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Leandro C. Luiz,Francisco J.O. Ferreira,Verginia R. Crispim 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.4
The presence of crust on the inner walls of metallic ducts impairs transportation becausecrust completely or partially hinders the passage of fluid to the processing unit and causesdamage to equipment connected to the production line. Its localization is crucial. With thedevelopment of the electronic imaging system installed at the Argonauta/Nuclear EngineeringInstitute (IEN)/National Nuclear Energy Commission (CNEN) reactor, it becamepossible to visualize crust in the interior of metallic piping of small diameter using realtimeneutron radiography images obtained with a low neutron flux. The obtained imagesshowed the resistance offered by crust on the passage of water inside the pipe. Nodiscrepancy of the flow profile at the bottom of the pipe, before the crust region, wasregistered. However, after the passage of liquid through the pipe, images of the disturbancesof the flow were clear and discrepancies in the flow profile were steep. This showsthat this technique added the assembled apparatus was efficient for the visualization ofthe crust and of the two-phase flows.