Thermal striping is a phenomenon that the temperature constantly changes of the fluid and the contact solid structure, due to the mixing of fluids with different temperatures. When thermal striping occurs above the core of a nuclear reactor, it usually leads to fatigue failure of the solid structure near the center column. Existing research mainly focuses on the mixing phenomenon of different temperature fluids and temperature fluctuations in fluid by using CFD simulations. However, the experimental study on the temperature fluctuation characteristics of the surface and interior of the structure is limited. In this study, a thermal striping experiment setup based on coaxial jet is design and built. The temperature of the plate structure surface and interior was measured when cold and hot fluids were mixed in coaxial jet. The temperature distribution and fluctuation characteristics associated with thermal striping phenomena was analyzed.
Keywords thermal striping, temperature response, coaxial jet, temperature fluctuation