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Wire Mesh Sensor for High Temperature High Pressure Applications

Type of publication Peer-reviewed
Publikationsform Proceedings (peer-reviewed)
Author Kickhofel John, Prasser Horst-Michael, Selvam Karthick, Laurien Eckart, Huber Hermann,
Project Temperature Fluctuations in Fluid and Pipe Walls induced by Turbulent Mixing
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Proceedings (peer-reviewed)

Title of proceedings 16th International Topical Meeting on Nuclear Reactor Thermalhydraulics (NURETH-16)
Place Chicago, USA

Abstract

State-of-the-art turbulence models are expected to accurately predict flow behavior in a wide range of geometries and flow conditions for a wide range of fluid properties. The validation and improvement of these models relies on accurate time resolved experimental measurements of scalar and vector flow variables. One such measurement technique for obtaining a high density of flow data with high time resolution is electrode mesh tomography in the form of wire mesh sensors (WMS). Extensive studies on single and multiphase flows have been successfully carried out with WMS technology in the past 15 years, often focused on flows directly related to nuclear power generation. Nearly all of these experiments have taken place at low temperatures (< 100 ºC) and pressures. A new WMS construction has been designed for operation in high temperature and pressure steam and water environments similar to those found in commercial light water reactors. The sensor package is compatible with standard flanged steel pipelines by implementing a novel electrode design and sealing methodology, while relying on the traditional WMS electronics which processes current signals from the receiver wires simultaneously at up to 10 kHz. Furthermore, the design allows for a scaling of the sensor not only in terms of electrode pitch but the possibility to include a third sensor layer or a second in-line WMS for velocity measurements based on cross-correlations. We describe in detail a prototype sensor of 16 x 16 electrodes compatible with DN80 PN100 flanges and exhibit sensor commissioning data from mixing experiments the University of Stuttgart high temperature high pressure fluid-structure interaction T-junction facility. Specifically, flow patterns in the main pipe of the T-junction due to upstream flow of cold branch line fluid are measured using the new WMS.
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