Abstract
A quantitative evaluation on thermal striping, in which temperature fluctuation due to convective mixing causes high cycle thermal fatigue in structural components, is of importance for reactor integrity. In this study, we performed a parallel triple-jet water experiment along a wall. The material of the wall was changed to acrylic resin, stainless steel and copper in order to evaluate an effect of thermal properties of the wall on the transfer characteristics of temperature fluctuation from fluid to structure. The temperature fluctuation intensity in structure was small as the thermal diffusivity of the wall material was large. Heat transfer coefficient was obtained from the transfer function between temperature fluctuations in fluid and wall. It was seen that the heat transfer coefficient was large as the thermal diffusivity of material was large. Furthermore, the dependence of Nusselt number on Reynolds number was close to the existing correlation.
