity lower than the mean velocity of the water. It can also be seen that the velocity of the activity increases as the distance from the activation point increases. The model has been compared with experimental values from PNA measurements and the measured mean velocity shows a similar dependence on the distance from the activation point.

Abstract

Die asymmetrische Verteilung von aktiviertem Wasser ist durch PNA-Messungen untersucht worden, indem man ein wenig Farbe, welches das aktivierte Wasser symbolisiert, in ein transparentes Plexiglasrohr gab. Basierend auf dem Farbexperiment, wurde ein semi-empirisches Modell entwickelt, um die Verteilung des aktivierten Wassers in verschiedenen Abständen zum Aktivierungspunkt zu beschreiben. Das Modell zeigt, dass die Kombination von inhomogenen Aktivitäten und einem radialen Geschwindigkeitsprofil die Durchschnittsgeschwindigkeit des aktivierten Wassers niedriger werden lässt, als die des nicht aktivierten Wassers. Es ist des Weiteren festzustellen, dass mit zunehmender Entfernung zum Aktivierungspunkt die Geschwindigkeit des aktivierten Wassers zunimmt. Das Modell wurde mit den Werten der PNA-Messungen im Experiment verglichen, wobei es sich zeigte, dass die gemessene Durchschnittsgeschwindigkeit ebenfalls vom Abstand zum Aktivierungspunkt abhängt.

Acknowledgement

This work was carried out with support from Göteborg Energi Forskningsstiftelse. L. Norberg and L. Urholm are acknowledged for their help with the experimental set-up and for running the accelerator.

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Received: 2002-01-31

Published Online: 2022-03-17

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https://doi.org/10.1515/kern-2002-0037