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flow imbalance in MHD flows in splitting ducts with locally different electric conductivities of the walls

Journal of Hydrodynamics 2018年第5期30卷 920-927页

作者： Yang Luo Mengqi Zhu C.N.Kim Department of Mechanical Engineering Graduate School Kyung Hee University Department of Mechanical Engineering College of Engineering Kyung Hee University

In this study, three-dimensional liquid-metal magnetohydrodynamic splitting flows in a duct with one inflow channel and two outflow channels with locally different wall electric conductivities（different conductance ratios） are computationally examined. The numerical calculation is achieved with the use of CFX code, with a structured grid system chosen after a series of mesh independence tests. The detailed features of the MHD flows are depicted in a case where the electric conductivities of the two outflow ducts are quite different. Also, the interdependency among the current, fluid velocity, pressure and electric potential is elucidated in order to describe the electromagnetic characteristics of the liquid-metal flows. The result shows that the imbalance of the mass flow rate in the two outflow channels strongly depends on the wall conductivity（i.e., conductance ratio） of each outflow channel.

关键词： liquid metal flow splitting duct flow imbalance numerical examination conductance ratio

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Revealing liquid metal Target Malfunctions by Means of Vibrations and Sound Pressure Monitoring

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Journal of Iron and Steel Research(International) 2012年第S1期19卷 608-612页

作者： S.B.Dementjev R.Z.Milenkovic M.Wohlmuther F.Barbagallo E.Manfrin Paul Scherrer Institut Villigen PSI 5232Switzerland

In the following paper an experiment dedicated to the accident protection system of a liquid metal Target is presented.The test was carried out at the liquid metal test stand(LIMETS)at PSI in which the malfunctioning of a target during operation was simulated.It could be demonstrated that measurements and the proper(on-line)analysis of target vibrations and surrounding sound pressure fields allow the detection of a malfunctions like deformation or detaching of structural elements immeresed in the flow.Amplitudes of acceleration sensors and microphones signals as well as frequencies of the disturbances' signals are prospective parameters to be used in an automated accident protection system as indicators for a target malfunction.

关键词： spallation neutron sources target liquid metal flow heat transfer accident protection system beam entrance window

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