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Background, Scope and Objectives of the Workshop

• Significant advances have been accomplished in the instrumentation for two-phase flow since the OECD/CSNI Specialists Meeting on Advanced Instrumentation and Measurement Techniques held in Santa-Barbara, California, US, on March 17-20, 1997. Then the idea of organizing a new international workshop on instrumentation and measurement techniques emerged during previous SILENCE meetings. It is consistent with both the “vision” and the “mission” of SILENCE Network, which promotes and fosters the establishment of a common ground for cooperation and discussion on thermal-hydraulic experiments, and wants to promote new experiments, including improvements of the existing measurement techniques.
• The purpose of this Specialists Workshop on Advanced Instrumentation and Measurement Techniques for Nuclear Reactor Thermal Hydraulics is to bring together international experts on instrumentation, experiments and modelling in order to:
  • review the recent instrumentation and experiment techniques developments;
  • identify the specific experimental needs that arose from the development of modern simulation tools including system codes, component codes, and computational multi-fluid dynamics (CMFD) codes provided with advanced models such as dynamic interfacial area modelling, poly-dispersion modelling of bubbly and droplet flow, multi-field models and two-phase turbulence models;
  • discuss future directions for instrumentation developments, modelling and experiments.
• The subject is wide and complex and deserves “dedicated” discussion; therefore, specialized workshops such as the present one would be complementary to other events on code development and verification and validation (V&V) and initiatives in which the experimental area is not covered with sufficient detail and focus.
• The following topics are included in the Workshop:
  • modelling needs for closure relations in current and advanced 1D models and in 3D models for either porous medium or open medium approaches;
  • local instrumentation for void fraction, interfacial area, bubble and droplet size, phase velocities, turbulence scales, mean and fluctuating temperature field, mean and fluctuating pressure, non-condensable gas fraction, wall friction, wall heat flux (this may include optical probes, conductivity or capacity probes, film probes, Wire Mesh Sensors, hot wire or hot film anemometry, steady and transient X-ray or Gamma tomography, absorption and scattering methods, Laser Doppler Anemometry, Particle Tracking Velocimetry, Laser Induced Fluorescence, Nuclear Magnetic Resonance, ultrasonic methods, and any other new advanced method);
  • visualization techniques, expert systems, identification of flow regimes in complex geometry (rod bundle, tube bundle, etc.) and/or in high pressure and high temperature conditions;
  • use of simulant fluids with well-established similarity laws;
  • any new experimental technique;
  • industrially applicable instrumentation.
• The Workshop will also address quality- and qualification-related aspects, such as:
  • current code validation requirements;
  • test design requirements for code validation (e.g. pressure losses, scaling issues, etc.);
  • specific requirements for CMFD-grade experiments and related measurements for single- and multi-phase flows;
  • criteria for quality of data (e.g. measurement uncertainty assessment);
  • experimental data handling issues.
• The Workshop should help to identify the current gaps between the (modelling and code qualification) needs and the available technology, and the margins for future advancements.