Funding Projects

SCK.CEN Grant - Tommaso Carlesi
Développement d’une technique de mesure des flux de chaleur turbulents dans les métaux liquides.

01/01/2021-31/12/2024 - 2 partners
  • Funding agency: SCK.CEN

  • Coordinator(s):

  • Department Contribution:

  • Administrative responsible(s): P. Mégret; M. Mura;

  • Scientific responsible(s): P. Mégret; T. Carlesi;

  • Summary of the project: Turbulent heat fluxes are an important factor in the determination of primary coolant temperatures in a nuclear reactor. Measurement of these fluxes is challenging as it requires simultaneous measurement of velocity and temperature fluctuations in a particular environment. This PhD thesis aims at developing high-fidelity instruments to acquire simultaneous measurement of velocity and temperature in liquid metals. MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) is a flexible fast-spectrum research reactor under design at SCK CEN, the Belgian Nuclear Research Centre. MYRRHA is a pool-type reactor with Lead Bismuth Eutectic (LBE) as the primary coolant. For the design and safety evaluation of MYRRHA, the temperature of the primary coolant must be assessed for nominal operation as well as in accidental conditions. The instruments developed in this PhD will provide unique information on the turbulent heat flux and will quantify the turbulent thermal diffusivity, which is a fundamental term in the modeling of turbulent heat transfer in natural and forced convection. Nowadays, techniques for the measurement of temperatures and velocities in opaque fluids like LBE allow to acquire data with good accuracy but with a limited spatial and/or temporal resolution. Moreover, no technique is currently available for the simultaneous measurement of these two quantities and for application in a liquid metal environment (high temperatures, chemical corrosion…). State- of-the-art techniques such as hot-wire anemometry and Ultrasonic Doppler Velocimetry for velocity and optical fiber temperature sensors will be developed for application in a low melting point liquid metal at the Von Karman Institute for Fluid Dynamics during the first two years of the project. During the last two years, the selected technique will be applied for turbulent heat flux measurements in an LBE facility at SCK CEN with the final purpose of supporting the design of the MYRRHA reactor.